80 results about "Sample and hold" patented technology

The invention provides a real-time electroencephalogram phase locking closed-loop stimulation method and system, and relates to the technical field of electroencephalogram signal processing. The method comprises the following steps: firstly, acquiring a cortex electrical activity signal and establishing a baseline statistic, then carrying out causal band-pass filtering on the signal, and carrying out sampling and holding substitution in a stimulation artifact window; setting an amplitude and a duration threshold based on the baseline, and performing phase judgment after conditions are met; estimating an average period through zero crossing and calculating an instantaneous phase; outputting a trigger instruction when the three-point crossing judgment is established; and outputting stimulation under the constraint of charge balance and a safety limit value, setting a minimum prohibition period and link abnormity suppression, and recording a hit rate and a response rate for quality evaluation. According to the method, through causal phase estimation, artifact isolation and a schedulable triggering mechanism, the high hit rate of non-stationary signal phase locking stimulation is achieved, and the safety and effectiveness of a stimulation system are ensured.

Systems, devices, and methods are provided for pulsed strain gauge topologies. A weight sensor assembly may comprise one or more load cells for receiving excitation pulses during a first state period of a duty cycle, sample and hold (S / H) circuitry connected to the one or more load cells that holds analog measurement signals from the one or more load cells, first filtering circuitry connected to the S / H circuitry for processing the analog measurement signals and producing a DC level signal, an amplification system connected to the filtering circuitry, for amplifying the DC level signal, second filtering circuitry connected to the amplification system for filtering power line noise, and analog-to-digital (ADC) circuitry connected to the second filtering circuitry. Examples of load cells described herein include full-bride load cells (FBLCs) and half-bridge load cells (HBLCs).

A photoelectric conversion apparatus comprises a pixel region where pixels are arranged in a matrix, a sample hold circuit configured to sample and hold, as a first signal and a second signal, two different signals output from each of two pixels in the pixel region, and an analog-digital conversion circuit configured to perform analog-digital conversion of the second signals from the two pixels after performing analog-digital conversion of the first signals from the two pixels. A time interval between a period set to perform analog-digital conversion of the first signals from the two pixels and a period set to perform analog-digital conversion of the second signals from the two pixels is set longer than a time interval between periods set to perform analog-digital conversion of each of the first signals from the two pixels.

The present application relates to aerospace, geological exploration and micro-light detection fields, and particularly relates to a reconfigurable noise shaping successive approximation register analog-to-digital converter, which comprises a sampling unit, a capacitive digital-to-analog converter array, a comparison unit, a passive noise shaping feedback unit, a successive approximation control unit, an output unit and a mode control unit. The sampling unit samples and holds an input signal, and the capacitive digital-to-analog converter array outputs to the comparison unit. The comparison unit compares its output with a common-mode reference voltage, and the result is sent to the successive approximation control unit. In the noise shaping mode, the successive approximation control unit additionally generates an integral clock timing to activate the passive feedback unit, samples a residual voltage and feeds back to the digital-to-analog converter array. The output unit drives the conversion result to a lower circuit. The present application also contains a method. The present application can effectively suppress the capacitive parasitic effect and low-frequency noise, realize flexible switching between high-speed conventional mode and high-resolution noise shaping mode, and significantly improve the system performance.

A sample and hold circuit includes a sampling circuit including a first amplifier configured to amplify an input voltage to generate an amplification voltage, the sampling circuit configured to perform a sampling operation of sampling the amplification voltage. The sample and hold circuit also includes a holding circuit configured to perform a holding operation of setting an output voltage to a voltage level of the input voltage, based on the sampling operation and an amplification operation of a second amplifier.

A system and method for measuring mutual inductance between adjacent first communication transmission line and second communication transmission line is disclosed. The system includes a mutual inductance measurement circuit that includes a coupling generator which biases the first communication transmission line with a current ramp signal; a sample and hold circuit which captures an induced voltage on the second communication transmission line using a switched capacitor storage element; a switched capacitor integrator configured to integrate the induced voltage onto an output voltage node; and a comparator configured to switch states once the switched capacitor integration has surpassed a reference trippoint.

A sample and hold circuit includes a pixel level connection coupled to a pixel cell. In a voltage domain global shutter operation, a reset voltage and a signal voltage are sampled and stored in a reset capacitor and a signal capacitor sequentially. In readout, the stored signal voltage is read out first to a comparing circuit to determine the best gain factor for the analog to digital converter (ADC) circuit to fully utilize the conversion range of the ADC to achieve a better signal to noise ratio. Once the better gain is determined and set for the ADC by comparing the signal voltage with a pre-determined threshold voltage, the same signal voltage is converted directly to become a digital signal value by the ADC. Then, the stored reset voltage is converted to a digital reset value by the ADC without changing the gain factor, to shorten the readout time.

Reduce the time required from the start of the sample to the completion of outputting the converted data. [Solution] The successive approximation AD conversion circuit (1) comprises a sample-and-hold circuit (2) configured to sample and hold an analog input signal, a D / A converter (3) configured to convert a digital signal into an analog voltage, a comparator (4) configured to compare the output of the sample-and-hold circuit with the output of the D / A converter, and a control circuit (5) configured to generate the digital signal based on the output of the comparator and supply it to the D / A converter, determine each bit of the digital output signal based on the output of the comparator, and output the digital output signal serially in order from the determined bits.

An image sensor comprises: a plurality of sample-and-hold circuits that sample and hold a plurality of signals input from a plurality of different pixels; a plurality of converters that convert the signals held in the plurality of sample-and-hold circuits to currents corresponding to potentials of the signals, respectively; a switch that connects / disconnects the plurality of converters; and a plurality of output circuits wherein, in a case where the switch connects the plurality of converters, the currents converted by the plurality of converters are added and output from one of the plurality of output circuits, and, in a case where the switch disconnects the plurality of converters, the currents converted by the plurality of converters are output from the plurality of output circuits, respectively.

The invention relates to the technical field of optical communication, in particular to a test circuit and method for testing burst RSSI (Received Signal Strength Indicator) sampling hold time. By adjusting the delay time of the reset signal relative to the trigger signal, the time for completing the sampling process of the chip can be measured, so that whether the sampling and holding function of the chip is qualified or not is judged, and the blank that the specific sampling completion time of a plurality of sampling and holding chips cannot be tested is filled. During a chip mass production test or a chip verification test, whether the function of the sampling hold circuit is qualified or not can be tested more conveniently.

The invention relates to a sample and hold circuit with low droop rate for a battery power supply system. The sample and hold circuit may include an operational amplifier including a first operational amplifier input, a second operational amplifier input, and an operational amplifier output. The sample and hold circuit may also include a first switch connected between the first operational amplifier input and a power supply node, a second switch connected between the second operational amplifier input and the power supply node, a first capacitor connected between the first operational amplifier input and a ground node, and a second capacitor connected between the second operational amplifier input and the ground node. A second capacitor connected to the second operational amplifier input, a third switch connected between the second capacitor and the sample input, and a fourth switch connected between the second capacitor and the operational amplifier output.

Provided is a touch signal detection apparatus configured to calibrate a quantization error of a touch signal including a first digital-to-analog converter (DAC) configured to provide a first calibration voltage, a first calibration amplifier configured to amplify and output a difference between a touch signal generated by detecting touch input and the first calibration voltage using gain greater than 1, a second DAC configured to provide a second calibration voltage, a second calibration amplifier configured to sample and hold a difference between output of the first calibration amplifier and the second calibration voltage, and an analog-to-digital converter (ADC) configured to convert output of the second calibration amplifier into a digital code, wherein bit resolutions of the first DAC and the second DAC are the same.

A sample and hold circuit may comprise an operational amplifier including a first op-amp input, a second op-amp input, and an op-amp output. The sample and hold circuit may also include a first switch connected between the first op-amp input and a supply node, a second switch connected between the second op-amp input and the supply node, a first capacitor connected between the first op-amp input and a ground node, a second capacitor connected to the second op-amp input, a third switch connected between the second capacitor and a sample input, and a fourth switch connected between the second capacitor and the op-amp output.

A system and method for a post-sampling selectable gain circuit in sample and hold (S / H) analog-to-digital converters (ADCs). The method includes scaling down or scaling up a reference voltage to generate a plurality of candidate voltages associated with a plurality of measurement accuracies of a sampler circuit, each candidate voltage of the plurality of candidate voltages is respectively associated with a respective measurement accuracy of the plurality of measurement accuracies. The method includes selecting, by a processing device and based on an input voltage for the sampler circuit, a particular candidate voltage from the plurality of candidate voltages that is associated with an optimal measurement accuracy of the plurality of measurement accuracies. The method includes generating a sampler voltage associated with the optimal measurement accuracy by operating the sampler circuit based on the particular candidate voltage or an additional voltage associated with the particular candidate voltage.

The present invention inhibits interference of time-interleaved AD converters.　An AD conversion circuit (TD1) is provided with a plurality of time-interleaved AD converters (AD1 to AD4) and a plurality of sample-and-hold circuits (SH1 to SH4; SW1, SC1, GW1, . . . , SW4, SC4, and GW4) that sample and hold an analog input (AI) and a reference potential (VS) of each of the plurality of AD converters (AD1 to AD4).

The invention relates to a high-precision and low-holding-error sampling holding circuit, and belongs to the field of integrated circuits. The circuit comprises an input-stage operational amplifier, a logic voltage comparator, a logic enable control switch and an output-stage operational amplifier. The non-inverting input end of the input-stage operational amplifier receives an input signal, and the inverting input end of the input-stage operational amplifier receives a feedback signal. The two ends of the logic enabling control switch are connected with the output end of the input-stage operational amplifier and the non-inverting input end of the output-stage operational amplifier respectively. The output end of the output-stage operational amplifier is connected with the inverted input end and is connected with the inverted input end of the input-stage operational amplifier through a feedback resistor; the logic enable control switch is controlled to be turned on and turned off according to voltage signals input by the normal-phase input end and the inverted-phase input end of the logic voltage comparator; wherein the output-stage operational amplifier adopts a JFET tube as an input tube. According to the invention, the voltage drift of the sampling hold circuit during long-time working in the hold mode can be suppressed, and the hold error is reduced.

The invention relates to a positive feedback gain compensation circuit applied to a sample hold circuit, which comprises a first positive feedback compensation unit, a second positive feedback compensation unit, a first logic control unit and a first sub ADC unit, and is characterized in that the V1 end and the V2 end of the first positive feedback compensation unit are respectively connected with the positive ends of the differential input end and the differential output end of an operational amplifier; the V1 end and the V2 end of the second positive feedback compensation unit are respectively connected with the negative ends of the differential input end and the differential output end of the operational amplifier; an output signal of the first logic control unit is respectively accessed to the first positive feedback compensation unit and the second positive feedback compensation unit; and an output signal of the first sub-ADC unit is connected with an input end of the first logic control unit. According to the positive feedback gain compensation circuit applied to the sample hold circuit, the requirement for the gain of an operational amplifier in the sample hold circuit can be lowered, and meanwhile the problem that the open-loop gain of the operational amplifier introduces a nonlinear error along with the change of the output amplitude is solved.

A switched-capacitor circuit includes a sample and hold stage including an input coupled to a circuit input and including an output. The circuit includes an amplification stage including an input coupled to the output of the sample and hold stage and including an output. The circuit includes an output stage including an input coupled to the output of the amplification stage and an output coupled to the circuit output. The circuit includes a feedback stage including a first terminal coupled to the circuit output, a second terminal coupled to the input of the amplification stage and including a third terminal.

An apparatus comprises a discrete-time linear equalizer circuit. The discrete-time linear equalizer circuit comprises a sample and hold circuitry including multiple switched-capacitor circuits. The multiple switched-capacitor circuits include at least a switched-capacitor circuit of a pre-cursor tap, a switched-capacitor circuit of a cursor tap, and a switched-capacitor circuit of a post-cursor tap. A clock-driven switch circuitry is to switchably couple a capacitor of the switched-capacitor circuit of the pre-cursor tap to a signal input over a first time period, a capacitor of the switched-capacitor circuit of the cursor tap to the signal input over a second time period, and a capacitor of the switched-capacitor circuit of the post-cursor tap to the signal input over a third time period. The clock-driven switch circuitry is to switchably couple the capacitor of the switched-capacitor circuit of the cursor tap to an output, and the capacitors of the SHCs of the pre-cursor and post-cursor taps in a closed feedback loop with the capacitor of the switched-capacitor circuit of the cursor tap, over a fourth time period.

An apparatus comprises a discrete-time linear equalizer circuit. The discrete-time linear equalizer circuit includes a sample and hold circuitry including multiple switched-capacitor circuits. The multiple switched-capacitor circuits include at least a switched-capacitor circuit of a pre-cursor tap, a switched-capacitor circuit of a cursor tap, and a switched-capacitor circuit of a post-cursor tap. A clock-driven switch circuitry is to switchably couple a capacitor of the switched-capacitor circuit of the pre-cursor tap to a negative signal input over a first time period, a capacitor of the switched-capacitor circuit of the cursor tap to a positive signal input over a second time period, and a capacitor of the switched-capacitor circuit of the post-cursor tap to the negative signal input over a third time period. The clock-driven switch circuitry is to switchably couple the capacitors of the switched-capacitor circuits in parallel over a fourth time period.

The invention provides a self-adaptive analog quantity signal processing system and method. The system comprises a signal acquisition circuit, a signal sampling and holding circuit, a multi-path selection switch circuit and a multi-path signal processing circuit which are connected in sequence, the signal acquisition circuit is configured to acquire an analog quantity signal output by the analog quantity sensor; the signal sampling and holding circuit is configured to sample an analog quantity signal and hold an instantaneous level of the analog quantity signal; the multi-path selection switch circuit is configured to transmit the maintained analog quantity signal to a processing path corresponding to the multi-path signal processing circuit according to a preset frequency of the analog quantity signal; and the multi-path signal processing circuit is configured to receive the analog quantity signal, analyze and process the analog quantity signal and output a stable target analog quantity signal. According to the technical scheme, analog quantity signals can be collected, maintained and processed in a high-precision mode, stable output of the signals is achieved, the system adapts to different frequencies and application scenes, and measurement precision and reliability are improved.

The present invention relates to the field of analog-to-digital converters. Disclosed is a high-precision analog-to-digital converter apparatus for detecting gases from the thermal degradation of a cable. The apparatus comprises: an input module, which is used for receiving an external analog signal; a timing control module, which is used for providing a system clock signal to control an analog-to-digital conversion process; a comparison and conversion module, which is used for implementing a successive approximation algorithm to approximate the numerical value of an input signal by means of comparison and conversion; a sampling and holding module, which is used for sampling and holding the input signal; a reference and output module, which is used for providing a stable reference voltage, and outputting a final digital conversion result; and a register module, which is used for storing and configuring parameters of each module. The high-precision analog-to-digital converter apparatus provided in the present invention has the advantages of high precision, high efficiency, good real-time performance, high flexibility, etc., thereby effectively improving the detection precision and detection efficiency for gases from the thermal degradation of a cable.

An apparatus comprises a discrete-time linear equalizer circuit. The discrete-time linear equalizer circuit comprises a sample and hold circuitry including multiple switched-capacitor circuits. The multiple switched-capacitor circuits include at least a switched-capacitor circuit of a pre-cursor tap, a switched-capacitor circuit of a cursor tap, and a switched-capacitor circuit of a post-cursor tap. A clock-driven switch circuitry is to switchably couple a capacitor of the switched-capacitor circuit of the pre-cursor tap to a signal input over a first time period, a capacitor of the switched-capacitor circuit of the cursor tap to the signal input over a second time period, and a capacitor of the switched-capacitor circuit of the post-cursor tap to the signal input over a third time period. The clock-driven switch circuitry is to switchably couple the capacitor of the switched-capacitor circuit of the cursor tap to an output, and the capacitors of the SHCs of the pre-cursor and post-cursor taps in a closed feedback loop with the capacitor of the switched-capacitor circuit of the cursor tap, over a fourth time period.

The invention provides a boost converter and a frequency control circuit thereof, the boost converter comprises a main switch tube and a rectifier tube which are connected, the common connection end of the main switch tube and the rectifier tube is a first node, and the boost converter comprises a sampling hold circuit which samples and holds the voltage of the first node during the turn-off period of the main switch tube to obtain a first sampling signal; the integral circuit is used for integrating a second sampling signal representing the first sampling signal along with time to obtain a first integral signal during the turn-off period of the main switching tube; and the first comparator is used for comparing the first integral signal with an input sampling signal, when the first integral signal reaches the input signal, the main switch tube is controlled to be switched on, and the input sampling signal is proportional to the input voltage of the boost converter. The switching frequency of the boost converter can be controlled to be constant by controlling the turn-off time of the main switching tube.

The invention relates to a current sensing circuit. The circuit senses a first output current of the switched mode power supply. The circuit includes a sample and hold component configured to store an image of the first output current during a non-conducting phase of a high voltage switch of the switched mode power supply.

The utility model discloses a current sampling circuit and test equipment, and belongs to the technical field of battery test. The current sampling circuit comprises a voltage sampling circuit, a sampling holding circuit, an analog-to-digital conversion circuit, a processor and a comparison circuit. The voltage sampling circuit is used for collecting equalizing current of the battery pack, converting the equalizing current into sampling voltage and outputting the sampling voltage; the sampling and holding circuit is used for sampling and holding the maximum sampling voltage of the output sampling voltage; the analog-to-digital conversion circuit is used for performing analog-to-digital conversion on the maximum sampling voltage into digital sampling voltage and outputting the digital sampling voltage; the comparison circuit is used for outputting a PWM signal according to the reference voltage provided by the reference voltage end and the sampling voltage; and the processor is used for analyzing relevant parameters of the equalizing current according to the digital sampling voltage and the PWM signal, wherein the relevant parameters at least comprise a duty ratio, a period and a maximum value. The acquisition efficiency of the equalizing current data of the battery pack is effectively improved, and the acquisition error rate is reduced.

The invention discloses a self-adaptive noise reduction method and system based on kinematics information of a robot, and aims to solve the problem that the motion noise of the robot interferes with a sensor signal. Firstly, a mixed sound source of motor noise and a target sound source is collected; secondly, obtaining a linear speed and an angular speed by subscribing to a speed / dom topic in an ROS, and obtaining a non-acoustic reference signal related to the motion state of the ROS; performing weighted combination on the two speeds to form a low-frequency motion intensity reference signal in an instantaneous scalar form, and adaptively adjusting a step parameter of an LMS adaptive filter according to a change rate of the low-frequency motion intensity reference signal; and noise reduction is carried out by sampling and holding the reference signal group x (t) which is converted to be synchronous with the high-frequency audio data block as reference input. According to the method, the kinematics parameters physically decoupled from the target signal are selected as reference, the performance of the filter is dynamically optimized according to the intensity of the motion state, and efficient noise reduction of the robot under various motion working conditions is achieved.

An adaptive following capacitive sensor chip circuit, comprising: a CDAC circuit connected to an external load capacitor, a sample and hold circuit and a digital logic circuit respectively, for tracking the external load capacitor to keep consistent with the size of the external load capacitor; a RDAC circuit connected to the digital logic circuit and a comparator circuit group respectively, for generating a reference value that can be automatically adjusted to adapt to different degrees of external triggering action; an input end of the sample and hold circuit is connected between the external load capacitor and the CDAC circuit, and an output end is connected to the comparator circuit group, for controlling the acquisition of the external load capacitor size according to the signal sent by the digital logic circuit to the CDAC circuit, and outputting it to the comparator circuit group for comparison and judgment; the digital logic circuit is connected to the comparator circuit group and the sample and hold circuit, for providing the sample and hold circuit with a control timing signal, and providing the CDAC circuit and the RDAC circuit with an excitation voltage signal according to the output result of the comparator circuit group.

The embodiment of the utility model provides a signal gain circuit and electronic equipment. The signal gain circuit comprises a sampling and holding module, a first operational amplifier follower circuit, a second operational amplifier follower circuit, a subtraction operation circuit and a signal amplification module, in the first working mode of the photosensitive element, the sampling holding module obtains and stores a first sampling signal output by the photosensitive element; in the second working mode of the photosensitive element, the sampling holding module outputs the first sampling signal; the second operational amplifier follower circuit obtains a second sampling signal output by the photosensitive element; the first sampling signal and the second sampling signal are input into a subtraction operation circuit for subtraction operation; and the operation result is output to the signal amplification module to gain the signal. According to the circuit disclosed by the embodiment of the invention, the dynamic range of the effective signal in the photoelectric sensing signal is improved by eliminating the influence of the bias voltage in the photoelectric sensing signal, and the effective signal is adjusted and gained, so that the detection capability of the OES on the weak signal is improved, and the resolution of the signal can be effectively improved.