45results about "Charge amplifiers" patented technology

A control device (100) for controlling a number N, with N ≥ 1, of actuators (200) for actuating N optical elements (310) of an optical system (300), comprising a control node (K2) coupling to the actuator (200) for providing a control voltage (V2) for the actuator (200), and an amplifier (110) configured to receive a supply voltage (V1) provided at an input node (K1) and to provide an output voltage (V3) at an output node (K3), wherein the amplifier (110) comprises a plurality M, with M ≥ 2, of current sources (111, 112) comprising at least one controlled current source (112) and a holding capacitor (113) for maintaining the level of the provided output voltage (V3), wherein the controlled current source (112) comprises a transistor (114), whose gate terminal can be controlled by an adjustable first control signal (S1),and has an adjustable resistor (115) coupled to the transistor (114).

A readout circuit (110) is proposed. The readout circuit (110) is configured to convert an analog sensor charge (112) into a digital output count (114). The readout circuit (110) comprises at least one integrate and fire (IAF) circuit (116). The IAF circuit (116) is configured to convert the analog sensor charge (112) into a first digital output count (118). An analog voltage residue (120) after the last IAF cycle is further processed. The readout circuit (110) includes at least one analog-to-digital converter (ADC) (122). The ADC (122) is configured to convert the analog voltage residue (120) into a second digital output (124). Furthermore, the input charge to the readout circuit is a photodetector (182), and a method of readout of the analog sensor charge (112) is proposed.

Disclosed in the present invention is a floating inverter amplifier based on capacitor stacking, which boosts a power supply of the floating inverter amplifier to 2 times VDD by means of the capacitor stacking; under such condition, a transistor in the inverter may be better turned on, and a cascode structure can be applied to an inverting amplifier operating at a low power supply voltage. Furthermore, an ADC system employing the floating inverter amplifier of the present invention can process an input signal with a common-mode voltage of VDD and an amplitude up to 2 times VDD, which effectively addresses a problem of a reduced input signal amplitude under an ultra-low voltage, thereby increasing a signal-to-noise ratio of the system.

To provide a switched capacitor type amplifier which does not need a reference voltage source.SOLUTION: A switched capacitor type amplifier comprises: an operational amplifier including two input and output terminals of a positive polarity and a negative polarity; a first capacitive element connected between a voltage input terminal and the input terminal of the negative polarity of the operational amplifier; a second capacitive element connected between the input terminal and the output terminal of the negative polarity of the operational amplifier; a switch element for accumulating electric charge corresponding to a voltage of the voltage input terminal in the first capacitive element in a first phase; and a switch element for moving the electric charge accumulated in the first capacitive element to the second capacitive element in the second phase. In the switched capacitor type amplifier, the operational amplifier includes a pair of differential input transistors and a pair of load elements connected in series with the pair of differential input transistors. The input terminal of the positive polarity is connected to a reference potential point, and the pair of load elements is set to be different resistance values.SELECTED DRAWING: Figure 1

The invention relates to a piezoelectric measuring device (100) comprising a sensor element (10) which generates a measurement signal (M) for a pressure to be measured, a conductor element (13) for deriving the measurement signal (M) to a data acquisition device (12), which data acquisition device (12) is configured to acquire and evaluate the derived measurement signal (M), wherein the sensor element (10) comprises an operational amplifier (20) which has an inverting input and an output, a feedback capacitor (22) which is arranged in parallel to the inverting input and output of the operational amplifier (20), and a reset switching element (27) arranged in parallel to the inverting input and output of the operational amplifier (20), wherein the data acquisition device (12) is further configured toto provide an electrical supply voltage (U) for the sensor element (10), wherein the data acquisition device (12) has a measurement cycle circuit (35) configured to switch on the electrical supply voltage (U) for the sensor element (10) before the start of a measurement cycle and to switch it off after completion of the measurement cycle; and that the sensor element (10) has a power-on reset logic (25, 26) configured to detect the presence of the electrical supply voltage (U) and, if the electrical supply voltage (U) is present before the start of a measurement cycle, closes and reopens the reset switching element (27).

To provide a switched capacitor amplifier and a battery monitoring device that uses a telescopic type fully differential amplifier to significantly reduce output errors caused by common mode noise and achieve a high CMRR.SOLUTION: A telescopic type fully differential amplifier 14b includes an input portion 20 including input a transistor M1-M2. A bias generating portion 21 generates a bias Vbn1. A cascode portion 22 is cascode-connected to the input portion 20 of the fully differential amplifier 14b and applies the bias Vbn1 to the cascode portion 22. The bias generating section 21 generates the bias Vbn1 so as to depend on the source potentials of the input transistor M1-M2.SELECTED DRAWING: Figure 2

Device for operating a passive infrared (PIR) detector with a first connection (IN) and a second connection (IP), the device comprising: - an electrical circuit arrangement (R G ), wherein the electrical circuit arrangement (R G ) forms a leakage resistance between the first terminal (IN) and the second terminal (IP) of the passive infrared detector (PIR) to discharge the first terminal (IN) and the second terminal (IP) of the passive infrared detector (PIR); wherein the electrical circuit arrangement (R G ) includes a switch-capacitor circuit with transfer gates and storage capacities; and the device is set up for this purpose: - the transfer gates of the electrical circuit arrangement (R G) to switch alternately with a first clock (φ1) and a second clock (Φ2), and to advance a charge quantity by one node with each half-clock using the storage capacities, whereby the first clock (φ1) and the second clock (Φ2) do not overlap and, apart from the non-overlap, the first clock (φ1) is the inverse of the second clock (Φ2); and - to switch off the first clock (φ1) and the second clock (Φ2) during a measurement phase, so that the device is in a measurement state and the charge flow through the electrical circuit arrangement (R G ) is prevented.

A circuit includes an amplifier, a bias voltage node, and a first set of switches configured, based on a first reset signal being asserted, to couple amplifier input nodes to the bias voltage node and to short-circuit amplifier output nodes. First and second feedback branches each include a respective circuit network including parallel capacitors, with first ones of the capacitors directly connected to the amplifier input nodes. The first and second feedback branches further include a second set of switches intermediate the amplifier input nodes and second ones of the capacitors, and a third set of switches intermediate amplifier output nodes and the capacitors. These switches selectively couple the capacitors to the amplifier input and output nodes, based on a second reset signal being asserted. The second reset signal is asserted for a time interval exceeding a time interval in which the first reset signal is asserted.

Provided is a weak-signal reading circuit for a sensor, comprising a sensing signal input amplifying unit and a signal reading unit. The sensing signal input amplifying unit comprises a first transistor, wherein a gate and a drain of the first transistor are connected with a sensor; the signal reading unit is connected to a source of the first transistor, the first transistor is turned on when the sensor generates a sensing signal, so that the sensing signal is captured by the signal reading unit. When the sensor senses a signal and generates a voltage, the first transistor tends to be switched on, then the signal reading unit reads the sensing signal through the first transistor which has been turned on, that is, by providing the first transistor, the weak-signal reading circuit for sensor can be self-driven according to the voltage generated by the sensor without an extra drive circuit, thereby achieving low power consumption.

The utility model provides a built-in IEPE circuit used for a piezoelectric type shock wave pressure sensor, comprising a high gain amplifier, a feedback capacitor and a constant current source, the high gain amplifier is composed of an N channel enhanced field effect transistor, a P channel enhanced field effect transistor, a resistor R1, a resistor R2, a feedback resistor R3 and a resistor R4, the two ends of the high-gain amplifier are connected with the constant current source, the positive electrode of the constant current source is an output end, and the constant current source is connected to the P-channel enhanced field effect transistor; the piezoelectric sensor sensitive element is connected with the input end and receives a charge signal generated by the piezoelectric sensor sensitive element through the input end; the feedback capacitor is installed between the input end and the output end to form negative feedback to form a charge amplifying circuit, a small number of electronic components are used for constructing a complete IEPE circuit, and the charge amplifying circuit has the advantages of being high in integration level, small in size and high in anti-interference capacity and can be integrated in a sensor to amplify charge signals.

The present invention increases the output voltage of a switching amplifier in a situation where the power supply voltage is limited. The switching amplifier includes first and second switches that are turned on and off in a complementary manner, and a capacitance, both ends of which serve as inputs to a power combiner. Both ends of the capacitance are connected to output ends of the first and second switches. The capacitance is supplied with power along with the operation of the first and second switches. As a result, an electric charge in the capacitance is used as a charge pump, and is used alternatingly for boosting or stepping down the output voltage depending on the operation frequency of the switching amplifier, thereby generating a rectangular voltage with a controlled wave height.

The utility model belongs to the technical field of charge signal processing, and particularly relates to a multiple-adjustable charge amplifier circuit, which comprises a low-pass filter circuit, an integral negative feedback amplification circuit, a high-pass filter circuit, a voltage amplification circuit and a double-T-shaped wave trap circuit, wherein the low-pass filter circuit is used for filtering a high-frequency signal of a charge signal; the integral negative feedback amplification circuit is used for converting the charge signal into a charge voltage signal; the high-pass filter circuit is used for filtering low-frequency signals; the voltage amplifying circuit is used for amplifying the charge voltage signal; the double-T-shaped wave trap circuit is used for filtering power frequency interference. The charge amplifier solves the problems that the amplification factor of the charge amplifier is adjustable, the impedance of the charge amplifier is large, and the charge amplifier is easily interfered by power frequency radiation or other noises.

A charge amplifier circuit (10) for a capacitive sensing arrangement (80), the charge amplifier circuit (10) including: an first amplifier stage (20) including a first amplifier input (22), a second amplifier input (23) connectable to the capacitive sensing arrangement (80), and including a first amplifier output (24) and a second amplifier output (25), a second amplifier stage (30) including a first amplifier input (32), a second amplifier input (33), a first amplifier output (34) and a second amplifier output (35), and a switched capacitor arrangement (40) between the first amplifier stage (20) and the second amplifier stage (30), the switched capacitor arrangement (40) including a first integration capacitor (42), a second integration capacitor (43), a number of first switches (66, 67) and a number of second switches (68, 69).

A capacitive sensing charge amplifier, e.g., in a direct current (DC) feedback network, may incorporate a switching capacitor, including a first control switch and a second control switch, which receives a switching signal to charge and discharges the switching signal to a virtual ground of a sense amplifier. Noise incorporated into the output of the sense amplifier (e.g., a MEMS output signal) is filtered by a demodulation signal at a demodulator such that the period average noise at the demodulator output equals zero. The time varying nature of the switching capacitor resistance generally reshapes the system's post-demodulation noise to reduce its low frequency output noise.

The application discloses a high-count-rate bipolar dynamic adjustable charge amplification circuit structure and a use method thereof. The high-count-rate bipolar dynamic adjustable charge amplification circuit structure comprises a current attenuator, a charge-sensitive preamplifier, an adaptive leakage current compensation circuit and an SPI module. The current attenuator is used for reversing and attenuating an input negative charge signal. The charge-sensitive preamplifier is used for integrating and amplifying an obtained external positive charge signal or a positive charge signal output by the current attenuator. The adaptive leakage current compensation circuit is used for compensating a leakage current injected into an input end of the charge-sensitive preamplifier due to introduction of the current attenuator. The SPI module is connected with the current attenuator to control selection gears of the current attenuator. Therefore, the high-count-rate bipolar dynamic adjustable charge amplification circuit structure can complete high-precision charge measurement of each gear in a full dynamic range through the charge-sensitive preamplifier, the current attenuator and the adaptive leakage current compensation circuit, can effectively reduce area overhead while ensuring precision, and is convenient for multi-channel integration.

The invention relates to a readout circuit and a readout chip of a detector. The readout circuit comprises at least one readout channel, and the readout channel comprises a charge sensitive pre-amplification circuit which is connected with a detector and is used for amplifying a charge signal output by the detector and outputting an initial voltage signal; the active shaping filter circuit is connected with the charge sensitive pre-amplification circuit and is used for receiving a control signal, carrying out filtering shaping processing on an initial voltage signal under the action of the control signal and outputting a shaping signal; the time constant of the active shaping filter circuit is regulated and controlled by the control signal; and the screening circuit is connected with the active shaping filter circuit and is used for receiving a preset voltage signal, comparing the shaping signal with the preset voltage signal and outputting a digital level signal according to a comparison result. The reading circuit has the advantage of being high in reading precision.

This application provides a signal processing circuit and an electronic device. The signal processing circuit includes: a charge amplifier circuit for receiving a differential charge signal output from a sensor; amplifying and converting the differential charge signal to output a first voltage signal; a non-inverting amplifier circuit connected to the charge amplifier circuit for receiving the first voltage signal; amplifying the first voltage signal to output a second voltage signal; a voltage-controlled filter circuit connected to the non-inverting amplifier circuit for receiving the second voltage signal; amplifying and filtering the second voltage signal to output a third voltage signal; and a hysteresis comparator circuit connected to the voltage-controlled filter circuit for receiving the third voltage signal and comparing it to obtain a stable square wave signal. The solution provided in this application can effectively suppress common-mode noise signals, has a fast response speed, is less affected by circuit impedance, and produces a better square wave signal output.

A detection signal processing apparatus configured to process detection signals received from a detector for identifying the presence of one or more substances of interest in a sample, the apparatus comprising: a detection signal coupling arranged to receive detection signals from said detector; an amplifier and an integration capacitor, the amplifier having inputs, with at least one input being connected to the detection signal coupling; and ringing circuitry capacitively coupled to at least one of the inputs of the amplifier and being selectively operable to apply a ringing signal to said at least one of the inputs of the amplifier to cause amplifier protection circuitry of the amplifier to reset the integration capacitor.

The embodiment of the invention relates to a charge amplification circuit and method. A circuit includes an amplifier, a bias voltage node, and a first set of switches configured to couple first and second input nodes to the bias voltage node and couple first and second output nodes of the amplifier based on a first reset signal having a first value. The first and second feedback branches each include a respective RC network that includes a plurality of capacitances. The first and second feedback legs also include a second set of switches intermediate the input node and the capacitors and a third set of switches intermediate the input node and the plurality of capacitors. The switches selectively couple the capacitance to the input node and the output node based on a second reset signal having the first value. The second reset signal maintains the first value for a determined time interval exceeding a time interval in which the first reset signal has the first value.

Disclosed herein are low-power event-driven pixels with active differential detection circuitry and reset control circuitry for the same. In one embodiment, an event-driven pixel includes a photosensor; a photo-current / voltage converter coupled to the photosensor; and a differential circuit coupled to the photo-current / voltage converter. The differential circuit includes a source follower transistor and is configured to generate a signal at a gate of the source follower transistor based on a voltage output from the photo-current / voltage converter. The differential circuit is further configured to output a differential signal in response to an assertion of a row select signal. The event-driven pixel can further include a reset control circuit coupled to the differential circuit and configured to initialize the differential circuit and reset the differential circuit when the differential signal output from the event-driven pixel indicates a change in the voltage greater than a threshold amount.

The invention relates to a piezoelectric measuring device (100) comprising a sensor element (10) which generates a measurement signal (M) for a pressure to be measured, a conductor element (13) for deriving the measurement signal (M) to a data acquisition device (12), which data acquisition device (12) is configured to acquire and evaluate the derived measurement signal (M), wherein the sensor element (10) comprises an operational amplifier (20) which has an inverting input and an output, a feedback capacitor (22) which is arranged in parallel to the inverting input and output of the operational amplifier (20), and a reset switching element (27) arranged in parallel to the inverting input and output of the operational amplifier (20), wherein the data acquisition device (12) is further configured toto provide an electrical supply voltage (U) for the sensor element (10), wherein the data acquisition device (12) has a measurement cycle circuit (35) configured to switch on the electrical supply voltage (U) for the sensor element (10) before the start of a measurement cycle and to switch it off after completion of the measurement cycle; and that the sensor element (10) has a power-on reset logic (25, 26) configured to detect the presence of the electrical supply voltage (U) and, if the electrical supply voltage (U) is present before the start of a measurement cycle, closes and reopens the reset switching element (27).

The invention provides a two-wire system low bias voltage temperature drift amplification circuit and a detection system, and the circuit comprises an impedance conversion module which achieves the conversion from a high internal resistance alternating charge signal to a low internal resistance voltage signal through a field effect transistor; the constant current bias-voltage clamping module forms a voltage clamp through a Darlington tube and a Zener diode, and establishes stable direct current bias by means of a resistor, so that the circuit can stably work in a relatively wide driving current and working temperature range; and the gain adjustment-high-frequency signal suppression module adopts an RC first-order low-pass filter, realizes adjustment of voltage gain through an adjusting resistor, and combines an output signal with a constant current source to form two-wire system signal output, thereby realizing composite superposition of signal voltage and direct-current bias voltage. A two-wire system working mode is adopted, the structure is simple, the number of needed components is small, miniaturization integration is easy, and long-distance stable work can be achieved in the 175 DEG C high-temperature environment.

The invention relates to a piezoelectric measuring device having a sensor element for generating a measurement signal for a pressure to be measured and a conductor element for conducting the measurement signal to a data detection device which detects and analyses the conducted measurement signal; the sensor element includes: an operational amplifier having an inverting input terminal and an output terminal; the feedback capacitor is arranged in parallel with the inverting input end and the inverting output end of the operational amplifier; the reset switch element is arranged in parallel with the inverting input end and the inverting output end of the operational amplifier; the data detection device is configured to supply a supply voltage to the sensor element, the data detection device having a measurement period circuit configured to switch on the supply voltage of the sensor element before the start of a measurement period and to switch off after the end of the measurement period; and the sensor element has a power-on reset logic configured to detect the presence of the supply voltage and, in the presence of the supply voltage, close and open the reset switching element again before the start of the measurement period.

A detection signal processing device configured to process a detection signal received from a detector for identifying the presence of one or more target substances in a sample, the device comprising: a detection signal coupling arranged to receive a detection signal from the detector; an amplifier and an integrating capacitor, the amplifier having input terminals, at least one of which is coupled to the detection signal; and a ringing circuit capacitively coupled to at least one input of the amplifier and selectively operable to apply a ringing signal to the at least one input of the amplifier to cause an amplifier protection circuit of the amplifier to reset the integrating capacitor.

To provide an amplifier or the like which consumes less current and has a lower offset than a conventional technique.SOLUTION: A control circuit of a dynamic amplification device connects a load circuit and a current source to a differential amplifier, short-circuits and then opens each input terminal and each inverting output terminal of the differential amplifier, and holds each input voltage and an error of the differential amplifier in each sampling capacitor. A sampling operation of canceling an error of the differential amplifier, a reset operation of disconnecting the load circuit and the current source and connecting each inverting output terminal to a fixed potential, and an amplification operation of amplifying a difference between input voltages after the sampling operation by connecting the differential amplifier to the current source, setting each inverting output terminal of the differential amplifier to a high impedance, and integrating each output capacitor of the differential amplifier by either charging or discharging according to each input voltage of the differential amplifier are executed.SELECTED DRAWING: Figure 2

The application discloses a kind of based on multi-chip splicing's detector and signal processing method related to the technical field of synchrotron radiation and X-ray spectroscopy, detector includes: detector array module includes a plurality of semiconductor detection chips arranged on substrate, to seamlessly splicing mode arrangement forms continuous detection surface, for converting received incident radiation signal into charge signal;Packaging module is used to provide temperature control and environmental isolation for detector array module Working environment;Readout circuit module is electrically connected to detector array module, for preamplification to the charge signal output by detector array module and conversion into voltage signal;Digital signal processing module is used for digital processing to voltage signal, and is configured with parallel processing logic respectively for executing pulse pile-up discrimination and energy extraction processing.The surface array detector and signal processing method can realize stable collection and high-precision energy information acquisition of incident radiation signal under high count rate conditions.

Safety circuit (SC) coupled between a first DC circuit (POW1) and a second DC circuit (POW2), wherein the first DC circuit (POW1) supplies current to the second DC circuit (POW2), the safety circuit (SC) comprising: - a first series circuit between positive poles of the first and second DC circuits (POW1, POW2), wherein the first series circuit comprises a first diode (D1) with an anode coupled to the first DC circuit (POW1) and a cathode coupled to a first terminal of a first controllable switch (S1) and a second diode (D2) with an anode coupled to a second terminal of the first controllable switch (S1) and a cathode coupled to the second DC circuit (POW2), - a second series connection between the negative poles of the first and second DC circuits (POW1, POW2), wherein the second series connection comprises a third diode (D3) with an anode coupled to the second DC circuit (POW2) and a cathode coupled to a second terminal of a second controllable switch (S2) and a fourth diode (D4) with an anode coupled to a first terminal of the second controllable switch (S2) and a cathode coupled to the first DC circuit (POW1), - a first energy storage device (C1) coupled between the positive pole of the second DC circuit (POW2) and the first terminal of the second controllable switch (S2), - a second energy storage device (C2) coupled between the negative pole of the second DC circuit (POW2) and the first terminal of the first controllable switch (S1), - a first feedback circuit that provides a first feedback signal (S _F ) to indicate an active state of the first controllable switch, and - a second feedback circuit that provides a second feedback signal (S _F ) to indicate an active state of the second controllable switch (S2).

An amplification circuit and a charge bootstrapped amplification circuit, the amplification circuit having a first output and a second output, and comprising a first charge bootstrapped amplifier, a second charge bootstrapped amplifier, a first switch, and a second switch. The first charge bootstrapped amplifier comprises a first input, a second input, a first capacitor, and a second capacitor to amplify a first input signal during a first operation period. The second charge bootstrapped amplifier comprises a third input, a fourth input, the first capacitor, and the second capacitor to amplify a second input signal during a second operation period. The first capacitor and the second capacitor are charged during the first operation period, and the first capacitor and the second capacitor are discharged during the second operation period.

It is described a charge preamplifier (200) comprising: an input terminal (IN) for receiving a charge signal (Iin) generated by a radiation sensor (300) and an output terminal (OUT) for an electrical output signal (Vout); an amplifier (1; S1) configured to operate from the charge signal (Iin) to provide the electrical output signal (Vout); a feedback capacitor (Cf) connected to the input terminal (IN) and the output terminal (OUT); a discharge circuit (DSC) including a discharge component (SW; Rf) configured to cause a discharge of the feedback capacitor (Cf). The discharge circuit (DSC) further comprises an electronic device (ED) connected to the discharge component (SW; RE) and configured to: allow a charge and discharge of the feedback capacitor (Cf) and a variation of the electrical output signal (Vout) according to the charge signal (Iin); add, at least during the discharge of the feedback capacitor (Cf), a constant voltage value (Vadj) to a continuous electrical voltage present at the output terminal (OUT).

The invention provides a vortex shedding flowmeter signal processing circuit and a control method thereof, and the method comprises the steps: receiving a charge signal through a single-end input charge processing module, converting the charge signal into a voltage signal, and obtaining a first voltage; the signal adjusting module amplifies the first voltage, the amplification gain is adjustable, a second voltage is obtained, the filtering frequency band of the second-order filtering module is adjusted, the second voltage is filtered according to the adjusted filtering frequency band, and a target voltage is obtained. According to the signal processing circuit, the single-end input charge processing module which is simple in structure and high in anti-interference capacity is adopted, the positive electrode of the circuit is directly connected with a reference point, it is avoided that the anti-interference capacity is reduced due to the fact that the common-mode rejection effect of the circuit is affected by the environment and elements, and the anti-interference capacity of the circuit is improved; the amplification factor of the whole circuit is adjustable, the filtering frequency band can be adjusted according to actual conditions, the precision and accuracy of target signals are improved, and the application range of the vortex shedding flowmeter is wider.