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36results about How to "Compensation for non-linearity" patented technology
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Discontinuous linear motor system
ActiveUS20130229134A1Simple power supplyLow costMotor/generator/converter stoppersDC motor speed/torque controlEngineeringMotor function
A linear motor system includes a discontinuous linear motor and motor control device. The discontinuous linear motor includes a mover and a plurality of individual motors spaced from each other along a movement path of the mover. Each of the individual motors functions as an armature on a primary side of one independent linear motor. A sensor, arranged to act as a linear scale, is disposed for each individual motor and detects a position of the mover. The motor control device includes a plurality of individual motor control units and a multiple unit controller to comprehensively control the individual motor control units. The individual motor control units control the individual motors disposed in curved path sections, and each of the individual motor control units includes a curved-line correspondence corrector to correct a detection value obtained from the sensor according to a relationship between a curved line of the path and a position of the sensor.
Owner:MURATA MASCH LTD
Inverse function method for semiconductor mixer linearity enhancement
ActiveUS6982588B1Sacrificing Gain and Noise FigureImprove linearityModulation transference balanced arrangementsComputations using contact-making devicesFrequency mixerLocal oscillator
The mixer circuit includes a differential rf input driver; a differential local oscillator input circuit coupled to the differential rf input driver; a non-linear load coupled to the differential local oscillator input circuit wherein the non-linear load compensates for non-linearity of the differential rf input driver. The non-linear load has a V-I (voltage-current) transfer function the inverse of the input driver. This improves the mixer linearity without sacrificing the Gain or Noise Figure.
Owner:TEXAS INSTR INC
Discontinuous linear motor system
ActiveUS8796959B2Simple power supplyLow costMotor/generator/converter stoppersDC motor speed/torque controlElectric machineMotor control
A linear motor system includes a discontinuous linear motor and motor control device. The discontinuous linear motor includes a mover and a plurality of individual motors spaced from each other along a movement path of the mover. Each of the individual motors functions as an armature on a primary side of one independent linear motor. A sensor, arranged to act as a linear scale, is disposed for each individual motor and detects a position of the mover. The motor control device includes a plurality of individual motor control units and a multiple unit controller to comprehensively control the individual motor control units. The individual motor control units control the individual motors disposed in curved path sections, and each of the individual motor control units includes a curved-line correspondence corrector to correct a detection value obtained from the sensor according to a relationship between a curved line of the path and a position of the sensor.
Owner:MURATA MASCH LTD
GaAs HBT high-gain broadband linear transconductance unit circuit
ActiveCN101989837ACompensation for non-linearityIncrease buff effectAmplifier modifications to reduce non-linear distortionDifferential amplifiersTransconductanceCurrent source
The invention discloses a GaAs HBT high-gain broadband linear transconductance unit circuit comprising an input stage subcircuit, a basic transconductance subcircuit, a linear subcircuit, a negative resistance subcircuit and a mirror current source subcircuit, wherein the input stage subcircuit is used for level shift of input differential voltages IN_P and IN_N and conducts shifted signals into the basic transconductance subcircuit; the basic transconductance subcircuit is used for converting the input differential voltage signals into differential current signals; the linear subcircuit is used for improving the linearity of the basic transconductance subcircuit; the negative resistance subcircuit is used for improving the gain of the transconductance circuit; and the mirror current source subcircuit is used for providing bias current for the rest circuits. The circuit is designed and manufactured by a GaAs HBT technology and has wide operation bandwidth; the adopted linear subcircuit can effectively complement the nonlinearity of the circuit and provides excellent linearity; and the negative resistance subcircuit is adopted to effectively solve the conflict between the high-gainrequirement of circuits and transistor saturation and improves high-gain performance.
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI
Measurement circuit and measuring method of LVDT (Linear Variable Differential Transformer)
ActiveCN106370096AAchieve outputFew influencing factorsElectric/magnetic position measurementsUsing electrical meansLinear variable differential transformerSignal conditioning circuits
The invention discloses a measurement circuit of an LVDT (Linear Variable Differential Transformer). The measurement circuit comprises a sinusoidal pulse width modulator, a signal conditioning circuit, a linear variable differential transformer, a first sampling circuit, a second sampling circuit and a controller; the sinusoidal pulse width modulator is used for outputting pulse width and frequency-adjustable rectangular wave signals; the input end of the signal conditioning circuit is connected with the sinusoidal pulse width modulator; the signal conditioning circuit outputs amplitude and frequency adjustable sinusoidal wave signals; the primary coil of the linear differential transformer is connected with the output end of the signal conditioning circuit to receive the sinusoidal wave signals as LVDT excitation signals; the secondary coil of the linear differential transformer outputs LVDT differential signals; the input end of the first sampling circuit is connected with the primary coil; the input end of the second sampling circuit is connected with the secondary coil; and the controller is connected with the output end of the first sampling circuit and the output end of the second sampling circuit and is used for performing amplitude normalization processing to output an LVDT linear position. With the measurement circuit of the LVDT, relatively complicated analog circuit parameter adjustment is avoided, zero-point residual voltage, phase drift and sensor nonlinearity can be effectively compensated. The measurement circuit has the advantages of high stability and can reduce measurement errors.
Owner:SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
Method and device for compensating nonlinearity of electro-absorption modulator
ActiveCN103399418ACompensation for non-linearityNon-linear opticsElectro-absorption modulatorSpectral bands
The invention provides a method and a device for compensating nonlinearity of an electro-absorption modulator. A system comprises a laser, an electro-absorption modulator, a spectral filter, a preprocessing module, and an optical receiver, wherein the laser is used for generating an optical signal, the electro-absorption modulator connected with the laser is used for modulating the optical signal to obtain multi-sideband spectrum of the optical signal, the spectral filter connected with the electro-absorption modulator is used for controlling the amplitude of 0-order spectral sideband of the optical signal according to the multi-sideband spectrum so as to obtain the compensated optical signal, the processing module connected with the spectral filter is used for preprocessing the compensated optical signal, and the optical receiver connected with the preprocessing module is used for converting the preprocessed optical signal into an electrical signal and outputting the electrical signal. The method and the device have the advantages that the 0-order spectral sideband of the optical signal is processed, thus the nonlinearity of the modulator is compensated only by spectral band-stop filtering and limitation of the microwave photonic system is avoided.
Owner:TSINGHUA UNIV
Tilt mirror controlling apparatus and method
Owner:FUJITSU LTD
Circuit for linearization of power amplifier
InactiveCN104362988ACompensation for non-linearityAdd nonlinearityAmplifier modifications to reduce non-linear distortionHigh frequency amplifiersCapacitanceEngineering
The invention relates to a circuit for linearization of a power amplifier, is mainly applied to linearization application of a radio frequency power amplifier, and belongs to the design field of radio frequency integrated circuits. The circuit adopts the structure that a PMOS is connected in parallel with the grid end of an NMOS according to the characteristic that the grid capacitance of the NMOS and that of the PMOS are complimentary along with the grid voltage variation; the grid capacitance of the NMOS is compensated by that of the PMOS, so that the input terminal capacitance of the circuit is a constant during grid voltage variation. Therefore, when the input amplitude of the circuit changes under a large signal work mode of the circuit of the power amplifier, the input terminal capacitance of the circuit is a constant; nonlinearity caused by grid capacitance variation of the NMOS is eliminated; the degree of linearity of the power amplifier is improved. Moreover, when the design of the power amplifier adopts PMOS, the PMOS can be compensated through the NMOS to realize linearization of the power amplifier.
Owner:BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
Method and system for automatic gain control with adaptive table lookup
InactiveUS6959082B1Easy to controlCompensation for non-linearityInterconnection arrangementsGain controlEngineeringLookup table
A method and system for automatic gain control is provided. The automatic gain control may be used, for example, with a microphone and voice codec of a speakerphone telephone. In an exemplary embodiment, an amplification gain lookup table stores the gain values. The power of the input signal is estimated and the appropriate gain value is selected as a function of the estimated power of the input signal. The gain value is applied to the input signal to provide an automatic gain controlled output signal. In another embodiment, the gain lookup table may be adapted to compensate for the non-linearity of the microphone and voice codec of the speakerphone. In this alternate embodiment, the output power of the automatic gain controlled signal is estimated and compared to a reference signal to generate an error signal. The error signal may be scaled and used to update and dynamically adapt the gain values in the gain lookup table.
Owner:VALTRUS INNOVATIONS LTD +1
Method and apparatus for controlling a variable-colour light source
InactiveCN101352101ACompensation for non-linearityAccurate Color ControlElectrical apparatusElectroluminescent light sourcesBiological activationBrightness perception
Owner:MARTIN PROFESSIONAL
Architecture for maintaining constant voltage-controlled oscillator gain
InactiveUS20090273405A1Reduce variationCompensation for non-linearityPulse automatic controlCurrent controlled oscillatorHolding current
A voltage controlled oscillator and a method of operating a voltage-controlled oscillator are disclosed. The oscillator comprises a current controlled oscillator having a variable frequency current output, a first control path for generating a first control current having a first adjustable gain, and a second control path for generating a second control current having a second adjustable gain. A summer is provided for adding the first and second control currents to obtain a summed control current, and for applying the summed control current as an input current to the current controlled oscillator. A control sub-circuit is used for controlling the gain of the first control current as a function of a defined voltage on the second control path to maintain constant the gain of the current output of the current controlled oscillator over a given operating range of the current controlled oscillator.
Owner:GLOBALFOUNDRIES INC
Sweep frequency linearization and coherent enhancement method based on composite optical phase-locked fiber laser
ActiveCN112968344AShorten lock timeCompensation for non-linearityActive medium shape and constructionLaser lightAcousto-optics
The invention discloses a sweep frequency linearization and coherent enhancement method based on a composite optical phase-locked fiber laser. The method comprises the following steps of: in an open-loop state of a sweep frequency laser light source system, obtaining a group of control voltage signals through calculation, and preliminarily correcting the response linearity of the sweep frequency fiber laser under the driving of the control voltage signals; and on the basis of the open-loop state of the frequency sweep laser light source system, adding a piezoelectric ceramic driving loop and an acousto-optic frequency shifter loop to form a closed-loop state, making frequency sweep light signals pass through a Mach-Zehnder interference structure and a photoelectric detector to generate beat frequency signals with frequency sweep information, and frequency sweep driving signals, outputting error signals through a digital phase discriminator, loading the error signals to the control voltage signals to form new feedback control signals, and making the piezoelectric ceramic driving loop and the acousto-optic frequency shifter loop enter a closed-loop feedback control state under the driving of the new feedback control signals. By adopting the composite optical phase locking technology, the sweep frequency linearization and coherence of the optical fiber laser are enhanced at the same time.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Scanning probe microscope
InactiveUS20060219899A1Shorten the timeLarge movable rangeMaterial analysis using wave/particle radiationNutsNarrow rangeScanning probe microscopy
A scanning probe microscope (SPM) is provided capable of a narrow to a wide range observation according to observed targets or purposes without replacing a scanner while maintaining a high resolution. The SPM is provided with a probe-side scanner 10 and a sample-side scanner 11. The probe-side scanner 10 is to move the probe 13 in X-, Y-, Z-axis directions, and the sample-side scanner 11 is to move the sample 12 in the X-, Y-, Z-axis directions. A scanner with a small maximum scan range is used as the probe-side scanner 10; a scanner with a large maximum scan range is used as the sample-side scanner 11; and both can be switched between each scanner for use according to the observed targets or purposes. Alternatively, the probe-side scanner 10 is used for scanning in a narrow range, and the sample-side scanner 11 is used to move the field of view.
Owner:SHIMADZU CORP
Measurement system for sea water temperature
ActiveCN102401698AOvercoming time-varying errorsHigh sensitivityThermometers using electric/magnetic elementsUsing electrical meansConstant current sourceSeawater
The invention disclose a measurement system for sea water temperature, which comprises a nonequilibrium bridge circuit unit, a constant current source generation circuit unit, a voltage follower circuit unit and a filter amplifier circuit unit, wherein the input end of the nonequilibrium bridge circuit unit is connected with an anode of direct voltage through a resistor R8; the output end of the nonequilibrium bridge circuit unit is connected with the voltage follower circuit unit; the output end of the constant current source generation circuit unit is connected with the nonequilibrium bridge circuit unit; the voltage follower circuit unit is connected with the filter amplifier circuit unit through a resistor R9 and a resistor R10; and the input end of the constant current source generation circuit unit is connected with a plus 5V power supply. The measurement system has the characteristics of high sensitivity, good stability, long service life and the like; the measurement precisionof the measurement system is much higher than that of the traditional thermocouple or the pressure type thermodetector; and the measurement system has obvious technical advantages in the conventionaltemperature measurement range (minus 2 DEG C - 30 DEG C) of the sea water.
Owner:INST OF OCEANOLOGY - CHINESE ACAD OF SCI
Equalizer and reproduction signal processing device
InactiveUS7321620B2Accurate compensationCompensation for non-linearityMultiple-port networksTransmission control/equlisationSelf adaptiveSignal processing
The present invention provides an equalizer capable of accurately compensating for non-linearity of an input signal due to the asymmetry phenomenon, etc., during the disk production process. Two tap coefficients are provided in a coefficient unit. A comparator compares the value of a middle tap signal, which is a reference signal, and a threshold, so as to produce a selection signal based on the comparison result. The coefficient unit selects one of the two tap coefficients as the selected tap coefficient based on the selection signal, and a tap signal is multiplied with the selected tap coefficient. Thus, it is possible to adaptively switch the tap coefficients of the equalizer as a whole based on the value of the middle tap signal, which is the reference signal. Therefore, it is possible to accurately compensate for the non-linearity of the input signal.
Owner:PANASONIC CORP
High-sensitivity receiver front-end circuit with impedance mapping function
The invention, which belongs to the field of the wireless communication technology, particularly relates to a high-sensitivity receiver front-end circuit with an impedance mapping function. The high-sensitivity receiver front-end circuit comprises a linearity compensation circuit, a low-noise trans-conductance amplifier circuit, an active negative feedback circuit, a divider circuit, a passive mixer circuit, an in-phase trans-impedance amplifier and a quadrature trans-impedance amplifier. With the impedance mapping function of the passive mixer circuit, the impedance with a low-pass characteristic at a low-frequency site is mapped to a radio-frequency side by using a local frequency as a center; and the output terminal of the low-noise trans-conductance amplifier forms abandpass filter with a high-frequency high-quality factor equivalently. The low-noise trans-conductance amplifier provides gains at a first level of a receiver, so that noises of the post-stage circuit can be suppressed effectively and the sensitivity of the whole link can be improved. Moreover, with the active negative feedback of the low-noise trans-conductance amplifier, the impedance is mapped to the input terminal and the out-of-band blocking signal is suppressed by using impedance matching of the input terminal, so that the anti-interference capability of the receiver can be enhanced and the dynamic range of the front end can be extended.
Owner:FUDAN UNIV
Simulation rotary table control system based on PID control
The invention discloses a simulation rotary table control system based on PID control. The system includes a measurement and control unit, an execution unit and a feedback unit. The measurement and control unit is connected to a simulation rotary table through the execution unit. The measurement and control unit includes a DSP motion control card. The DSP motion control card and the execution unitare connected. The execution unit includes an analog-to-digital converter, a driver, a servo motor and a decelerator which are successively connected. The decelerator and the simulation rotary tableare connected. The simulation rotary table is connected to the controller through the feedback unit. The feedback unit includes a speed feedback apparatus and a position feedback apparatus. The speedfeedback apparatus includes a speed ring and a speed ring controller. The speed ring controller uses a PI controller. The position feedback apparatus includes a position ring and a position ring controller. The position ring controller uses a PID controller. According to the invention, the system herein has a simple structure, and can control the operation of the simulation rotary table through the measurement and control unit, the execution unit and the feedback unit. The system can also increase the stability of the operation of the simulation rotary table, and ensures the stable operation of the simulation rotary table.
Owner:王才旺
Scanning probe microscope
InactiveUS7391022B2Shorten the timeLarge movable rangeMaterial analysis using wave/particle radiationSurface/boundary effectNarrow rangeScanning electron microscope
A scanning probe microscope (SPM) is provided capable of a narrow to a wide range observation according to observed targets or purposes without replacing a scanner while maintaining a high resolution. The SPM is provided with a probe-side scanner 10 and a sample-side scanner 11. The probe-side scanner 10 is to move the probe 13 in X-, Y-, Z-axis directions, and the sample-side scanner 11 is to move the sample 12 in the X-, Y-, Z-axis directions. A scanner with a small maximum scan range is used as the probe-side scanner 10; a scanner with a large maximum scan range is used as the sample-side scanner 11; and both can be switched between each scanner for use according to the observed targets or purposes. Alternatively, the probe-side scanner 10 is used for scanning in a narrow range, and the sample-side scanner 11 is used to move the field of view.
Owner:SHIMADZU CORP
Global pixel nonlinear compensation structure
ActiveCN105554421AImprove dynamic rangeOptimize timingTelevision system detailsColor television detailsAnalog to digital conversionEngineering
The invention provides a global pixel nonlinear compensation structure. A global pixel includes a pixel circuit module and an analog-to-digital conversion module; the analog-to-digital conversion module comprises a comparator which is provided with a positive input end Vin1 connected with the pixel circuit module and a negative input end Vin2 receiving reference voltage Vramp; the nonlinear compensation structure comprises a compensation circuit module; and the compensation circuit module is connected between reference voltage Vramp signals and the negative input end Vin2 of the comparator and is used for compensating nonlinearity led by the inner circuit of the pixel circuit module. With the global pixel nonlinear compensation structure of the invention adopted, the nonlinearity of the global pixel can be compensated, and the dynamic range of the global pixel can be improved; and a time sequence can be optimized when the nonlinearity is compensated; and power consumption which is as low as possible is just brought.
Owner:SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT +1
Enhanced predistortion method and apparatus
InactiveUS7030693B2Reduce power levelLittle non-linearityAmplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceLookup tablePredistortion
A method may include determining a power level of a signal and a temperature level of a transmitter originating the signal. At least one of the power and temperature levels may be compared to a lookup table containing predistortion coefficients. The method is capable of predistorting a signal based on the comparison. An apparatus is disclosed in relation to the method.
Owner:ALCATEL-LUCENT USA INC
Architecture for maintaining constant voltage-controlled oscillator gain
InactiveUS7741919B2Improve stabilityReduce Noise SensitivityPulse automatic controlEngineeringCurrent controlled oscillator
A voltage controlled oscillator and a method of operating a voltage-controlled oscillator are disclosed. The oscillator comprises a current controlled oscillator having a variable frequency current output, a first control path for generating a first control current having a first adjustable gain, and a second control path for generating a second control current having a second adjustable gain. A summer is provided for adding the first and second control currents to obtain a summed control current, and for applying the summed control current as an input current to the current controlled oscillator. A control sub-circuit is used for controlling the gain of the first control current as a function of a defined voltage on the second control path to maintain constant the gain of the current output of the current controlled oscillator over a given operating range of the current controlled oscillator.
Owner:GLOBALFOUNDRIES INC
Measurement system for sea water temperature
ActiveCN102401698BCompensation for non-linearityImprove stabilityThermometers using electric/magnetic elementsUsing electrical meansElectrical resistance and conductanceSea temperature
Owner:INST OF OCEANOLOGY - CHINESE ACAD OF SCI
Acoustic reflectometry instrument and method
InactiveUS20100087751A1Improve accuracyImprove reliabilityDiagnostics using vibrationsSensorsReflecting instrumentSources of error
An acoustic reflectometry instrument and method for ascertaining fluid presence in an ear. Drive side normalization involves normalizing the speaker to adjust its output to compensate for non-linearity over a frequency range used for acoustic reflectometry measurement of the ear. The microphone is normalized to compensate for system non-linearity. Measurement involves repetition a selected number of times until the spectral gradient angle is within a specified range for each repetition to provide validation of the measurement. For enhanced reliability, various sources of error are tested.
Owner:INNOVIA MEDICAL LTD
High-linearity amplifier
ActiveUS20210152134A1Improve linearityCompensation for non-linearityAmplifier modifications to reduce non-linear distortionNegative-feedback-circuit arrangementsSoftware engineeringHemt circuits
A high-linearity amplifier including a main operational amplifier, a feedback circuit, and a compensation circuit is shown. The feedback circuit couples an output signal of the main operational amplifier to an input port of the main operational amplifier. The compensation circuit is coupled to the input port of the main operational amplifier to compensate for the non-linearity of the feedback circuit. A signal coupled to the input port of the main operational amplifier through the compensation circuit has an inverse phase compared to the output signal of the main operational amplifier.
Owner:MEDIATEK INC
Power amplifier and method for CDMA system
InactiveCN1236576CSolve the real problemCompensation for non-linearityAmplifier modifications to reduce non-linear distortionTransmission control/equalisingCdma systemsEngineering
A power linearizer of a CDMA system preferably includes a linearization input unit for compensating a level of an input signal to remove a non-linearity of a power amplifier; an amplification controller for controlling an amplification of the power amplifier; and the power amplifier operated under the control of the amplification controller, for amplifying the power of the level-compensated input signal. By adjusting the voltage inputted to the input terminal of the voltage controlled power amplifier (VCA), the non-linearity of the VCA can be accurately compensated and the power compensation can be easily performed. In addition, the capacity of the CDMA system can be increased.
Owner:ERICSSON-LG
lvdt measuring circuit and its measuring method
ActiveCN106370096BAchieve outputFew influencing factorsElectric/magnetic position measurementsUsing electrical meansLinear variable differential transformerObservational error
Owner:SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
GaAs HBT high-gain broadband linear transconductance unit circuit
ActiveCN101989837BCompensation for non-linearityIncrease buff effectAmplifier modifications to reduce non-linear distortionDifferential amplifiersPower flowEngineering
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI
A magnetic levitation molecular pump motor control device with power failure compensation function
ActiveCN103701397BHighly integratedImprove versatilityAC motor controlBearingsDigital signal processingMagnetic bearing
The invention provides a Maglev (Magnetic Levitation) molecular pump motor control device with an electric power failure compensation function. The Maglev molecular pump motor control device mainly comprises a single-phase controllable rectifier module, a three-phase inverter bridge module, a DSP (Digital Signal Processing) control module, a high-voltage DC (Direct Current) / DC module and a low-voltage DC / DC module. When the Maglev molecular pump motor control device is in normal running, the DSP control module can be used for firstly adjusting busbar voltage into a starting voltage value through the single-phase controllable rectifier module, then controlling the three-phase inverter bridge module to drive a permanent magnetic motor to run and increasing the busbar voltage to a rated value step by step, an external AC (Alternating Current) power supply can be simultaneously monitored through a voltage sensor by a system, the DSP control module controls the high-voltage DC / DC module which serves as a converter to run if external electric power is in failure, the single-phase controllable rectifier module and the three-phase inverter bridge module can be closed, the permanent magnetic motor enters into a power generating mode at the moment, by using a system, energy fed back by the permanent magnetic motor can be converted into a power power supply and a control power supply of a magnetic bearing through the high-voltage DC / DC module and the low-voltage DC-DC module, and the compensation function of the Maglev molecular pump system under the situation that the external electric power is in failure can be realized.
Owner:BEIHANG UNIV
Optimization method of driving voltage for tunable Fabry-Perot filter
ActiveCN110275292BCompensation for non-linearityLow costOptical elementsVoltage optimisationAlternating current
The invention relates to a driving voltage optimization method for a tunable Fabry-Perot filter, which converts the rising part of the traditional AC driving voltage into a plurality of gradually increasing DC voltage segments, and searches for the optimal split voltage through the particle swarm algorithm. The duration of the segment DC voltage is used to obtain the optimized DC voltage; the center position of the reflection peak obtained by scanning the traditional AC voltage drive is converted into the center position of the response of the adjustable filter under the optimized DC voltage to obtain the final AC-DC drive Voltage. To effectively compensate the voltage-wavelength nonlinearity of the tunable Fabry-Perot filter, without adding any hardware equipment, only digital compensation is used to correct the AC drive voltage, thereby compensating for the nonlinearity of the filter. The method of the invention has low cost, strong transplantability and high reliability.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
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