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Film bulk acoustic wave resonator and preparation method thereof
InactiveCN101465628AHigh application frequencyReduce the requirements of the manufacturing process for equipmentImpedence networksThin-film bulk acoustic resonatorBulk acoustic wave
The invention discloses a thin film bulk acoustic wave resonator which comprises a substrate, a buffer layer, a piezoelectric layer and electrodes, and is characterized in that 1. A smooth concave groove and the buffer layer are arranged on the upper end surface of the substrate; the buffer layer crosses the concave groove and forms an air gap provided with a smooth upper convex edge with the substrate, and completely covers the air gap; the height of the lower top surface of the air gap is less than that of the substrate, and the air gap has flat surface and even change edge; 2. The edge of the buffer layer, which is contacted with the air gap and is close to the substrate is in smooth and outer-convex shape; the piezoelectric layer is arranged on the buffer layer; the electrodes include a bottom electrode and a top electrode; the bottom electrode is arranged in the piezoelectric layer on the buffer layer; the top electrode is arranged on the piezoelectric layer. The thin film bulk acoustic wave resonator has ingenious structure; a FBAR with stable structure and low loss can be fabricated on the substrate through the method, and the CMP process is avoided, so the thin film bulk acoustic wave resonator can be integrated into a CMOS chip conveniently.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Modular multi-level multi-terminal flexible direct current system direct current fault handling method
ActiveCN103066573ATroubleshooting method is simple and easyReliable methodEmergency protective circuit arrangementsModularityFault handling
The invention provides a modular multi-level multi-terminal flexible direct current system direct current fault handling method which comprises the following steps that (1) a relay protection device detects a multi-terminal flexible direct current system in real time, if a direct current fault point is detected, breakers at two ends of a direct current line are switched off, and converters of stations are kept in a running state; (2) the switched-off breakers are switched on, whether the fault disappears is detected, if the fault does not disappear, the breakers are switched off again, and if the fault disappears, a step (3) is carried out; (3) the direct current line is used, and the system runs normally. The modular multi-level multi-terminal flexible direct current system direct current fault handling method is simple, easy to implement and reliable, influences on a plurality of converter stations of temporary direct current faults are reduced, timely recovery and running of the system after the temporary direct current faults are removed are guaranteed effectively, and device running safety is guaranteed at the same time.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
Improved fuel delivery system
InactiveCN1675457ANo need to increase the quantityAchieve substantial improvementsTurbine/propulsion fuel valvesGas turbine plantsClosed loopEngineering
A fuel delivery system provides for closed loop mass flow control of fuel between a metering valve and a pump, such as a variable delivery pump. Changes in pressure across the metering valve are monitored and pump operation is altered in response thereto. A thermal controller monitors fuel temperature and recirculates a portion of the fuel flow through a heat exchanger. The fuel delivery system can be provided as original equipment or as a retrofit.
Owner:ARGO TECH CORP
Stacking and splitting quick detection method and device
ActiveCN102916857ASave bandwidth resources and CPU resourcesEasy to detectData switching networksAddress resolutionLocal area network
Owner:MAIPU COMM TECH CO LTD
Intelligent floor sweeping robot system
InactiveCN107198497AWithout adding complexityLower unit costAutomatic obstacle detectionTravelling automatic controlVideo monitoringRobotic systems
The invention discloses an intelligent floor sweeping robot system which comprises a floor sweeping robot module, a server and a terminal. The floor sweeping robot module comprises a processor which is connected with a dust mite monitoring module, a sweeping power module, a sensor module, an ultrasonic detection module, a positioning system, a video monitoring module, a traveling module and a communication module, and the server is used for information interaction between the floor sweeping robot module and the corresponding terminal and processing information transmitted by the terminal and the floor sweeping robot module. The intelligent floor sweeping robot system correlates a floor sweeping robot with the terminal without excessively increasing structural complexity and cost of the floor sweeping robot, transmits the information between the corresponding terminal and the floor sweeping robot and is convenient and quick.
Owner:HEFEI KANGZHIHENG MACHINERY TECH CO LTD
Apparatus and method for encoding and decoding label information of channel quality
InactiveCN1471254AWithout adding complexityImplement channel codingError prevention/detection by using return channelPower managementCommunications systemControl channel
A method for transmitting pilot bits instead of partial bits of CQI (Channel Quality Indicator) information indicating channel quality of an HS-PDSCH (High Speed-Physical Downlink Shared CHannel) in a CDMA (Code Division Multiple Access) communication system such that a Node B can control power of a high-speed uplink control channel. The system transmits high-speed packet data from the Node-B to UE (User Equipment) through the HS-PDSCH, and the UE is located in a handover area between the Node-B and another Node-B adjacent thereto. Predetermined bits are then removed from given bits of the code symbols. The removed bits are then replaced with high-speed pilot bits for power control.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and system for wireless access controller concentrating identification under local transmitting mode
InactiveCN103167493AEnsure safetyWithout adding complexitySecurity arrangementAuthentication serverCAPWAP
The invention discloses a method and a system for wireless access controller concentrating identification under a local transmitting mode. The method comprises that an AP packages an expanding identification protocol message received from an STA into a CAPWAP message which is then sent to an AC; after the AC receives the CAPWAP message from the AP, the expanding identification protocol message is resolved from the CAPWAP message and is converted to an RADIUS message to be sent to an identification server, the RADIUS message returned by the identification server is converted into the expanding identification protocol message and is packaged into the CAPWAP message and then is sent to the AP; after the AP receives the CAPWAP message form the AC, the expanding identification protocol message is resolved from the CAPWAP message and is sent to the STA. Under the local transmitting mode, even if the AC and the AP crosses three layers of network organizations, the AC can still be an authenticator to complete 802.1 X identification, safety of wireless local area networks is guaranteed, and complexity of a bearing network does not need to be increased.
Owner:ZTE CORP
Signal processing method for eliminating static clutter interference of FMCW radar
ActiveCN107607924AEliminate the effects ofImprove extraction accuracyWave based measurement systemsPhase angleTime sequence
The invention provides a signal processing method for eliminating static clutter interference of FMCW radar. The method comprises the following steps: step one, estimating amplitude a-hat of base-bandcomposite beat signals during each frequency sweep period; step two, obtaining a discrete point (R[i], I[i]) sequence on a complex plane on the basis of an estimated amplitude time sequence and a known initial phase time sequence; step three, performing circle center estimation fitting on the discrete point (R[i], I[i]) sequence on the complex plane; step four, performing correction compensationon offset of the circle center, and obtaining a corrected Ru[i] and a corrected Iu[i]; and step five, taking a phase angle of a complex discrete point (Ru[i], Iu[i]) sequence, and obtaining a corresponding phase time sequence. Correction compensation is conducted on the estimated phase time sequence on the basis of signal post-processing, so interference of static clutter in vibration monitoring of target object can be eliminated effectively and the extraction precision of vibration displacement amplitude can be improved.
Owner:SHANGHAI JIAO TONG UNIV
Glass fiber reinforcement PP material with low VOC and preparation method of glass fiber reinforcement PP material
The invention provides a glass fiber reinforcement PP material with low VOC and a preparation method of the glass fiber reinforcement PP material. A pp material is adopted as a base material, by adding extracting agent master batch, on the premise of not changing equipment, VOC is removed from the interior of the material rather than being absorbed by a porous material or remaining in the material by virtue of the blocking of a deodorizing agent, and the method has good effect for reducing the VOC; moreover, the complexity of the processing technology is not increased; less extracting agent master batch is used, and by adding 1.5 to 3.5 parts by weight of extracting agent master batch, the requirement of people on PV3900 and PV3341 can be met; by adding a grafting agent, an antioxidant and glass fibers, mechanical properties of the PP material are improved, the tensile strength is 94MPa or higher, the elongation at break is 3.1 percent or higher, the bending modulus is 7800MPa or higher, a melt index is 3.4 g / 10min or higher, and the impact strength is 10.5KJ / m<2> or higher.
Owner:柏力开米复合塑料(昆山)有限公司
Video switching method and device
ActiveCN106878807ASimple processSwitching Accurate and FlexibleSelective content distributionVideo playerComputer graphics (images)
The invention provides a video switching method which is applied to a mobile terminal. The video switching method comprises the steps that metadata are inserted into at least one transport stream data of a first video, wherein the metadata include instruction information; and when a first video player plays back the first video, if the metadata are called back at any time, a second video player is switched to play back a second video. The embodiment of the invention further provides a video switching device. According to the invention, the metadata including the instruction information are inserted into the transport stream data of the video; during the video playback, when the metadata are called back, the video can be switched according to the instruction information in the metadata; switching between videos is accurate and flexible; less resources are occupied; and the user experience is enhanced.
Owner:BEIJING QIYI CENTURY SCI & TECH CO LTD
Nonlinear error correction method for optical fiber Michelson interference vibration meter
PendingCN110702210AGood effectHigh precisionSubsonic/sonic/ultrasonic wave measurementUsing optical meansVibration measurementLight beam
The invention relates to a nonlinear error correction method for an optical fiber Michelson interference vibration meter, and belongs to the technical field of optical fiber interference measurement.According to the invention, in the premise that positions of a first reflector and a second reflector do not need to be changed, by carrying out wavelength pre-scanning on a laser wavelength modulatable light source and utilizing a continuous change of an output laser wavelength to enable an optical path difference between a reference beam and a measurement beam of an interferometer to generate acontinuous change, an interference signal obtained by a detector generates at least one period of phase change and pre-extraction of characteristic parameters of the interference signal is implemented; and nonlinear error correction is implemented in the measuring process by utilizing the pre-extracted characteristic parameters, and high-accuracy vibration measurement is carried out. The nonlinearerror correction method for the optical fiber Michelson interference vibration meter, which is disclosed by the invention, implements pre-extraction on the characteristic parameters of the interference signal of the optical fiber Michelson interference vibration meter, can effectively solve a problem of correcting a nonlinear error in the interference measurement and particularly in the micro vibration measurement, and has the obvious technical advantages in the field of precision measurement.
Owner:HARBIN INST OF TECH
Method for monitoring quality of link between HNB (Home Node Base station) and HNB GW (Home Node Gateway) as well as system thereof
ActiveCN101841841AAccurately determineWithout adding complexityData switching networksWireless communicationFemtocellMonitoring methods
The invention discloses a method for monitoring quality of a link between a HNB (Home Node Base Station) and a HNB GW (Home Node Gateway) as well as a system thereof, aiming to solve the problem that the quality of the link can not be effectively monitored. In the method for monitoring the quality of the link, a home node base station management server (HMS) counts and reports a first parameter value of the quality information of the link at the HNB side of the link to be monitored; meanwhile, the home node base station gateway management server (HGWMS) counts and reports a second parameter value of the quality information of the same link at the HNB GW side of the chain to be monitored; a link quality monitoring device compares the first parameter value and the second parameter value of the received link quality and determines the quality of the link between the HNB and the HNB GW. The effective monitoring for the quality of the link between HNB and the HNB GW is realized, so that the invention can accurately determine that the generation reason of the network problem between HNB and the HNB GW is the link fault.
Owner:CHINA MOBILE COMM GRP CO LTD
End cap voltage control of ion traps
InactiveCN101971290AWithout adding complexityNo additional costMass spectrometersCapacitanceExcitation signal
An ion trap for a mass spectrometer has a conductive central electrode with an aperture extending from a first open end to a second open end. A conductive first electrode end cap is disposed proximate to the first open end thereby forming a first intrinsic capacitance between the first end cap and the central electrode. A conductive second electrode end cap is disposed proximate to the second open end thereby forming a second intrinsic capacitance between the second end cap and the central electrode. A first circuit couples the second end cap to a reference potential. A signal source generating an AC trap signal is coupled to the central electrode. An excitation signal is impressed on the second end cap in response to a voltage division of the trap signal by the first intrinsic capacitance and the first circuit.
Owner:1ST DETECT CORP
Improved fuel delivery system
InactiveCN100507240CIdeal temperature dataNo need to increase the quantityTurbine/propulsion fuel valvesGas turbine plantsClosed loopDelivery system
The present invention provides a fuel delivery system with closed loop mass flow control between metering valve (250) and pump (208). Pressure changes across the valve are monitored, and pump operation is altered in response to such pressure changes. A thermal controller (290) monitors fuel temperature and recirculates a portion of the fuel through heat exchanger (202). The system is available as an original configuration or as a retrofit accessory.
Owner:ARGO TECH CORP
Three-dimensional adaptive compression reconstruction method based on liquid crystal hyperspectral calculation imaging system
ActiveCN113008370AWithout adding complexityRealize 3D Adaptive Compression ReconstructionRadiation pyrometrySpectrum investigationAdaptive compressionImaging quality
The invention discloses a three-dimensional adaptive compression reconstruction method based on a liquid crystal hyperspectral calculation imaging system. The liquid crystal hyperspectral calculation imaging system comprises an LCTF, a coding aperture, a detector and an optical lens. The method comprises the following steps: acquiring low-resolution images of the LCTF under each spectrum channel to obtain a low-resolution data cube; performing interpolation operation to quickly obtain a high-resolution hyperspectral data cube; generating an adaptive coding aperture required by each filtering wave band based on the hyperspectral data cube by using an adaptive coding rule; respectively acquiring a compression measurement value under each spectrum channel through the self-adaptive coding aperture; based on a compressed sensing theory, reconstructing a high-resolution target spectral data cube according to an observation matrix, a sparse base and a compressed measurement value of a system. According to the method, the adaptive coding aperture and the space-spectrum joint dictionary are designed by using prior information, so that the method has high adaptability to a target scene, and the imaging quality can be improved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1
Communication system and method for processing signals therein
InactiveCN101471753AWithout adding complexityRate matchingError prevention/detection by using return channelError correction/detection using convolutional codesPunchingCommunications system
The invention provides a communication system and a method for transmitting signals therein, a pair of turbo codes having the same performance are generated from an information bit sequence by varying an output order of a turbo code generator. A preferred punching mode is utilized to punch a coding bit sequence, the resultant sequence has the same error correction performance and can be used whena transmit diversity method or a H-ARQ method is employed, in order to enhance the performance of the system. When the transmit diversity is utilized to transmit differently-coded bit sequences, a receiver can obtain coding combination gains and maximum ratio combination gains by means of combining the differently-coded bit sequences.
Owner:LG ELECTRONICS INC
Big plane wing assembly working platform
PendingCN106516154AWithout adding complexitySmall space requirementAircraft assemblyDrive shaftDrive motor
A big plane wing assembly working platform is composed of a plurality of working platform bodies. Each working platform body comprises a working table, lifting rods and a lifting mechanism driving the lifting rods to rise and fall. Each lifting rod is mounted on a base in a penetrating mode. Each lifting mechanism comprises a driving motor, a reducer, a main transmission shaft, transmission shafts and four elevators separately driving the corresponding lifting rods to rise and fall. Each main transmission shaft is in transmission connection with the corresponding driving motor through the corresponding reducer and connected with the corresponding transmission shafts through a commutator, wherein the two ends of the two transmission shafts are connected with the corresponding elevators. The lifting mechanisms on all the working platform bodies are uniformly controlled through a numerical control system which drives a driving system to drive the motors to rotate synchronously. The big plane wing assembly working platform synchronously rises and falls through the numerical control system to avoid plane parts, and therefore the problems that traditional movable single big platforms for wing bodies are difficult to manufacture, transport and mount and too complex in mechanism, and have high requirements for workshop sizes are solved.
Owner:ZHEJIANG RIFA AVIATION DIGITAL EQUIP
LED display module, LED display screen and control equipment of LED display screen
ActiveCN110880290AData Feedback RealizationRealize two-way data transmissionStatic indicating devicesComputer hardwareLED display
The invention discloses an LED display module, an LED display screen and control equipment of the LED display screen. The LED display module comprises an LED lamp module, a first bidirectional bus driver and a data feedback module. Wherein the data feedback module is respectively connected with the LED lamp module and the first bidirectional bus driver and is used for forming a plurality of pathsof current signals and inputting the current signals into the LED lamp module to generate feedback data; and the first bidirectional bus driver is used for sending and receiving data to and from the LED lamp module and the data feedback module. According to the embodiment of the invention, the bidirectional data transmission of the LED display module can be realized at low cost, so that the control system can automatically identify the information and the working state of the LED display module, and the intelligent control of the LED display module is realized.
Owner:SHENZHEN LAMP TECH
Pressure maintaining device of ventilator
ActiveCN111888599AWithout adding complexityEnsure the clinical use effectRespiratorsMedical devicesControl signalEmergency medicine
The invention relates to a pressure maintaining device of a ventilator. The device comprises an oxygen source, a compressed air source and an air-oxygen mixer; an oxygen flow control valve is connected between the oxygen source and the air-oxygen mixer through a communication pipeline, and the oxygen flow control valve is used for controlling the oxygen flow in the ventilator pressure maintainingdevice under the action of an oxygen flow control signal ueo; and an air flow control valve is connected between the compressed air source and the air-oxygen mixer through a communication pipeline, the air flow control valve is used for controlling the air flow in the ventilator pressure maintaining device under the action of an air flow control signal uea, and the ventilator pressure maintainingdevice can guarantee synchronous adjustment of pressure and oxygen concentration, so that the clinical use effect of the ventilator is guaranteed.
Owner:SHENZHEN COMEN MEDICAL INSTR
Infrared motion sensing system
InactiveCN107633635AReduced vertical angle sensing areaFree from accidental touchBurglar alarmFresnel lensMotion sensing
The disclosure relates to an infrared motion sensing system. The system comprises an optical assembly, a pyroelectric infrared PIR sensor, a signal processing unit, a determination unit and an alarm unit, the optical assembly comprises a Fresnel lens, the sensible space range of the PIR sensor is limited through the installation height and angle of the Fresnel lens, the infrared energy of a motionobject passing through the sensible space range is concentrated on the PIR sensor, the PIR sensor is used for receiving the infrared energy from the optical assembly to generate a first signal, the signal processing unit is used for performing filtering amplification on the first signal to obtain a second signal, the determination unit is used for determining whether the received second signal satisfies a triggering condition and sending a triggering signal to the alarm unit if yes, and the alarm unit is used for giving an alarm in the condition of receiving the triggering signal. According to the system, the false alarm rate caused by false triggering of animals in a security monitoring system is reduced without increasing the equipment cost and the power consumption.
Owner:SUZHOU RIPPLEINFO TECH CO LTD
Few-mode fiber Bragg grating capable of suppressing high-order mode reflection and laser system
PendingCN111856647ASimple structureEasy to manufactureCladded optical fibreActive medium shape and constructionFew mode fiberFiber Bragg grating
The invention provides a few-mode fiber Bragg grating capable of inhibiting high-order mode reflection and a laser system. A circular refractive index modulation area concentric with a fiber core is arranged in the fiber core of the few-mode optical fiber, the radius of the refractive index modulation area is smaller than that of the fiber core, the refractive index modulation area and an opticalfiber vector mode are both in circular symmetry, an LP01 mode and an LP11 mode cannot be mutually coupled, and energy exchange cannot occur in the LP01 mode and the LP11 mode. The self-coupling coefficient of the LP11 mode is lower than that of the LP01 mode, and the reflectivity of the LP11 mode is lower than that of the LP01 mode, so that reflection suppression of the LP11 mode is realized. Thefew-mode fiber Bragg grating can be used for a high-power fiber laser oscillator to serve as an endoscope, light reflection can be achieved, and mode regulation and control can also be achieved.
Owner:NAT UNIV OF DEFENSE TECH
Correction-free numerical control chamfering algorithm based on polar coordinate machine tool
ActiveCN109947045AWithout adding complexityUniform chamferNumerical controlNumerical controlComputer science
The invention relates to the technical field of numerical control machinery, in particular to a correction-free numerical control chamfering algorithm based on a polar coordinate machine tool. On thebasis of a machining principle of the polar coordinate machine tool which only has an X axis, a Z axis and a C axis, a cylindrical gear is free of correction, eccentric deflection is detected automatically, under the state, a deflection axis does not need to be added, and space chamfering is realized by a cone curve on a cone cutter. According to the method, any two measurable planes in the axialdirection are selected, points are respectively collected according to an equal angle method, relative position models of a machining coordinate system and a workpiece coordinate system are established, a mutual conversion relation is obtained, the position of a target machining contour of the cylindrical gear in the machining coordinate system is obtained, and a cutter point is obtained accordingto the cutting characteristic of the cone curve. The chamfering processing operation process is simplified, and the processing efficiency is improved.
Owner:NANJING GONGDA CNC TECH
Non-isoplanatic aberration correction method and device for adaptive optical line beam scanning imaging
PendingCN111951174AImprove practicalityLow costImage enhancementImage analysisWavefront aberrationBeam direction
The invention discloses a non-isoplanatic aberration correction method and device for adaptive optical line beam scanning imaging, and the method comprises the steps: carrying out the time-sharing correction of the aberration of a non-isoplanatic region in a line beam scanning direction in an adaptive optical line beam scanning imaging system, and carrying out the regional correction of the aberration of the non-isoplanatic region in the line beam direction. According to the invention, the limitation of the isoplanatic region on the adaptive optical imaging field of view can be broken through,and aberration correction and high-resolution imaging of the wide field of view of the retina are achieved. According to the wide-field-of-view non-isoplanatic aberration time-sharing and region-dividing correction method and device, wide-field-of-view aberration correction can be completed only through a single wavefront sensor and a single wavefront corrector, and almost no system complexity isincreased. The deconvolution image correction method provided by the invention is low in cost, can compensate adaptive optical aberration correction to the maximum extent through regional deconvolution of wavefront aberration information, is good in correction effect, can perform online processing and post-processing, and is flexible and convenient.
Owner:SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
Image forming device and safety control system
PendingCN112445444AWithout adding complexityImprove experienceInternal/peripheral component protectionDigital output to print unitsControl systemControl engineering
The invention provides an image forming device and a safety control system thereof. The safety control system comprises a first control system and a second control system. The first control system comprises a safety module, and the safety module is configured to perform safety supervision on information of the image forming device; the second control system is configured to control the image forming device to execute imaging operation; the first control system is in communication connection with the terminal equipment, the first control system is further electrically connected with the secondcontrol system; and when the image forming device transmits data to the terminal equipment, if the communication connection between the first control system and the terminal equipment is disconnected,the first control system firstly controls the second control system to be closed, then, the first control system is automatically restarted, and the second control system is controlled to be started.According to the image forming device, when the communication connection between the first control system and the terminal equipment is disconnected, the first control system can firstly control thesecond control system to be closed and then automatically restarts, and can control the second control system to be started.
Owner:ZHUHAI PANTUM ELECTRONICS
Staggered bonding metal circuit
InactiveCN111465211AMany channelsSave bonding spacePrinted circuit assemblingPrinted circuit non-printed electric components associationEngineering physicsMechanical engineering
The invention discloses a staggered bonding metal circuit. The staggered bonding metal circuit comprises a first metal circuit and a second metal circuit, wherein the first metal circuit comprises first wide channels and first narrow channels, the second metal circuit comprises second narrow channels and second wide channels, the first wide channels and the second wide channels are arranged in a staggered mode, and the first narrow channels and the second narrow channels are arranged in a staggered mode. According to the staggered bonding metal circuit provided by the invention, an original arrangement design is changed, so the wide channels and the narrow channels are sequentially arranged at intervals in a horizontal direction, bonding space can be effectively saved, operability is high,and the staggered bonding metal circuit is very worthy of popularization.
Owner:ANHUI FANGXING PHOTOELECTRIC NEW MATERIALS TECH
Modular multi-level multi-terminal flexible direct current system direct current fault handling method
ActiveCN103066573BTroubleshooting method is simple and easyReliable methodEmergency protective circuit arrangementsModularityFault handling
The invention provides a modular multi-level multi-terminal flexible direct current system direct current fault handling method which comprises the following steps that (1) a relay protection device detects a multi-terminal flexible direct current system in real time, if a direct current fault point is detected, breakers at two ends of a direct current line are switched off, and converters of stations are kept in a running state; (2) the switched-off breakers are switched on, whether the fault disappears is detected, if the fault does not disappear, the breakers are switched off again, and if the fault disappears, a step (3) is carried out; (3) the direct current line is used, and the system runs normally. The modular multi-level multi-terminal flexible direct current system direct current fault handling method is simple, easy to implement and reliable, influences on a plurality of converter stations of temporary direct current faults are reduced, timely recovery and running of the system after the temporary direct current faults are removed are guaranteed effectively, and device running safety is guaranteed at the same time.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
Capacitor network mismatch correction method and device, electronic equipment and storage medium
ActiveCN113098514AHigh precisionLow costAnalogue/digital conversion calibration/testingCapacitanceTerminal voltage
The invention discloses a capacitor network mismatch correction method and device, electronic equipment and a storage medium. The method comprises the steps: 1, dividing a plurality of capacitors of a predetermined digital code of a to-be-corrected ADC into a plurality of capacitor banks; 2, combining the plurality of capacitor banks, equally dividing the capacitor banks into first and second part capacitors, connecting a free end of the first part capacitor to a first reference voltage, connecting a free end of the second part capacitor to a second reference voltage, and connecting common ends of the first and second part capacitors to a common mode voltage; 3, disconnecting the common end of the first part capacitor and the second part capacitor from the common-mode voltage, and changing the free end of the first part capacitor and the free end of the second part capacitor to be connected with the common-mode voltage; 4, obtaining the common terminal voltage of each capacitor combination at the step 2 and the step 3, and correcting the capacitor network mismatch of the predetermined digital code according to the voltage difference between the common terminal voltage of each capacitor combination at the step 2 and the step 3; 5, executing the steps 1-4 according to a sequence from high order to low order of each digital code in the ADC to be corrected.
Owner:BEIHANG UNIV
Capacitor network mismatch correction method and device
ActiveCN113114244AHigh precisionWithout adding complexityAnalogue/digital conversion calibration/testingCapacitanceA d converter
The invention discloses a capacitor network mismatch correction method and device, and the method comprises the steps: 1, obtaining an ideal threshold voltage of a predetermined digital code of an ADC to be corrected according to a predetermined rule; 2, arranging a plurality of capacitors corresponding to the predetermined digital code so as to minimize the error between the threshold voltage of the predetermined digital code and the ideal threshold voltage; 3, executing the step 1 and the step 2 on each digital code in the ADC to be corrected according to the sequence from the high-order digital code to the low-order digital code so as to correct the mismatch of the capacitor network of the ADC to be corrected. According to the invention, the capacitor network mismatch of the ADC can be corrected, so that the precision of the ADC can be improved.
Owner:BEIHANG UNIV
Method for monitoring quality of link between HNB (Home Node Base station) and HNB GW (Home Node Gateway) as well as system thereof
ActiveCN101841841BAccurately determineWithout adding complexityData switching networksWireless communicationFemtocellMonitoring methods
The invention discloses a method for monitoring quality of a link between a HNB (Home Node Base Station) and a HNB GW (Home Node Gateway) as well as a system thereof, aiming to solve the problem that the quality of the link can not be effectively monitored. In the method for monitoring the quality of the link, a home node base station management server (HMS) counts and reports a first parameter value of the quality information of the link at the HNB side of the link to be monitored; meanwhile, the home node base station gateway management server (HGWMS) counts and reports a second parameter value of the quality information of the same link at the HNB GW side of the chain to be monitored; a link quality monitoring device compares the first parameter value and the second parameter value of the received link quality and determines the quality of the link between the HNB and the HNB GW. The effective monitoring for the quality of the link between HNB and the HNB GW is realized, so that the invention can accurately determine that the generation reason of the network problem between HNB and the HNB GW is the link fault.
Owner:CHINA MOBILE COMM GRP CO LTD
Ink jet printing apparatus and print head recovery method
An ink jet printing apparatus and a print head recovery method are provided which effectively execute a preliminary ejection to eject ink not contributing to image printing from nozzle opening of the print head to maintain the ink ejection performance in good condition. The ink in the print head is heated to a first temperature, at which a first preliminary ejection is executed. Then, when the ink temperature falls to a second temperature, which is lower than the first temperature, a second preliminary ejection is executed.
Owner:CANON KK
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