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56results about How to "Eliminate dissonance" patented technology
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ADC (Analog to Digital Converter) circuit adopting single-ended conversion successive approximation structure
ActiveCN104158546AEliminate dissonanceImprove accuracyAnalogue/digital conversionElectric signal transmission systemsCapacitanceMultiplexer
The invention discloses an ADC (Analog to Digital Converter) circuit adopting a single-ended conversion successive approximation structure. The ADC circuit comprises a capacitive conversion array, a common-mode voltage storage capacitor, a common-mode voltage input end, a comparator, an SAR (Successive Approximation) control logic and a multiplexer switch, wherein upper pole plates of all capacitors are connected together, and lower pole plates are respectively connected to a plurality of input sources through a multi-way analog selector switch; the multiplexer switch is connected to a negative end of an input signal and a negative end of reference voltage, the SAR control logic controls the multiplexer switch, so that the lower pole plate of the common-mode voltage storage capacitor is connected to the negative end of the input signal in a sampling stage, and is connected to the negative end of the reference voltage in a conversion stage at the end of sampling. According to the ADC circuit, a system detuning problem caused by uneven signal and chip reference ground planes is effectively eliminated without increasing the cost of a chip and a system, so that accuracy of measurement is improved.
Owner:CHIPSEA TECH SHENZHEN CO LTD
Co-graduation surface full-spectrum target
InactiveCN101726358AGood effectEliminate dissonanceRadiation pyrometrySpectrometry/spectrophotometry/monochromatorsSplit linesOptical axis
The invention belongs to the technical field of photoelectronic imaging and testing and relates to a co-graduation surface full-spectrum target. The invention comprises a substrate, a multi-quadrant detector, an asterion hole and a graduation line, wherein the multi-quadrant detector is arranged in the region outside the graduation line of the substrate, the graduation line is the region dividing line of the multi-quadrant detector, the asterion hole is a through hole and arranged in the centre of the substrate, and the substrate is made of full-spectrum transmission materials, the gradation line is any graph with identification characteristics. The invention applies the materials capable of transmitting full-spectrum waveband to the substrate of a gradation plate, greatly reduces the influence of manual or mechanical regulation control conversion on measurement precision. The graduation plate is capable of realizing the integrated functions of visual, infrared and laser graduation targets, has the advantages of high precision, small volume and light weight, is free from imbalance, and can be applied to a full-spectrum multi-optical axis consistency detection system for realizing graduation collimation with high precision and without imbalance.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Switching converter and control circuit and method thereof
PendingCN110545039AImprove transient characteristicsImprove system stabilityDc-dc conversionElectric variable regulationEngineeringControl circuit
The invention discloses a switching converter and a control circuit and control method thereof. The control circuit comprises a ripple compensation module. According to a switching node voltage between a first switching tube and a second switching tube, a first driving signal of the first switching tube and a second driving signal of the second switching tube, the ripple compensation module generates a slope compensation signal and a direct current compensation signal, wherein the direct current compensation signal is a sampling signal of the slope compensation signal; a control circuit adoptsthe slope compensation signal to improve transient characteristics, and the direct current compensation signal is adopted to eliminate imbalance introduced by the ripple compensation module.
Owner:HANGZHOU SILAN MICROELECTRONICS
Self-calibration band-gap reference circuit and band-gap reference voltage self-calibration system and method
InactiveCN105824349AHigh precisionAdd offset adjustable functionElectric variable regulationAudio power amplifierEngineering
The present invention provides a self-calibration bandgap reference circuit, a bandgap reference voltage self-calibration system and method, the self-calibration bandgap reference circuit at least includes: a first voltage signal generation branch, a second voltage signal generation branch, a second voltage signal generation branch, an interchangeable switch, and an operational amplifier with adjustable offset. The self-calibration bandgap reference circuit of the present invention adds two interchangeable switches on the basis of the traditional bandgap reference circuit, and increases the offset adjustable function of the operational amplifier, and makes the offset adjustable operational amplifier through the two interchangeable switches The two input terminals of the circuit can input two voltage signals interchangeably, and the bandgap reference voltage can be calibrated by adjusting the offset voltage of the offset-adjustable operational amplifier. The self-calibrating bandgap reference circuit of the present invention has simple structure, can eliminate the offset of most operational amplifiers, and greatly improves the precision of the bandgap reference voltage.
Owner:上海巨微集成电路有限公司
Amplifier with ultralow direct current (DC) offset at input end and analog/digital (A/D) converter
ActiveCN103138760AEliminate DC OffsetQuality is not affectedAnalogue-digital convertersA d converterIntegrator
The invention relates to an amplifier with ultralow direct current (DC) offset at an input end and an analog / digital (A / D) converter. The amplifier with the ultralow DC offset at the input end comprises a chopped wave modulator, a sampling instrument, a correlated double sampling (CDS) instrument and an amplifying / integration unit which are connected in sequence. A chopped wave demodulator is arranged in a circuit behind the sampling instrument. The chopped wave modulator and the chopped wave demodulator are used for eliminating residual DC offset generated due to imperfection of the CDS instrument and the other circuit components. On the other hand, the CDS instrument can also eliminate residual DC offset of the chopped wave modulator and the chopped wave demodulator. Due to the fact that the chopped wave modulator and the chopped wave demodulator modulate the residual DC offset of the CDS instrument and other circuit components at the clock frequency of 2*ck_chop to generate high-frequency modulating signals, input signals and the modulating signals do not overlap in a frequency domain. Consequently, the modulating signals can be eliminated at a low-pass filter which is connected with an output end of the amplifier with the ultralow DC offset at the input end. Therefore, the purpose of eliminating the residual DC offset of sampling signals is achieved.
Owner:HALO MICROELECTRONICS CO LTD
CMOS image sensor with high pixel and high frame rate and image collecting method
ActiveCN104243867ASimple circuit structureReduce power consumptionTelevision system detailsColor television detailsCMOSPixel array
The invention relates to a CMOS image sensor with the high pixel and the high frame rate and an image collecting method. The CMOS image sensor comprises a pixel array part (101), an increment sigma delta DC array part (102), a digital correlation double-sampling part (103) and a buffer storage part (104) and further comprises a row coding unit part (105) and a column reading control circuit (106), wherein the pixel array part (101), the increment sigma delta DC array part (102), the digital correlation double-sampling part (103) and the buffer storage part (104) are sequentially connected, the signal output end of the row coding unit part (105) is connected with the control end of the pixel array part (101), the signal output end of the column reading control circuit (106) is connected with the control end of the buffer storage part, and the increment sigma delta DC array part (102) is connected with a voltage buffer (107) and a clock delaying and driving circuit (108).
Owner:HARBIN ENG UNIV
Interferometer used for spectrograph
The invention discloses an interferometer used for a Fourier transformation spectrograph. The interferometer comprises a spectroscope, a third plane mirror, a fourth plane mirror, a movable mirror and a fixed mirror, wherein the movable mirror and the fixed mirror are arranged on light beam paths between the spectroscope and the third plane mirror as well as between the spectroscope and the fourth plane mirror respectively. The movable mirror and the fixed mirror are designed to be of an integrated structure capable of synchronously swinging or rotating. The interferometer can fundamentally eliminate optical path detuning caused by movement errors of a movable mirror bracket and a fixed mirror bracket independent of the movable mirror bracket. The precision and stability of the interferometer in the Fourier transformation spectrograph are improved, and a larger optical path difference can be obtained under the same swinging or rotating angle.
Owner:TIANJIN TONGYANG TECH DEV
Integrating pre-circuit of reading circuit in infrared focal plane array detector
ActiveCN103234642AEliminate dissonancePyrometry using electric radation detectorsAudio power amplifierVoltage regulation
An embodiment of the invention discloses an integrating pre-circuit of a reading circuit in an infrared focal plane array detector. The integrating pre-circuit comprises a first operational amplifier, a second operational amplifier, a bridge branch and an output offset branch. The output offset branch comprises a digital-to-analog converter, a first transistor, a second transistor and an adjustable resistor. An output end of the digital-to-analog converter is connected to a gate of the first transistor. A drain of the first transistor is connected to a source of the second transistor. A source of the first transistor is connected to a system power supply. A drain of the second transistor is grounded through the adjustable resistor. A gate of the second transistor is connected to offset voltage. The drain of the first transistor is further connected to a same-phase input end of the first operational amplifier through a second resistor. The voltage input to the same-phase input end of the first operational amplifier can be adjusted to the expected value by adjusting a digital-to-analog conversion circuit and the adjustable resistor, so that maladjustment of the whole integrating pre-circuit is eliminated and the integrating pre-circuit is allowed to output the ideal value.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Analog quantity conditioning and distributing device with high precision and all-digital calibration
ActiveCN102929321ASmall temperature coefficientLittle affected by temperatureElectric variable regulationInstrumentation amplifierAudio power amplifier
The invention discloses an analog quantity conditioning and distributing device with high precision and all-digital calibration, which comprises an instrumentation amplifier, an isolation amplifier, a verification module and an output drive module, wherein the instrumentation amplifier is used for receiving and treating field signals; the isolation amplifier is used for receiving the field signals processed by the instrumentation amplifier and then performing isolation output on the field signals; the verification module is used for receiving and verifying the signals output by the isolation amplifier; the output drive module is used for receiving the signals from the verification module and outputting the signals to a corresponding system; the verification module is connected with a general calibration device which is used for verifying the field signals output by the verification module; the general calibration device comprises an upper computer controlling the verification process and a calibration instrument controlled by the upper computer to generate standard voltage and current signals and transferring the standard voltage and current signals to the verification module; the upper computer is connected with the verification module through an SPI (serial peripheral interface); and the output drive module is connected with the calibration instrument. According to the invention, a digital potentiometer is adopted to replace a mechanical potentiometer, and the digital potentiometer is operated to change value of resistance through the SPI, so that detuning and linear error of the analog quantity conditioning and distributing device can be eliminated.
Owner:CHINA TECHENERGY +1
Dynamic comparator and method of imbalance calibration thereof
ActiveCN108011635AEliminate dissonanceLow offsetAnalogue/digital conversion calibration/testingCapacitanceControl switch
The present invention discloses a dynamic comparator and a method of imbalance calibration thereof. The dynamic comparator comprises: a latch and a pre-amplifier comprising a pre-amplification circuitand a calibration auxiliary circuit; the calibration auxiliary circuit comprises a charge storage capacitor storing an imbalance voltage, a charging and discharging switch, a common mode switch, a first calibration control switch and a second calibration control switch; and the input end of the dynamic comparator is connected in series with the charge storage capacitor, and the imbalance calibration is performed through control of the charging and discharging switch, the common mode switch, the first calibration control switch and the second calibration control switch.
Owner:SANECHIPS TECH CO LTD
Charge matching-based offset correction method of full-symmetric four-terminal dynamic comparator
ActiveCN104320139AHigh precisionEliminate dissonanceAnalogue/digital conversion calibration/testingCapacitanceEngineering
The invention discloses a charge matching-based offset correction method of a full-symmetric four-terminal dynamic comparator. The charge matching-based offset correction method includes the following steps that: a comparator is controlled to come into an offset correction state according to clock signals, reset signals and correction signals; common-mode electric level signals are inputted into the input end of the comparator; and an adjustable capacitor connected with the output end of the comparator is controlled, so that the output positive and negative end charges of the comparator can be matched under the effect of the adjustable capacitor, wherein the adjustable capacitor can be formed through short circuiting of the source and the drain of an NMOS transistor. With the charge matching-based offset correction method of the full-symmetric four-terminal dynamic comparator of the invention adopted, influence of floating nodes on the speed and accuracy of the comparator can be eliminated, and offset caused by various factors in the dynamic comparator can be eliminated, and circuit accuracy can be improved. The invention also provides a charge matching-based offset correction system of the full-symmetric four-terminal dynamic comparator.
Owner:TSINGHUA UNIV
High-accuracy fully differential capacitance-voltage conversion circuit system
ActiveCN109669054AReduce Harmonic DistortionSuppression of common mode interferenceAcceleration measurementAccelerometerEngineering
The invention relates to the field of MEMS (Micro Electro Mechanical System) inertial devices, in particular to a high-accuracy fully differential capacitance-voltage conversion circuit system. The high-accuracy fully differential capacitance-voltage conversion circuit system comprises a driving signal generation part, a fully differential charge amplifier and capacitance compensation arrays. A whole conversion circuit and a sensor sensitive structure still adopt an output mode in single-ended connection, and a fully differential circuit structure is realized through time division multiplexing; a circuit adopts a switch capacitance structure for removing the influence of parasitic capacitance, main signal channels adopt a correlated double sampling technology for removing low-frequency noise and detuning, the capacitance compensation array is capable of correcting the detuning and non-linearity of the sensor sensitive structure. According to the high-accuracy fully differential capacitance-voltage conversion circuit system disclosed by the invention, the influence of the parasitic capacitance can be effectively inhibited, common-mode interference generated by switch charge injection and substrate noise can be reduced, harmonic distortion of the circuit is reduced, the linearity of an accelerometer system is increased, and zero drift is inhibited.
Owner:HARBIN ENG UNIV
CMOS image sensor structure for realizing predictive coding image compression
InactiveCN103957365AImprove efficiencyReduce power consumptionTelevision system detailsColor television detailsImage compressionLinear predictive coding
The invention relates to the integrated circuit design field of microelectronics and the digital image coding compression field. According to the technical scheme, a CMOS image sensor structure for realizing predictive coding image compression is used for achieving the purposes that on the basis of no reduction of image sensing quality, the area and power consumption introduced in due to a predictive coding module which is additionally used are reduced, predictive coding is completed while an image is acquired, and disorder caused by an operational amplifier in the coding process is eliminated. The CMOS image sensor structure is characterized in that firstly, a pixel value read from a pixel array is transmitted to a correlated double-sampling circuit to be subjected to correlated double-sampling so that fixed-pattern noise can be eliminated, then, a predictive coding circuit carries out predicted value obtaining operation under control of a sequential circuit, a column-level subtracter is used for obtaining the difference, namely a residual value, between the predicted value and an original pixel value after the predicted value is obtained, and finally, the residual value is subjected to analog-digital conversion to obtain final output codes. The CMOS image sensor structure for realizing predictive coding image compression is mainly applied to integrated circuit design.
Owner:TIANJIN UNIV
Self-calibrated 12 bit SAR ADC structure and self-calibration method thereof
InactiveCN109150181AEliminate dissonanceAnalogue/digital conversion calibration/testingCapacitanceLower pole
The invention discloses a self-calibrated 12 bit SAR ADC structure and a self-calibration method thereof, and belongs to the technical field of analog to digital conversion. The structure includes a self-calibrating capacitor array, a selective switch S [6 : 0], a comparator, a voltage divider resistor string, a register and two logic control modules. A lower pole plate of the self-calibrating capacitor array is connected to the negative end of the comparator or common mode level V<COM>, and an upper pole plate is connected to input voltage V<REF> or V<SS> through a selective switch S [6 : 4];a lowest capacitor upper pole plate is connected to the voltage divider resistor string by selecting a voltage dividing coefficient through a selective switch S [3 : 0]; the output end of the comparator is connected to the register; and the register is connected to the two logic control modules. The self-calibration method of the 12 bit SAR ADC structure is also provided, so that the imbalance ofthe comparator can be precisely eliminated, the imbalance can be presented in the form of calibration codes, the internal imbalance voltage of the comparator can be calculated according to the calibration codes, and whether the magnitude of the imbalance can be accepted and the imbalance is completely eliminated can be judged.
Owner:CHINA KEY SYST & INTEGRATED CIRCUIT
Circuit for reducing residual offset of integrated hall sensor
ActiveCN104931077AEliminate dissonanceSimple structureConverting sensor output electrically/magneticallyElectric variable regulationSignal conditioning circuitsClosed loop
The invention discloses a circuit for reducing the residual offset of an integrated hall sensor. The circuit employs rotating current modulation and high-pass filtering, and enables offset and low-frequency 1 / f noise, which are generated by a hall device, to be eliminated in advance, and then further eliminates hall offset through a subsequent demodulation circuit. Therefore, the circuit is stronger in capability of eliminating the hall device offset. A signal demodulated by the hall sensor is enabled to be modulated into a high-frequency signal through a feedback modulator, and the high-frequency signal serves as a feedback signal and is transmitted to a difference-difference amplifier for amplification along with a hall signal outputted by a rotating current modulator, thereby forming a closed-loop signal conditioning circuit, and further reducing the residual offset caused by the signal conditioning circuit. The circuit is simple in structure, is easy to achieve circuit integration, cannot increase the manufacture cost, and can obtain low residual offset.
Owner:南京奇霍科技有限公司
Floor heating system employing heat pump for supplying hot water
InactiveCN1912476AExpand the variable rangeEliminate slow performanceLighting and heating apparatusEnergy efficient heating/coolingLow speedProcess engineering
The problem to be solved in the invention is that, although a direct hot-water supply type is being considered in order to reduce size and weight in a heat pump hot-water supply floor heating device having a floor heating function at the same time, the difference between necessary heating capability in a hot-water supply operation and that in a floor heating operation is large, it can not be handled by conventional control of the number of revolutions of a compressor, and, in particular, separation, loss of synchronism, noise and the like of a compression mechanism part are generated in a low-speed operation in the floor heating operation. This heat pump hot-water supply floor heating device of the invention is solved the conventional problem by executing a heat pump operation in using hot water, by adding a floor heating function to a direct hot-water supply type heat pump water heater for directly supplying heating water to a used terminal, and by skillfully using control of the number of revolutions and capacity control as a control method of a compressor in response to a situation.
Owner:HITACHI APPLIANCES INC +1
Current rotating circuit applied to Hall sensor
ActiveCN104571246AStable operating pointGuaranteed growthElectric variable regulationMOSFETParasitic capacitance
The invention discloses a current rotating circuit applied to a Hall sensor. According to the circuit, interference of a turn-on resistance and a parasitic capacitance of an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switching tube in the current rotating circuit on the circuit can be eliminated and an output common-mode voltage of the circuit is stabilized. The circuit has a simple structure and high reliability and can be widely applied to the Hall sensor to carry out current rotation of a Hall signal so as to eliminate detuning. The current rotating circuit disclosed by the invention is mainly applied to an integrated 2D (two-dimensional) Hall sensor.
Owner:ZHUHAI ZHONGRUI SCI & TECH CO LTD
Hall switch offset voltage elimination method
InactiveCN107483036AEliminate dissonanceEliminate individual differencesElectronic switchingTransmission gateSwitching signal
The invention provides a Hall switch offset voltage elimination method. The method comprises a Hall sensing area, wherein a constant current is accessed in the Hall sensing area, four groups of switch signals that are not overlapped with each other are accessed in the Hall sensing area in four directions, the Hall sensing area converts a magnetic field signal into a voltage signal of an induced electromotive force, the voltage signal uses four groups of switch clock signal to control a transmission gate and a differentiate amplifier to obtain a first amplification signal and a second amplification signal, and the four groups of switch signal average the first amplification signal and the second amplification signal so as to eliminate difference of the Hall voltages in four directions. Offset voltages in four directions of 360 degree are eliminated fully, a chopper amplifier is adopted for amplification so as to eliminate offset voltage caused by the circuit, so that offset voltage is eliminated finally, and a stable magnetic field flip point is obtained.
Owner:WUXI LINLI SCI & TECH CO LTD
Optical receiver, active optical cable, and control method for optical receiver
InactiveCN108322265AEliminate dissonanceAmplifiers controlled by lightDifferential amplifiersAudio power amplifierTransimpedance amplifier
Owner:FUJIKURA LTD
Fully differential amplifier circuit with high accuracy and high dynamic range
PendingCN106330104AEliminate dissonanceCancel noiseAmplifier modifications to reduce noise influenceAmplifier modifications to raise efficiencyOxide semiconductorIntegrated circuit
The invention discloses a fully differential amplifier circuit with high accuracy and a high dynamic range. The overall circuit mainly comprises an operational amplifier input grade, an operational amplifier middle grade, an operational amplifier output grade and a common-mode feedback module and belongs to the field of integrated circuits. In order to improve the accuracy and the dynamic performance of the circuit, the circuit is combined with a folding type cascode operational amplifier structure adopting a chopper technique and an AB type push-pull structure; however, the AB type push-pull circuit requires a floating voltage source to provide static polarization, the cascading number of cascode circuits is increased, and the voltage margin is limited; besides, even if all MOS (metal oxide semiconductor) transistors in the cascode circuits are modulated to the normal work zone, the work sections of the cascode circuits are very limited, and the robustness of the circuit is easily affected by transient pulse and PVT change; the cascode type current source of the cascode grade is changed into a two-transistor self-cascading type current source in order to solve the problem, and the voltage margin of the circuit is improved while the circuit accuracy is guaranteed.
Owner:湘潭芯力特电子科技有限公司
Engine controller
InactiveCN101078378AImprove drivabilityEliminate dissonanceHybrid vehiclesElectrical controlBrake torqueRoad surface
Owner:HITACHI LTD
Hall-effect gear tooth sensor IC (integrated circuit)
ActiveCN102879019AWide operating voltage rangeEliminate dissonanceConverting sensor output electrically/magneticallyComparators circuitsRadio frequency
The invention relates to a Hall-effect gear tooth sensor IC, which is used in the fields of distance detection, speed detection, rotation speed detection and so on. The Hall-effect gear tooth sensor IC comprises a reverse protection circuit, a voltage stabilizing circuit and a signal processing circuit, wherein the reverse protection circuit is connected with a power supply; and the signal processing circuit is provided with a pin C+ and a pin C-. The signal processing circuit is characterized in that the signal processing circuit consists of a Hall voltage generator, a differential amplifier, a band-pass filter, a hysteresis comparator circuit, a open-collector output stage, a grounding wire and necessary connection circuits, wherein the Hall voltage generator, the differential amplifier, the band-pass filter, the hysteresis comparator circuit and the open-collector output stage are connected in sequence. The Hall-effect gear tooth sensor IC provided by the invention is simple in size, convenient in use, and has the advantages of high sensitivity, high reliability, high resistance to vibration, radio frequency and electromagnetic interference, and good consistency.
Owner:上海鑫雁微电子股份有限公司
CMOS fully-integrated electromagnetic detection radio frequency front-end sensor
PendingCN113567761AGood symmetryImprove consistencyElectromagentic field characteristicsMagnitude/direction of magnetic fieldsCMOSHemt circuits
The invention discloses a CMOS fully-integrated electromagnetic detection radio frequency front-end sensor, which comprises a Hall sensor, a rotating current circuit, an instrument operational amplifier, a low-pass filter and a clock processing circuit, and is characterized in that the rotating current circuit is used for eliminating electromagnetic induction imbalance of the Hall sensor; the instrument operational amplifier is used for improving the load capacity of the circuit; the low-pass filter is used for realizing RC low-pass filtering of the circuit; and the clock processing circuit is used for outputting a high-level non-overlapped waveform clock, so that the influence caused by simultaneous conduction of the switches in the rotating current circuit is prevented. The CMOS technology is adopted, full integration of electromagnetic sensing is achieved, the sensor can be inserted between channels on the premise that the radio frequency performance is not affected, the chip area is not increased, cost is saved, and detection of the electromagnetic intensity between radio frequency front-end circuits is achieved.
Owner:成都通量科技有限公司
High-sensitivity vertical magnetic field sensor with symmetrical structure
ActiveCN110736942ASimple production processHigh magnetic field sensitivityGalvano-magnetic hall-effect devicesGalvano-magnetic device manufacture/treatmentGate dielectricCondensed matter physics
The invention discloses a high-sensitivity vertical magnetic field sensor with a symmetrical structure. The magnetic field sensor comprises a first vertical magnetic field sensor and a second verticalmagnetic field sensor, which are vertically and symmetrically arranged, wherein the first vertical magnetic field sensor and the second vertical magnetic field sensor share a third N + region. The magnetic field sensor comprises a silicon substrate, an insulator layer, a first P-region, a second P- region, a third P- region, a fourth P- region, a first N + region, a second N + region, a third N +region, a fourth N + region, a fifth N + region, a gate dielectric layer and a gate. The magnetic field sensor with the symmetrical structure has a simple production process, a completely symmetricalstructure and low initial device offset, furthermore, the device offset can be eliminated by using the rotating current technology, and the residual offset is low. The vertical magnetic field sensorhas high magnetic field sensitivity, and can form a two-dimensional magnetic field sensor to realize the detection of a two-dimensional magnetic field parallel to a device plane.
Owner:NANJING UNIV OF POSTS & TELECOMM
All-wireless distributed active electrode system for human physiological signal acquisition
InactiveCN110897632AAvoid impedanceHigh common mode rejection ratioSensorsTelemetric patient monitoringConvertersTransceiver
The invention belongs to the technical field of analog circuit signal processing, and particularly relates to an all-wireless distributed active electrode system for human physiological signal acquisition. The all-wireless distributed active electrode system comprises a bioelectrode, an instrument amplifier, an analog-to-digital converter, a transmitter, a receiver, a digital-to-analog converter,a common-mode detection module and a common-mode feedback amplifier which are in circuit connection in sequence; the bioelectrode, the instrument amplifier, the analog-to-digital converter and the transmitter are integrated to form an active electrode, and human body common-mode signals acquired by the active electrode are fed back to a right leg driving electrode through a transceiver to form a wireless common-mode feedback structure, so that impedance and gain mismatch of the active electrode are inhibited, and the common-mode rejection ratio of the whole system is increased. According to the invention, all-wireless transmission distributed human body physiological signal acquisition is finally realized by using the active electrode and a wireless common-mode feedback form.
Owner:FUDAN UNIV
Eight-phase current rotating circuit for Hall sensor
ActiveCN107317576AEliminate dissonanceThe technical scheme of dynamic offset cancellation is simplePower consumption reductionVoltage/current interference eliminationPhase currentsOffset cancellation
The invention provides an eight-phase current rotating circuit for a Hall sensor, and discloses an eight-phase current rotating circuit based on the current output mode and a dynamic offset cancellation method for the eight-phase current rotating circuit. The eight-phase current rotating circuit is composed of 32 NMOS transistors, wherein 16 NMOS transistors with the same size control the input and output directions of a bias current, and the other 16 NMOS transistors with the same size control the output polarity of a Hall signal and an offset signal. The eight-port Hall device with a 45-degree rotational symmetry structure is controlled by an eight-phase sequence clock to conduct eight-phase current rotating operation to output the Hall signal of which the polarity does not change and the offset signal of which the polarity changes. The dynamical offset cancellation technical scheme is simple, the circuit is easy to achieve, and by outputting the offset signal of which the polarity changes and the Hall signal of which the polarity does not change in the eight-phase current rotating modulation process and by means of follow-up current integration amplification and sampling / keeping and subtracting operation, offset of the Hall device can be effectively cancelled, and very low residual offset can be achieved.
Owner:NANJING UNIV OF POSTS & TELECOMM
A High Precision Fully Differential Capacitance-Voltage Conversion Circuit System
ActiveCN109669054BReduce Harmonic DistortionSuppression of common mode interferenceAcceleration measurementHemt circuitsEngineering
The invention relates to the field of MEMS (Micro Electro Mechanical System) inertial devices, in particular to a high-accuracy fully differential capacitance-voltage conversion circuit system. The high-accuracy fully differential capacitance-voltage conversion circuit system comprises a driving signal generation part, a fully differential charge amplifier and capacitance compensation arrays. A whole conversion circuit and a sensor sensitive structure still adopt an output mode in single-ended connection, and a fully differential circuit structure is realized through time division multiplexing; a circuit adopts a switch capacitance structure for removing the influence of parasitic capacitance, main signal channels adopt a correlated double sampling technology for removing low-frequency noise and detuning, the capacitance compensation array is capable of correcting the detuning and non-linearity of the sensor sensitive structure. According to the high-accuracy fully differential capacitance-voltage conversion circuit system disclosed by the invention, the influence of the parasitic capacitance can be effectively inhibited, common-mode interference generated by switch charge injection and substrate noise can be reduced, harmonic distortion of the circuit is reduced, the linearity of an accelerometer system is increased, and zero drift is inhibited.
Owner:HARBIN ENG UNIV
Low-noise current fine adjustment reference source
ActiveCN104536501ARemove offset and noiseCancel noiseElectric variable regulationNegative feedbackLow noise
The invention discloses a low-noise current fine adjustment reference source. The reference source comprises an operational amplifier OPAMP, a resistor R1 and a resistor R2. The ends of the resistor R1 and the resistor R2 are connected with the output end VOUT of the operational amplifier OPAMP respectively. The other end of the resistor R1 is connected with a negative feedback enable node INP of the operational amplifier OPAMP. The other end of the resistor R2 is connected with a negative feedback enable node INN of the operational amplifier OPAMP. The resistor R1 and the resistor R2 are connected in series to be connected with an emitter of a PNP type bipolar transistor Q1 and then grounded. The resistor R2 is connected with an emitter of a PNP type bipolar transistor Q2 and then grounded. Resistors R3, R4 and R5 are added on the resistor R1 current branch. Resistors R4, R6 and R8 are added on the resistor R2 current branch, and fine adjustment of the resistor R1 and the resistor R2 is completed through control signals CON1, CON2 and CON3. A chopping module MOD is arranged on the resistor R1 and resistor R2 current branch, and by switching the current on the R1 and R2 passage dynamically, noise and detuning of the current can be eliminated.
Owner:SUZHOU VOCATIONAL UNIV
Analog quantity conditioning and distributing device with high precision and all-digital calibration
ActiveCN102929321BSmall temperature coefficientLittle affected by temperatureElectric variable regulationInstrumentation amplifierAudio power amplifier
The invention discloses an analog quantity conditioning and distributing device with high precision and all-digital calibration, which comprises an instrumentation amplifier, an isolation amplifier, a verification module and an output drive module, wherein the instrumentation amplifier is used for receiving and treating field signals; the isolation amplifier is used for receiving the field signals processed by the instrumentation amplifier and then performing isolation output on the field signals; the verification module is used for receiving and verifying the signals output by the isolation amplifier; the output drive module is used for receiving the signals from the verification module and outputting the signals to a corresponding system; the verification module is connected with a general calibration device which is used for verifying the field signals output by the verification module; the general calibration device comprises an upper computer controlling the verification process and a calibration instrument controlled by the upper computer to generate standard voltage and current signals and transferring the standard voltage and current signals to the verification module; the upper computer is connected with the verification module through an SPI (serial peripheral interface); and the output drive module is connected with the calibration instrument. According to the invention, a digital potentiometer is adopted to replace a mechanical potentiometer, and the digital potentiometer is operated to change value of resistance through the SPI, so that detuning and linear error of the analog quantity conditioning and distributing device can be eliminated.
Owner:CHINA TECHENERGY +1
On-chip Hall Signal Amplifier and Method Based on Chopper Second-Order Compensation
ActiveCN107093989BImprove linearityEliminate dissonanceAmplifier modifications to reduce temperature/voltage variationAmplifier with semiconductor-devices/discharge-tubesChopperSwitching frequency
An on-chip Hall signal amplifier based on chopper second-order compensation, comprising: a signal input module for providing a Hall non-inverting input signal and an inverting input signal; a chopper connected to two output terminals of the signal input module A wave modulation module, configured to modulate and output the positive-phase input signal and the reverse-phase input signal; a clock module, used to provide switching frequency and modulation frequency for the chopping modulation module; and the chopping modulation module The op-amp module connected to the two output terminals is used to amplify the output signal of the chopper modulation module; it also includes a second-order compensation module connected to the output terminal of the op-amp module and a clock module, which is used to adjust the op-amp The output signal of the module is compensated and fed back to the inverting input terminal of the operational amplifier module. Compared with the prior art, the invention can effectively eliminate the offset in the whole temperature range, and improve the linearity of the output signal through the second-order compensation.
Owner:NINGBO CRRC TIMES TRANSDUCER TECH CO LTD
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