Integrator circuit for increasing reset speed

Abstract

One embodiment of the invention discloses an integrator circuit for increasing reset speed, and the circuit comprises an amplifier which comprises a reverse input end, a positive input end, an output end and a reset end; an integrating capacitor array; a first switch; and a second switch; the first end of the integrating capacitor array, the first end of the first switch and the second end of the second switch are connected with a reverse input end; the second end of the integrating capacitor array and the second end of the first switch are connected with the output end; the first end of the second switch receives a current input signal; the positive input end receives a reference voltage; in the coarse reset stage, the first switch receives an effective first reset signal, and the reset end receives an effective second reset signal, so that a voltage output signal output by the output end is close to a reference voltage; in the fine reset stage, the first switch continues to receive the effective first reset signal, and the reset end does not receive the effective second reset signal any more, so that the voltage output signal output by the output end is closer to the reference voltage than in the coarse reset stage.

Description

technical field [0001] The invention relates to the technical field of signal conversion, in particular to an integrator circuit for improving reset speed. Background technique [0002] The current-voltage integrator is mainly used in the field of X-ray detectors, and its main function is to convert the current signal output by the sensor into a voltage signal. Since the converted current may be very low, the integrator needs to have extremely low noise. Designers often reduce the bandwidth of the integrator by increasing the Miller compensation capacitance of the amplifier in the integrator to reduce the noise of the integrator. But as the bandwidth of the integrator decreases, the time it needs to reset during the reset phase will be longer. [0003] The reset speed of the traditional integrator mainly depends on the bandwidth of the integrator. The larger the bandwidth of the integrator, the faster the reset speed, but the greater the noise generated by the integrator du...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an integrator circuit that improves the reset speed, by increasing the reset terminal of the amplifier and the reset signal connected to the reset terminal and the structure of the amplifier circuit to reduce the reset time and solve the problem of long reset time of the traditional integrator

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