26 results about "Capacitive feedback" patented technology

The invention provides an analog amplifier circuit based on capacitance feedback, which relates to the technical field of signal processing, and comprises a positive voltage local voltage stabilization module, an amplifier module, a bias module and a negative voltage local voltage stabilization module, the positive voltage local voltage stabilization module, the bias module and the negative voltage local voltage stabilization module are all connected with the amplifier module; the positive voltage local voltage stabilization module is used for providing a first stable power supply for the amplifier module; the amplifier module is used for receiving a to-be-amplified signal input externally, performing signal amplification on the to-be-amplified signal to obtain an amplified signal, and outputting the amplified signal; the signal amplification is realized based on a transistor and a feedback capacitor in the amplifier module; the bias module is used for providing first bias voltage for the amplifier module; the negative voltage local voltage stabilization module is used for providing a second stable power supply for the amplifier module. The driving requirement and energy consumption of the amplifier are reduced by adopting capacitance feedback, the energy efficiency of the amplifier circuit is improved, signal amplification is realized through the transistor, and the amplifier circuit with a small area is realized.

The present application relates to the field of integrated circuits and photoelectric detection technology, in particular to a low-noise hybrid domain CMOS detector readout circuit.The circuit includes a capacitance feedback transimpedance amplification unit, a switched capacitor reference unit, an analog domain readout unit, a time domain quantization unit and an output selection unit.The transimpedance amplification unit converts the pixel current into voltage.The switched capacitor reference unit filters out the reference voltage noise in the reset stage and maintains the reference potential in the integration stage.The analog domain readout unit outputs analog voltage, and the time domain quantization unit outputs digital time code through saturation time detection.The output selection unit defaults to output analog signal, and switches to digital output when the transimpedance amplifier output voltage reaches the preset threshold.The present application also provides a corresponding readout method.The present application can effectively filter out the reference voltage source noise and power supply ripple, significantly improve the signal-to-noise ratio of micro-light detection, realize high dynamic range in a single frame, significantly expand the linear response range of the detector, and can be integrated on chip.

The invention discloses an intelligent automobile headlamp based on electromagnetic-capacitive feedback adjustment. The intelligent automobile headlamp comprises a bulb, a rotating sleeve shell, a rotating support, a sliding rod, an electromagnetic driving assembly, a capacitive sensing assembly and a main control unit. The electromagnetic driving assembly comprises a horizontal electromagnetic driving unit and an axial electromagnetic driving unit, and the sliding rod is driven to axially move or the rotating sleeve shell is driven to horizontally rotate through electromagnetic force; the capacitance sensing assembly comprises a first capacitance sensing unit and a second capacitance sensing unit, and the driving displacement is fed back in real time in a non-contact mode by detecting the capacitance value formed by the change of the opposite area of the first capacitance sensing unit and the second capacitance sensing unit. Compared with the prior art, the system is simple in structure, rapid in response and high in control precision, and the driving safety is remarkably improved.

The invention discloses a transimpedance amplification circuit and a photoelectric signal detection system. The transimpedance amplification circuit is applied to a photodiode and comprises a bootstrap input stage and a capacitance feedback transimpedance amplification stage. The bootstrap input stage comprises a bootstrap amplifier and a first coupling capacitor; the in-phase input end of the bootstrap amplifier is connected with the cathode of the photodiode, and the output end is connected with the anode of the photodiode through the first coupling capacitor to form bootstrap feedback. The capacitance feedback transimpedance amplification stage at least comprises a first-stage integral amplification circuit, and the input end of the first-stage integral amplification circuit is connected with the cathode of the photodiode. According to the circuit, approximately equal-amplitude in-phase voltage changes are generated at the two ends of a parasitic capacitor of a photodiode through bootstrap feedback, the shunt effect of the parasitic capacitor is effectively inhibited, and the noise gain of a system is reduced; and meanwhile, the integral amplification circuit directly performs high-bandwidth conversion on the current signal, so that the high-speed processing capability is guaranteed. According to the circuit, noise performance is remarkably improved while high bandwidth and high sampling rate are maintained, and collaborative optimization of high bandwidth, high sampling rate and low noise is achieved.

This application belongs to the field of semiconductor device analysis and specifically discloses a stability analysis method and system for SiC MOSFETs. The method includes: determining the parasitic parameters of the SiC MOSFET; combining the parasitic parameters to obtain the feedback transfer functions of two feedback loops in the SiC MOSFET switching transient; the two feedback loops include: an inductive feedback loop and a capacitive feedback loop; the feedback transfer functions of the two feedback loops are respectively expanded in the complex frequency domain to determine the gate-source voltage changes introduced by the two feedback loops; the gate-source voltage changes include: amplitude gain changes and phase changes; when the sum of the gate-source voltage changes does not exceed a preset threshold, the SiC MOSFET is in a stable state; otherwise, the SiC MOSFET is in an unstable state. Through this application, a concise and clear analysis method for SiC MOSFET switching stability is provided, providing technical guidance for maximizing the performance of SiC MOSFETs.

The application discloses a kind of superconducting single-photon imaging circuit and method based on capacitance feedback, adopt lens and optical fiber as optical alignment system, the light to be measured from outside is converged to superconducting nanowire single-photon detector (abbreviation SNSPD) photosensitive area;Array superconducting nanowire single-photon detector is used as photoelectric converter, and the light signal is detected and converted into electrical signal;Imaging circuit based on capacitance feedback transimpedance amplifier (abbreviation CTIA) is used, and the electrical signal of each pixel response of array SNSPD is integrated respectively, and the integral voltage of response is obtained, finally, according to the integral voltage value of each pixel of array SNSPD, a gray scale image is obtained.

The invention relates to a capacitance feedback type current detection amplifier circuit, which comprises an operational amplifier, a feedback capacitor, a load capacitor, a reset switch, a first capacitor, a second capacitor, a first change-over switch and a second change-over switch, reference voltage is input to the in-phase input end of the operational amplifier, the output end of the operational amplifier is connected with the second end of the feedback capacitor and the first end of the load capacitor, the reset switch is connected with the feedback capacitor in parallel, the second end of the load capacitor is grounded, and the second end of the first capacitor is grounded. The second end of the second capacitor is selectively connected to the in-phase input end of the operational amplifier or the first change-over switch through the second change-over switch, and the first end of the first capacitor is selectively connected to the output end of the operational amplifier or the second change-over switch through the first change-over switch. According to the invention, the influence of noise random sampling values on the circuit can be suppressed.

The utility model discloses an X-wave band driving amplifier which is provided with three stages of amplification paths, the first two stages of amplification paths are provided with feedback loops, and the feedback loops are formed by connecting a blocking capacitor, a feedback resistor and a feedback inductor in series and can adjust gain, restrain distortion and compensate high-frequency phase shift. And each stage of amplification path provides stable direct current bias for the transistor through an active bias circuit, a gate / drain filter capacitor and a choke inductor. The radio frequency transmission circuit integrates a pi-type attenuator, a blocking capacitor and a matching inductor / capacitor to realize impedance matching and signal amplitude adjustment. The transistor is grounded in a low-impedance mode through a grounding ground hole, high-frequency interference is reduced, stable broadband gain, high P1dB and high stability are achieved through multi-stage negative feedback, power supply filtering and a matching network, efficient signal transmission and anti-interference capacity are achieved, and the high-frequency broadband amplifier is suitable for a high-frequency scene. The problems of gain fluctuation, distortion and insufficient stability of a traditional amplifier in a broadband are solved, and the amplifier has the advantages of being compact in structure and high in practicability.

The application discloses an improved VSG control method suitable for transient power angle suppression and voltage support, and the method comprises the following steps: obtaining a power angle reference value δ* and an internal potential reference value E*, and generating a reference voltage of VSG control; wherein the power angle reference value δ* is obtained by using a P-f control link according to an active power given value P e 0, an active electromagnetic power P e 0 and an angular frequency rated value ω0; the internal potential reference value E* is obtained by using a Q-U control link according to a reactive power given value Q0, a reactive electromagnetic power Q t 0 and a voltage rated value E0; if a voltage sag fault occurs in a power grid, at least one of scheme one and scheme two is used; wherein the scheme one comprises inputting a virtual resistance feedback link to the P-f control link to realize power angle compensation; the scheme two comprises inputting a virtual capacitor feedback link to the Q-U control link to realize output voltage compensation. The application can suppress power angle divergence and improve voltage support capability under the condition of considering fault current limiting.

The embodiment of the application discloses a hybrid type cascode field effect transistor with internal Miller capacitor feedback, and is applied to the technical field of electronic circuits.In the hybrid type cascode field effect transistor with internal Miller capacitor feedback, when a low-voltage field effect transistor and a first high-voltage field effect transistor are cascaded, a second high-voltage field effect transistor is additionally arranged between the gate and the drain, so that the equivalent Miller capacitor of the second high-voltage field effect transistor is arranged between the gate and the drain, and the switching speed of the hybrid type cascode field effect transistor with internal Miller capacitor feedback can be effectively adjusted.

This disclosure provides a capacitor-to-voltage conversion device, comprising: a charge integration module including a first operational amplifier, a feedback capacitor, and a third switch; a sample-and-hold module including a third capacitor, a fourth capacitor, a fifth capacitor, a second operational amplifier, and multiple switches; one end of the fifth capacitor is connected to the other end of the third capacitor, and the other end of the fifth capacitor is connected to the output terminal and the non-inverting input terminal of the second operational amplifier respectively through two switches; the fourth capacitor is connected across the output terminal and the inverting input terminal of the second operational amplifier; the non-inverting input terminal of the second operational amplifier is also connected to a reference voltage input terminal; at least one adjustable capacitor compensation module, each adjustable capacitor compensation module including multiple parallel capacitor branches, each capacitor branch including a compensation capacitor and an adjustment switch; wherein, one or more of the detection capacitor and feedback capacitor of the detection sensor are adjustable capacitor compensation modules.

A circuit includes a first capacitance array formed by n nominally equal capacitive elements. A first electrode of each capacitive element is coupled, via respective switches to either a reference voltage or ground. A differential amplifier has a first input coupled to an output of a first capacitance array, a second input grounded, and an output generating a voltage ramp. A capacitive feedback circuit couples the output of the differential amplifier to the first input. A second capacitance array has an output coupled to the first input of the differential amplifier. The capacitive elements of the first capacitance array are organized in sets. The circuit operates by controllably coupling, set by set, second electrodes of the capacitive elements of the first capacitance array to the first input of the differential amplifier.

This application discloses a circuit and its control method for enhancing the input impedance of a chopper amplifier. The circuit includes an OTA operational amplifier module, a chopper module, an input capacitor, a feedback capacitor, a peak detector, a valley detector, a subtractor, a comparator integrator, and a variable capacitor. The method includes: acquiring a differential input signal and performing chopping and amplification processing to obtain an output signal; performing peak detection processing to obtain positive and negative peak voltages; performing subtraction calculations to obtain the peak-to-peak value of the OTA signal; performing integration and ripple filtering processing to obtain a DC voltage signal with amplitude information; converting it into a DC current signal with amplitude information, and performing current compensation on the differential input signal through a positive feedback loop. The embodiments of this application can accurately compensate for on-chip parasitic capacitances, thereby avoiding current draw from the signal source and enhancing the input impedance of the chopper capacitor-coupled instrumentation amplifier. This application can be widely applied in the field of analog integrated circuit design technology.

The invention provides a multi-type MEMS Fabry-Perot filter chip closed-loop feedback control circuit and method, and relates to the technical field of intelligent optical electromechanical system control, a Fabry-Perot filter chip is installed on a circuit board, the Fabry-Perot filter chip comprises a substrate, a fixed mirror and a movable mirror which are stacked in sequence, and a Fabry-Perot cavity is formed between the fixed mirror and the movable mirror; the movable mirror is provided with a driving electrode and at least one feedback electrode, and the closed-loop feedback control circuit comprises a microprocessor module, a communication module, a capacitance detection module and a driving module which are arranged on a circuit board. A microprocessor module is used for controlling a driving module to output adjustable driving voltage to a driving electrode to drive a movable mirror to move, cavity length changes are obtained in real time through capacitance detection, the driving voltage is dynamically adjusted in combination with a control model, driving control and capacitance feedback detection are deeply fused, accurate tuning of the center wavelength is achieved, and the purpose of accurate tuning of the center wavelength is achieved. The cavity parallelism is monitored and adjusted, and the modulation precision, stability and environmental adaptability of spectrum output are effectively improved.

A continuous time single drive capacitance-to-voltage (C2V) converter can be employed for single sensor, balanced single sensor, or differential sensor. First sensor and / or second sensor can be employed to sense a condition. A capacitive bridge can comprise a first capacitive digital-to-analog-converter (DAC) and second capacitive DAC as a differential node. First capacitive DAC can be associated with first sensor, and second capacitive DAC can be associated with a third capacitive DAC, in series with first sensor, if single sensor is implemented or the second sensor if balanced single sensor or differential sensor is implemented. Capacitive bridge can be connected to differential input of a capacitive feedback amplifier that can be a continuous time amplifier with no signal sampling and no noise folding. Capacitive feedback amplifier can comprise capacitively coupled input common mode feedback, which can remove noise from a sensor drive, and output common mode feedback.

A capacitive feedback two-stage lever MEMS security device with a fusing lock pin device comprises a lower security chip and an upper security chip connected with the lower security chip, and motion of a silicon baffle is controlled by an electric heating actuator to realize control of detonation energy; meanwhile, multiple mechanisms are arranged to improve the overall rigidity of the device, and the possible failure condition of the device due to the fact that the partition plates are burst open is avoided; in addition, a feedback function is introduced, and real-time feedback of the working state of the MEMS security device is realized by measuring capacitance. The system has the advantages of being intelligent, safe and miniaturized.

This invention discloses a low-noise amplifier based on an inverter and its multi-objective optimization method, including an inverter and an input capacitor C. I Feedback capacitor C F And a single-stage operational amplifier. An inverter consists of a PMOS transistor and an NMOS transistor connected in series, with an input capacitor C. I and feedback capacitor C F All amplifiers use a split capacitor structure. The positive input of the single-stage operational amplifier is connected to the output of the inverter, the negative input is connected to the reference voltage, and the output is connected to the gate of the NMOS transistor through resistor R2. At the same time, the gate of the PMOS transistor is connected to resistor R1, and the resistance values ​​of R1 and R2 are equal. This improves the stability and noise performance of the amplifier circuit. A multi-objective optimization design method is used to optimize the design parameters of the low-noise amplifier to meet the amplification requirements of ultrasonic pulse echo signals of different frequencies, thereby improving design efficiency.

The embodiment of the present disclosure provides an adaptive tracking tunable harmonic rejection amplifier, which is applied to the technical field of electronic circuits; the amplifier comprises an input port, a first amplifier, a harmonic filter, a second amplifier, a coupling capacitor, a feedback module, an output port closed loop architecture, the input port receives an external input signal, the first amplifier performs preliminary amplification, then the harmonic filter performs harmonic suppression, and the second amplifier performs re-amplification and then outputs, the feedback module generates a control signal according to the output signal, so as to adjust the parameters of the control end of the harmonic filter, and realize wideband harmonic suppression of the signal; through low gain fluctuation, the stability of signal amplification is ensured; through the feedback module, the harmonic component is detected in real time and the filtering parameter is regulated and controlled, dynamic tracking suppression of the harmonic is realized, manual intervention is not needed, and signal transmission loss and chip layout occupation area are greatly reduced.

The invention discloses a multimode band-pass analog baseband circuit, which comprises a first part circuit, a second part circuit and a third part circuit which are connected in sequence, after a group of differential signals are input into the analog baseband circuit, the differential signals are processed by the first part circuit, the second part circuit and the third part circuit, and processed pure signal waveforms are output; the first part circuit comprises a capacitive feedback program control gain high-pass filter which is used for high-pass filtering and achieving regulation and control of high-pass filtering cut-off frequency and bandwidth. The second part circuit comprises a two-stage programmable gain fully-differential amplifier with a multi-loop high-pass feedback technology, and is used for band-pass filtering and gain and order adjustability; the third part circuit comprises a fourth-order low-pass filter used for low-pass filtering. The method is suitable for a silicon-based process platform, the order, the bandwidth and the gain of the filter can be dynamically adjusted through program control to realize switching of various working frequency modes of the analog baseband, and the method can be applied to various different communication standards or use scene requirements.

Steering wheel grip sensor, comprehensive: a controlled electrode that has a flat shape and extends along a rim of a steering wheel; a sensor electrode that has a flat shape and is located opposite the controlled electrode; a sine wave generator that supplies a sinusoidal voltage to the controlled electrode; a charge amplifier comprising a capacitive feedback element, detects a change in the amount of charge generated according to the capacitance of the sensor electrode, and outputs the change in the amount of charge as a change in voltage; a multiplication processor that multiplies the sine wave voltage by an output voltage of the charge amplifier; an integrator that smooths the result of multiplication by the multiplication processor using integration; and a grip detector that determines, according to a level of the smoothed result, whether the steering wheel is being gripped, wherein the sine wave generator receives a square wave signal and generates the sine voltage in synchronization with the square wave signal, the steering wheel handle sensor further includes a storage facility; a first analog-to-digital (AD) converter that performs an A / D conversion of the output voltage of the charge amplifier in synchronization with the square wave signal and stores a result of the A / D conversion as the first digital data in the memory; and a second A / C converter that performs an A / C conversion of the sine wave voltage from the sine wave generator in synchronization with the square wave signal and stores the result of the A / C conversion as second digital data in the memory, wherein the first A / D converter and the second A / D converter generate the first digital data and the second digital data respectively, wherein the first digital data and the second digital data each correspond to at least two cycles of a waveform of the sinusoidal voltage.

This disclosure provides a five-port isolation error amplifier and its transmitting circuit and isolation power supply, including a detection circuit, a bias current generation circuit, an oscillation circuit, a feedback coupling capacitor, a feedback rectifier circuit, a feedback filter circuit, and a feedback adjustment circuit. The detection circuit detects the input voltage and outputs a detection current. The bias current generation circuit generates a bias current positively correlated with the detection current. The oscillation circuit generates a target oscillation signal with an amplitude positively correlated with the bias current. The feedback coupling capacitor couples and transmits the target oscillation signal. The feedback rectifier circuit rectifies the oscillation-coupled feedback signal to obtain a feedback rectified output voltage. The feedback filter circuit filters out the ripple in the feedback rectified output voltage to obtain a first DC voltage. The feedback adjustment circuit converts the first DC voltage into a feedback current positively correlated with it to shunt the detection current. It can replace the optocoupler in the isolation feedback scenario 1:1 and can also improve the accuracy of signal isolation transmission.

According to one aspect, an ambient light sensor is proposed comprising: - a photodiode (PHD) configured to generate an electrical signal based on ambient light, - a capacitive feedback transimpedance amplifier (CTIA) connected at the input of the photodiode (PHD) to receive a signal generated by the photodiode and to generate at the output an amplified signal from the signal generated by the photodiode (PHD), - a self-zero switch (AZS) at the input of the capacitive feedback transimpedance amplifier, and - a control circuit (CC) comprising a trigger circuit (CA) configured to: ○ receive an initial control logic signal (AZB_X) with a positive or zero voltage, then ○ generate, from this initial control logic signal, a matched control logic signal (AZ_SHIFT) having a first positive voltage level and a second negative voltage level to control the self-zero switch (AZS). Figure for the abstract: Fig 1

The invention discloses an automatic pre-tightening force loading control method for a piezoelectric stack driver based on capacitance feedback. The method is characterized by comprising the following steps: firstly, establishing a capacitance value-pre-tightening force mapping model of the piezoelectric stack driver; an automatic pre-tightening force loading mechanism is installed on application equipment of the piezoelectric stack driver, and automatic loading of initial pre-tightening force is carried out; the capacitance value of the piezoelectric stack driver is automatically detected in the gap of the work cycle of the piezoelectric stack driver, and the pre-tightening force value of the piezoelectric stack driver in the gap of the work cycle is obtained through the mapping model; judging whether the pre-tightening force value is in a normal range or not, and if the pre-tightening force value deviates from the normal range and is in an early warning range, automatically adjusting the pre-tightening force until the pre-tightening force value is in the normal range; if the pre-tightening force value deviates from the normal range and is in the dangerous range, alarming and stopping; the device has the advantages that the measurement result of the pre-tightening force is accurate and reliable, so that the control of the pre-tightening force is accurate and reliable; the piezoelectric stack driver is prevented from being damaged due to improper pre-tightening force; the service life of the piezoelectric stack driver is prolonged, and the stability of each period in long-term operation is guaranteed.

The present invention proposes a dynamic vision sensor chip switched capacitor amplifier based on a pseudo-resistance switch, which is used in the fields of machine vision, unmanned driving, etc., and includes an input capacitor, a feedback capacitor, an operational amplifier, and a pseudo-resistance switch. The pseudo-resistance switch includes a reset switch P-type metal oxide semiconductor (PMOS) tube and one or more parallel N-type metal oxide semiconductor (NMOS) tube groups, or includes a reset switch NMOS tube and one or more parallel PMOS tube groups, and a MOS tube group includes two MOS tubes connected in series and using a diode connection. The pseudo-resistance switch of the present invention can provide a current that is equal in magnitude and opposite in direction to the leakage current of the reset switch, and exhibits a large equivalent impedance between the negative input terminal and the output terminal of the switched capacitor amplifier, and reduces the equivalent inductance of the output terminal of the switched capacitor amplifier, effectively improving the reliability and accuracy of the output data of the dynamic vision sensor chip.

The application relates to a method for realizing double-channel laser cutting height adjustment control based on a capacitive sensor, which comprises the following steps: dynamically creating a channel space; selecting a channel height adjustment mode and providing a channel mode selection interface to an upper computer; in a step distance planning mode, independently planning in the respective channel space; in an automatic following mode, independently feeding back capacitive data according to the current position of a cutting head obtained through capacitive feedback; dynamically adjusting a target position; and performing height adjustment output control through the difference between the current position of the cutting head and the height adjustment target position. The application also relates to a device for realizing double-channel laser cutting height adjustment control based on a capacitive sensor, a processor and a storage medium. The method, the device, the processor and the computer readable storage medium for realizing double-channel laser cutting height adjustment control based on a capacitive sensor solve the problems of single machining scene and low cutting efficiency caused by single-channel cutting.

The application discloses a pre-tightening force automatic loading control method of a piezoelectric stack driver based on a capacitor feedback, characterized in that a capacitor value-pre-tightening force mapping model of the piezoelectric stack driver is first established; a pre-tightening force automatic loading mechanism is installed on an application device of the piezoelectric stack driver to automatically load an initial pre-tightening force; the capacitor value of the piezoelectric stack driver is automatically detected in a gap of a working cycle, and the pre-tightening force value of the piezoelectric stack driver in the gap of the working cycle is obtained through the mapping model; whether the pre-tightening force value is in a normal range is judged, if the pre-tightening force value deviates from the normal range and is in a pre-warning range, the pre-tightening force is automatically adjusted until the pre-tightening force is in the normal range; if the pre-tightening force value deviates from the normal range and is in a dangerous range, an alarm is given and the piezoelectric stack driver is stopped; the method has the advantages that the measurement result of the pre-tightening force is accurate and reliable, the control of the pre-tightening force is accurate and reliable, the piezoelectric stack driver is prevented from being damaged due to improper pre-tightening force, the service life of the piezoelectric stack driver is prolonged, and the stability of each cycle in long-term operation is ensured.