14 results about "Capacitive feedback" patented technology

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.

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.

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.

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.

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.

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.

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.