6 results about "Charge sensitive amplifier" patented technology

This invention discloses an ASIC chip with an energy response self-calibration module, comprising a multi-pixel channel array containing N independent pixel channels. Each pixel channel includes a charge-sensitive amplifier module, a shaping circuit, a pulse energy discrimination module, and a counting module. The pulse energy discrimination module has a built-in comparator. The chip also includes an energy response self-calibration module, comprising a test pulse generator, a reference voltage control submodule, and a calibration logic control submodule. By controlling the pulse height and the magnitude of the reference voltage Vref, the S-curves of each pixel channel corresponding to different test pulse heights are obtained. Based on a preset calibration algorithm, the polynomial coefficients of the reference voltage and the calibrated DAC value for each pixel channel are calculated and stored. This invention enables consistent energy response across all pixel channels of the ASIC, and allows the calibration coefficients to be read after self-calibration to determine the differences between the ASIC channels.

A circuit for an X-ray-induced voltage pulse amplitude estimation inside a pixel readout channel, in a hybrid pixel array detector, an input of the circuit is connected to a pixel electrode, is provided. The circuit including a charge-sensitive amplifier (CSA) block configured to amplify a current pulse carried to its input from the pixel electrode and to convert it to a voltage pulse; an analog to digital converter (ADC) block connected to an output of the CSA block and configured to operate at a first clock frequency, and to sample an input voltage signal and output a result of the sampling as a codeword, wherein an artificial neural network (ANN) block is configured to operate at a second clock frequency, and to perform operations related to the neural network and estimate an amplitude of the voltage pulse, the ANN block in communication with the ADC block.

The application discloses a three-electrode perovskite X-ray detector and a preparation method thereof, and belongs to the technical field of perovskite X-ray detectors. The method comprises the following steps: providing a substrate; preparing a gate electrode on the substrate, wherein the gate electrode comprises a surface gate, a mesh gate and a two-dimensional gate; preparing a gate dielectric on the gate electrode, wherein the gate dielectric comprises polyimide; preparing a perovskite absorption layer on the gate dielectric, wherein the perovskite absorption layer is a thin film or a thin film; preparing a self-assembled layer on the perovskite absorption layer, wherein the self-assembled layer comprises an alkyl mercaptan, a halide salt, an organic ammonium salt and NiOx; preparing a bottom electrode on the left side of the self-assembled layer; and preparing a collecting electrode on the right side of the self-assembled layer. The method introduces a gate electrode and a gate dielectric on the basis of a traditional double electrode, realizes an integrated unit of absorption-electric field regulation-signal reading, thereby obtains built-in gain and noise suppression of the device, and completes signal reading in cooperation with a near-end transimpedance or charge-sensitive amplifier.

A charge filter instrument includes a field-free drift region, a plurality of charge detection cylinders in the drift region through which ions drifting axially therethrough pass, a plurality of charge sensitive amplifiers each coupled to at least one of the charge detection cylinders and configured to produce a charge detection signal corresponding to a charge of one or multiple ions simultaneously passing therethrough, a charge deflector or charge steering device coupled to the outlet end of the drift region, means for determining charge magnitudes or charge states of each of the ions drifting axially through the drift region based on the charge detection signals, and means for controlling the charge deflector or the charge steering device to pass through at least one outlet thereof only ions having a determined charge magnitude or charge state equal to, or within a specified range of, a specified charge magnitude or charge state.

The invention provides a positive and negative charge detection circuit of a pulse ionization chamber, which comprises a current-voltage conversion circuit, a voltage follower, a charge sensitive amplifier, an in-phase / anti-phase proportional amplification circuit, a charge identification circuit and a polarity matching circuit, the current-voltage conversion circuit is used for converting charges or current signals generated by the pulse ionization chamber into voltage signals; the voltage follower provides high input impedance, the charge sensitive amplifier amplifies signals, the in-phase / anti-phase proportional amplification circuit further amplifies the signals and outputs signals with the same amplitude and the phase difference of 180 degrees, and the charge identification circuit detects the positive and negative of a high-voltage electrode and outputs low-level or high-level signals. The polarity matching circuit controls the output of input signals through low-level or high-level signals of the charge identification circuit, and the output signals are positive signals. Positive and negative charges of the circuit can be detected, and polarity conversion of output signals can be automatically carried out according to high voltage types.

The invention provides a high-temperature-resistant low-noise front-end reading system and method of a perovskite radiation detector, and the system comprises the perovskite radiation detector which is used for converting incident gamma rays or X rays into charge signals; the charge sensitive amplifier is used for converting the charge signal into a step voltage signal proportional to the charge signal, and a resistor and a capacitor are arranged in a feedback path; the shaping and amplifying module is used for shaping the step voltage signal into a Gaussian or quasi-trapezoidal pulse signal; the digital acquisition and control module is used for carrying out real-time sampling, digital filtering and energy spectrum extraction on the Gaussian or quasi-trapezoidal pulse signal and simultaneously realizing self-calibration control on bias voltage, working temperature and noise state; and the high-temperature-resistant low-noise power supply module is used for providing low-drift bias voltage for the charge sensitive amplifier, the shaping amplification module and the perovskite radiation detector. According to the invention, high-fidelity reading of weak radiation signals under the conditions of high temperature, strong vibration and limited space can be realized.