201results about How to "Good linearity" patented technology

The invention provides a transmission device having adaptive digital predistortion, which has a transmission path and a feedback path. The transmission path contains a predistortion unit which takes a derived control signal (LS) and baseband signals applied to the input side as a basis for calculating the address of a predistortion coefficient (KOEFF1) stored in a memory and logically combines this predistortion coefficient with the applied baseband signals in a complex multiplication unit. The use of complex coefficients and of the complex multipliers allows compensation both for AM / AM distortion and for AM / PM distortion in an amplifier device connected downstream of the predistortion unit. Usefully, the feedback path of the transmission device with digital adaptive predistortion can also be implemented using the reception device in a transceiver.

The invention provides a transmission device having adaptive digital predistortion, which has a transmission path and a feedback path. The transmission path contains a predistortion unit which takes a derived control signal (LS) and baseband signals applied to the input side as a basis for calculating the address of a predistortion coefficient (KOEFF1) stored in a memory and logically combines this predistortion coefficient with the applied baseband signals in a complex multiplication unit. The use of complex coefficients and of the complex multipliers allows compensation both for AM / AM distortion and for AM / PM distortion in an amplifier device connected downstream of the predistortion unit. Usefully, the feedback path of the transmission device with digital adaptive predistortion can also be implemented using the reception device in a transceiver.

The invention provides a multi-carrier digital frequency-selecting remote system, which comprises a digital access control unit DAU and a digital radio remote unit DRU, wherein the digital access control unit DAU is connected with the digital radio remote unit DRU through optical fiber; the digital access control unit DAU comprises a DAU duplexer, a DAU downlink, a DAU photoelectric conversion subsystem, a DAU uplink, a DAU power subsystem and a DAU monitoring subsystem; the digital radio remote unit DRU comprises a DRU photoelectric conversion subsystem, a DRU downlink, a DRU duplexer and a DRU uplink; and the DRU monitoring subsystem and the DRU power subsystem are connected with the DRU uplink and the DRU downlink respectively. The system replaces a surface filter SAW with a digital intermediate-frequency processing technique in software radio, so as to keep a hardware platform unchanged, reduce the application of analog devices and guarantee the consistency of system performances while the number of carriers is increased / decreased at will.

A mixer circuit arrangement 30 comprises a complementary transconductor circuit 31 and a mixer stage 32. The complementary transconductor circuit 31 includes two paths in parallel between a positive supply voltage VDD and ground G and is connected directly between the voltage supply terminals VDD and G. The first path includes a P-type MOS transistor TP1 and an N-type MOS transistor TN1 connected in series. Similarly, the second path includes a P-type MOS transistor TP2 and an N-type MOS transistor TN2 connected in series. The gate electrodes of the P-type transistors TP1 and TP2 are connected to a voltage bias Vbp via high value bias resistors Rb, and the gate electrodes of the N-type transistors TN1 and TN2 are connected to a second voltage bias Vbn via high value bias resistors Rb. The mixer stage 32 is connected between the output of the complementary transconductor circuit 31 and a load, the load also being connected to one of the supply terminals.

The invention provides a wideband digital frequency selecting pulling system, wherein a DAU diplexer in DAU, a DAU wideband digital downlink, a DAU photoelectric conversion subsystem, a DAU wideband digital uplink, and a DAU diplexer are connected in sequence; a DAU power subsystem and a DAU monitoring subsystem are respectively connected with the DAU wideband digital downlink and the DAU wideband digital uplink; the DRU photoelectric conversion subsystem in DRU, a DRU wideband digital uplink, a DRU diplexer, a DRU wideband digital downlink, and a DRU photoelectric conversion subsystem are connected in sequence; and a DRU monitoring subsystem and a DRU power subsystem are respectively connected with the DRU wideband digital uplink and the DRU wideband digital downlink. The invention also provides a signal processing method which is achieved by adopting the system. The invention can reduce the use of analog devices and realize the bandwidth digital frequency radiating pulling system with different bandwidth.

The invention belongs to the technical field of intelligent processing and manufacturing, and particularly discloses an integrated active-passive compliant one-dimensional variable force grinding andpolishing device and a control method. The integrated active-passive compliant one-dimensional variable force grinding and polishing device comprises a linear module servo motion platform, a mountingflange, a limiting plate, a position and orientation sensor, a speed-adjustable compliant grinding and polishing mechanism and a controller, and the linear module servo motion platform is used for driving the grinding and polishing mechanism to perform linear motion; the mounting flange and the limiting plate are mounted on a base of the linear module servo motion platform, and the position and orientation sensor and the speed-adjustable compliant grinding and polishing mechanism are installed on the limiting plate; and the position and orientation sensor is used for measuring position and orientation of the one-dimensional variable force grinding and polishing device and sending the position and orientation to the controller, a force sensor is arranged between the compliant grinding and polishing mechanism and sliding blocks, the force sensor is used for collecting a contact force signal and send to the controller which can calculate speed control quantity, and the speed-adjustable compliant grinding and polishing mechanism is driven to move by rotation of a servo motor according to the speed control quantity. According to the integrated active-passive compliant one-dimensional variable force grinding and polishing device and the control method, the contact status of a abrasive belt and a workpiece can be adjusted in real time, and a stable and compliant grinding and polishingprocess is realized.

The invention provides a wideband digital frequency-selecting wireless repeater system and a wideband signal digital frequency-selecting method thereof. The donor antenna output terminal of the systemThe invention provides a wideband digital frequency-selecting wireless repeater system and a wideband signal digital frequency-selecting method thereof. The donor antenna output terminal of the systemis connected with a retransmission antenna input terminal by an donor terminal diplexer, a downlink radio frequency receiver subsystem, a downlink wideband digital intermediate frequency processing s is connected with a retransmission antenna input terminal by an donor terminal diplexer, a downlink radio frequency receiver subsystem, a downlink wideband digital intermediate frequency processing subsystem, a downlink radio frequency transmitter subsystem, and a mobile terminal diplexer in sequence; a retransmission antenna output terminal is connected with a donor antenna input terminal by a mubsystem, a downlink radio frequency transmitter subsystem, and a mobile terminal diplexer in sequence; a retransmission antenna output terminal is connected with a donor antenna input terminal by a mobile terminal diplexer, an uplink radio frequency receiver subsystem, an uplink wideband digital intermediate frequency processing subsystem, an uplink radio frequency transmitter subsystem, and a doobile terminal diplexer, an uplink radio frequency receiver subsystem, an uplink wideband digital intermediate frequency processing subsystem, an uplink radio frequency transmitter subsystem, and a donor terminal diplexer in sequence. The invention can be applied to communication systems such as GSM, CDMA, DCS, JDC, TD-SCDMA, WCDMA, CDMA2000, and the like, thereby forming wideband digital frequencnor terminal diplexer in sequence. The invention can be applied to communication systems such as GSM, CDMA, DCS, JDC, TD-SCDMA, WCDMA, CDMA2000, and the like, thereby forming wideband digital frequency-selecting wireless repeater systems with different communication formats and any signal bandwidth.y-selecting wireless repeater systems with different communication formats and any signal bandwidth.

The invention provides a screen state control method, a screen state control device and a touch screen terminal. The screen state control method is used for the touch screen terminal. The touch screen terminal is characterized in that a piezoresistive pressure transducer is arranged below a screen of the terminal, wherein a metal resistance strain gauge is adsorbed on a matrix material of the piezoresistive pressure transducer. The screen state control method comprises the following steps of: according to a pressure on the screen of the terminal, generating an analog signal; converting the analog signal into a digital signal; and according to the digital signal, controlling to switch the screen state of the terminal between switch-off and switch-on. According to the invention, the screen state can be controlled to be switched between switch-off and switch-on without being operated by a physical power button.

The invention provides a pseudo-random code phase tracking method and a code tracking ring multi-path inhibition BOC (Binary Offset Carrier) code tracking method, which effectively inhibit multi-path effect according to structural characteristics of a BOC signal. A pseudo-random code generating step, a BOC code generating step, a reference waveform generating step, a relevant waveform constructing step, a mutual correlation step, a phase discrimination function generating step and a phase discrimination step are included. According to the invention, in the correlation waveform constructing step, the constructed forward correlation function and backward correlation function only have one peak value and good linearity is obtained; and a zero crossing point of a phase discrimination curve and a zero crossing point while no multi-path signal is available have no deviation when multi-path effect exists so that the offset of the tracking point is overcome to achieve the accurate distance measuring and positioning purpose.

The invention discloses a servo circuit of quartz accelerometer, comprising an integrated part and a divided part wherein the integrated part comprises a triangle generator, a differential capacitance detector, an integrating amplifier and a transconductance amplifier; and the divided part comprises a negative feedback circuit, an outer timing capacitor, an outer timing resistance and outer offset resistance. The triangle generator outputs the triangular wave to the differential capacitance detector by an emitter follower. The differential capacitance detector charges and discharges the differential capacitor of the swinging subassembly of the accelerometer the detected differential capacitance signal is converted into the corresponding error current signal and the error current signal is output to the integrating amplifier. After the slowly varying pressure signal is obtained after integrate demodulation by the integrating amplifier, the transconductance amplifier is pushed. The slowly varying pressure signal is added on the electromagnetic torquer of the quartz accelerometer through the transconductance output terminal to form the restoring torque, so as to recover the swing slice at the balance position. The negative feedback circuit is mounted between the inverted input terminal of the integrating amplifier and the output feedback terminal of the transconductance amplifier to form a complete closed loop test system with deep negative feedback.

The invention discloses a nuclear magnetism compatibility surgical robot based on screw drive. The nuclear magnetism compatibility surgical robot based on screw drive comprises a base, a lifting part, a deflection part and a needling part, wherein the needling part is arranged on the deflection part; the deflection part is arranged on the lifting part; the lifting part is arranged on the base; the needling part, the deflection part and the lifting part respectively adopt a screw drive structure. According to the nuclear magnetism compatibility surgical robot based on screw drive, the selectable range of drive of a robot is greatly expanded, common motor drive which cannot be selected in the existing mechanism can be applied in the screw transmission structure, and a common motor can more easily realize high-accuracy control and output variable torque; screw drive has favorable linearity, can effectively overcome delaying phenomenon in pneumatic drive, and provides conditions for improving the accuracy of needing surgery; in addition, due to the screw drive, a drive component is arranged outside a mechanism body, so that the mechanism body is more compact in design, and the problem of limited surgery space under a nuclear magnetism environment is effectively solved.

The invention discloses an LED lamp with the light color adjusting function. The LED lamp comprises a lamp holder, a lamp body and a handle, wherein three LED lamp sets are arranged in the lamp holder and each LED lamp set comprises a high color temperature LED string and a low color temperature LED string. An adjustable drive module, a light color adjusting module and a rechargeable battery are arranged in the handle, and the handle is connected with the lamp body via a multi-shift adjustable rotary knob. The light color adjusting module comprises two brightness adjusting rotary knobs and three dial switches which work together to control the lamp to emit lights with high color temperature, low color temperature and moderate color temperature between the high and low color temperatures, as a result, the adjustment of the color temperature, the spectrum and the brightness can be realized. According to LED lamp disclosed by the invention, the light control signal generation circuit has a simple structure, the linearity of the operation signal is good, the lamp is widely applicable for indoor purposes and outdoor occasions without external power sources and in need of extensive light adjustment of multiple lamps, and further, the modular structure of the lamp brings convenience in installation, maintenance and light emitting angle adjustment.

The invention discloses a closed-loop modulation method of adaptive linear-structure light. A laser beam serves as a spot light source, and a micro vibrating mirror or an optical lens converts the spot light source into linear-structure light, and light intensity of a laser device is modulated via feedback signals, the output light intensity of the laser device is adjusted, and adaptive linear-structure light capable of suspension and rapid movement is generated. Compared with traditional linear-structure light, the light intensity is higher, and the linear characteristic of the linear-structure light is higher; and the linear-structure light is characterized by being high in precision, adaptive light intensity adjustment, capable of suspension and rapid movement. The complexity and cost of a 3D scanning system are reduced, and the measuring precision can be improved. The light intensity of the laser device is adjusted adaptively, objects of different reflectivity can be measured, and the application range of linear-structure light is broadened.

A method for trimming the feed amount of a boring cutter features that when the tip of a boring cutter is revolving around the axis of its handle by an eccentric distance, the revolving diameter of said tip can be changed relatively to the axis of handle while the value of changed diameter can be precisely prompted. Its trimming unit has a cutter handle with a conic hole whose axis is shifted from the axis of handle, a rotary body in said conic hole and with another conic hole, an exchangeable arbor installed in said another conic hole and with a cutter, and a worm-gear driver mechanism installed on handle for driving arbor to rotate.

The invention discloses a surface-modified molecular-imprinted solid-phase microextraction probe and a preparation method therefor. The surface-modified molecular-imprinted solid-phase microextraction probe disclosed by the invention is obtained through taking malachite green as template molecules, and subjecting an organosilicone modified acrylate molecular imprinting emulsion to a thermal polymerization reaction on a tipped wood fiber substrate, of which the surface is rich in hydroxyl group. The solid-phase microextraction probe can be used for directly carrying out high-selectivity extraction on a trace amount of malachite green and structure-similar compounds with triphenylmethane and amino groups from a variety of complicated matrix samples, and the extracted probe can be used for directly carrying out electrospraying mass spectroscopy on a target object under normal-pressure open conditions, so that the probe has extremely high sensitivity and ideal repeatability.

Provided are a power amplifier and a method thereof. The power amplifier power amplifier includes: a main amplifying unit receiving power; an auxiliary amplifying unit connected in parallel to the main amplifying unit; and a balloon transformer combined with the main amplifying unit and the auxiliary amplifying unit. Respectively different bias voltages are applied to the main amplifying unit and the auxiliary amplifying unit.

A mixer circuit comprises an input stage arranged to convert an input voltage signal received at an input of the mixer circuit into at least one current signal, and a frequency conversion stage comprising at least one switching element arranged to convert a signal component of the at least one current signal from an input frequency to a output frequency. The input stage comprises at least one resistance connected between the input of the mixer circuit and the at least one switching element. The at least one switching element and the at least one resistance are arranged such that the at least one switching element comprises a ‘turn-on’ resistance that exhibits a resistivity that is a factor less than the at least one resistance connected thereto.

The invention discloses an infrared array focal plane read-out circuit which comprises a load resistor shunt circuit, a load switch control circuit, a capacitor transconductance feedback and amplifier circuit, an integral / resetting control unit circuit, a storage unit circuit, a correlated double-sampling circuit, an integral gating control circuit and a CDS (correlated double sampling) gating control circuit. The load switch control circuit is controlled by a DA (digital to analog) convertor, so that the problems that integral current is overheavy due to ununiformity of pixels and reference pixels and high resistance difference between the pixels and the reference pixels when a TEC (temperature controller) module is adopted. Complementary switches are used for weakening the charge injection effect. The level can be read out by a two-stage streamline scheme, wherein an integral control unit adopts a multi-way gating parallel integration storage manner, the CDS circuit adopts a one-way output manner, different pixel signals are sequentially output by controlling gating signals, integration and signal read-out can be carried out simultaneously by the two-stage streamline scheme, so that time utilization rate is increased, chip complexity is reduced and power consumption of chips is lowered.

A low noise amplifier includes a cascode device which includes at least a first and a second transistor having a terminal in common. The output terminal of the second transistor is the output terminal of the cascode device and is coupled to the output terminal of the amplifier. The amplifier includes a first circuit means suitable for the polarization of the second transistor. The first circuit means is positioned between a supply voltage and another terminal of the second transistor. The amplifier includes a second circuit means connected to the output terminal of the cascode device and is operative at a given frequency (ω). The first circuit means includes a first series of a resistance and a capacitance and the second means has a second series of a resistance and a capacitance. The first series is coupled between the other terminal of the second transistor and ground and the second series is coupled between the output terminal of the cascode device and ground. The values of the resistances of the first and of the second series are much lower than the module values of the respective capacitive impedances of said first and of said second series at said given frequency (ω).

The invention aims at providing a silicon piezoresistive pressure sensor core body and a production method of the silicon piezoresistive pressure sensor core body for solving the problems that in the existing silicon piezoresistive pressure sensor oil core body, the silicon rubber sticking thickness is great, the ceramic seat design does not adapt to the automatic bonding, the oil injection quantity is large, and small ranges less than 10kPa cannot be produced. The silicon piezoresistive pressure sensor core body comprises a core body seat body, a glass insulator, vent holes, a lead wire and an oil injection cavity, wherein the center of the core body seat body is provided with a concave pit, a chip ceramic seat is arranged in the oil injection cavity, a sensor chip is arranged on the chip ceramic seat, a corrugated diaphragm is arranged above the sensor chip, and a welding ring is arranged on the corrugated diaphragm. The production method of the sensor core body adopts the steps of cleaning, chip sticking, bonding, corrugated diaphragm welding, vacuum oil injection, high-temperature storage, fatigue test, printing, automatic temperature compensation and test. The silicon piezoresistive pressure sensor core body has the advantages that because the size is small, the weight is light, and the output sensitivity is high.

A variable-gain amplifier circuit uses a pair of single-ended operational amplifiers to amplify complementary portions of a differential input signal. By using two single-ended amplifiers instead of a single differential amplifier, linearity is significantly improved. In addition, common mode feedback circuitry is eliminated along with harmonic distortion and other forms of noise which tend to negative affect the quality of the signal output from the circuit.

The invention discloses a wafer temperature detection method. The wafer temperature detection method comprises the following steps of: providing a wafer; forming a bipolar transistor on the wafer and taking the bipolar transistor as a temperature detection device; calibrating the temperature detection device; applying at least three different base region voltages to the base region of the bipolar transistor in turn, making the bipolar transistor work in a linear region, and measuring to obtain at least three collecting region current values corresponding to the three base region voltage values; and performing exponential curve fitting according to the three applied base region voltage values and the at least three corresponding collecting region current values to obtain at least three test temperatures of the wafer; and solving the mean value of the at least three test temperatures, and taking the mean value as the temperature of the wafer. The accuracy and the efficiency of the temperature detection are improved.

A mixer circuit comprises an input stage arranged to convert an input voltage signal received at an input of the mixer circuit into at least one current signal, and a frequency conversion stage comprising at least one switching element arranged to convert a signal component of the at least one current signal from an input frequency to a output frequency. The input stage comprises at least one resistance connected between the input of the mixer circuit and the at least one switching element. The at least one switching element and the at least one resistance are arranged such that the at least one switching element comprises a ‘turn-on’ resistance that exhibits a resistivity that is a factor less than the at least one resistance connected thereto.

The invention relates to a stereovision-based method and a stereovision-based device for detecting a vehicle wheelbase difference and belongs to vehicle performance detection equipment. The method and the device are mainly used to automatically detect the vehicle wheelbase difference on a vehicle comprehensive performance detection line. According to vehicle wheel images captured by four cameras, the detection device identifies the center three-dimensional coordinates of the vehicle wheel images by adopting a computer image processing technology and calculates the vehicle wheelbase difference on the basis of the center three-dimensional coordinates of the vehicle wheels. The system hardware comprises the cameras, an industrial control computer, an opposite-type photoelectric sensor, a revolving platform and a customized calibration target. The method and the device can rapidly and accurately detect the vehicle wheelbase difference. The method has the advantages of unique design idea, excellent linearity, less systematic error, excellent detection precision and repeatability, simple structure and convenient use. The research results have a certain theoretical value and economic value and good prospect of application and popularization.

A damping-rigidness-controllable double-freedom-degree vibration active control platform comprises a cross-shaped beam frame and a square base which are connected through a flexible hinge. A cross-shaped beam of the cross-shaped beam frame is distributed in the diagonal directions of the square base. A structure column is arranged at the center of the cross-shaped beam frame. Sensors and actuators are connected between the lower portions of the diagonal top ends of the cross-shaped beam frame and the square base respectively. Four limiting columns are arranged between the cross-shaped beam of the cross-shaped beam frame and the square base respectively. Prearranged gaps are reserved between the limiting columns and the cross-shaped beam frame. Four balancing weights are fixed on the lower portion of the cross-shaped beam frame between the sensors or the actuators and the limiting columns respectively. Twisting limiting spring pieces are arranged at the symmetrical positions on the lower portion of the cross-shaped beam frame between the limiting columns and the flexible hinge. The electromagnetic type sensors and the electric-damping electric-rigidness actuators are used to achieve detecting of angular speed and actuating, the flexible hinge and the spring piece with changeable thickness are combined to achieve controllable damping and rigidness in a quantifying mode, and double-freedom-degree vibration active control in the x direction and the y direction of the structure is achieved.

The invention relates to a double-airplane passive positioning method based on azimuth angle and pitch angle information, and belongs to the field of passive positioning. The traditional method has the disadvantages that: when passive positioning is carried out, the required observation station number is large; the positioning precision is low; and the measurement error is big. The method in the invention comprises the steps of: establishing a space observation model among two observation airplanes and a target radiation source in a space rectangular coordinate system in a simulated combat environment; observing observation information of the azimuth angle and the pitch angle, in which the target radiation source arrives at the observation airplane, by utilizing the observation airplanes;then, establishing the matrix form of a linear observation equation; establishing the joint basic observation equation of the two observation airplanes; establishing the final observation equation ofthe joint matrix form of the two observation airplanes; and then, solving the final observation equation by utilizing a least square estimation method, so that the space position coordinate of the target radiation source is obtained. The method has the advantages of being high in calculated target coordinate precision, low in complexity and calculation amount and rapid in realization speed.

The invention discloses printable graphene / ZnO-nano-composite-material-based temperature and humidity sensor electrodes and in particular relates to graphene / ZnO-nano-composite-material-based microarray printable temperature and humidity sensor electrodes. In addition, the invention also relates to methods for manufacturing the electrodes. According to the temperature and humidity sensor electrodes, sensors are printed on flexible substrates by an ink-jet printing technology; pasting to an agricultural product is realized; the sensors are arranged conveniently; and the price is low. Meanwhile,because of characteristics of the nano material, the temperature and humidity sensors have high linearity, sensitivity and stability. The graphene / ZnO-nano-composite-material-based snakelike microarray temperature sensor electrode has high linearity; the sensitivity of the testing technique is 1.6% omega / degrees, and the linearity and correlation factor are 2.0% and 0.995 respectively. The sensitivity of the humidity sensor electrode reaches 6.568nF / RH% in a high-humidity environment and the humidity hysteresis is 5.19%; and the response recovery time is good.

An objective of the present invention is to provide attenuated minus-strand RNA viruses. The present inventors discovered that the amino acid mutation at position 1214 (Y1214F) in the amino acid sequence of L protein of Sendai virus suppressed the viral genome replication activity and / or transcription activity. The inventors also found that the deletion of a particular gene from the viral genome could result in much less cytotoxicity and immune response than conventional. The inventors thus completed the present invention.

The invention provides a nonlinear detecting method of a repeater power amplifier. The method can monitor a nonlinearity and digital pre-distortion rectifying result of the power amplifier and judge whether the result is reasonable or not by virtue of a three-order intermodulation valve of a double-tone signal, and the method comprises the following steps: signal preprocessing, FFT simplifying after determination of resolution ratio and intermodulation calculation. Besides a repeater, the nonlinear detecting method is also applicable to a plurality of wireless communication systems comprising a large-power power amplifier. The nonlinear detecting method has the beneficial effects that the intermodulation simplifying detecting algorithm complexity in the numeric field is low, the operating rate is quick, the implementability is achieved, an instrument is not required by the algorithm, nonlinearity degree of the power amplifier can be monitored visually by a repeater system, and the linearity rectifying degree of the power amplifier can be monitored by a digital pre-distortion algorithm simultaneously. By utilizing the nonlinear detecting method, the intermodulation magnitude can be calculated conveniently, the algorithm complexity is low, the source consumption is less, the method is easy to realize, and the stability of the repeater system and the digital pre-distortion algorithm is improved simultaneously.