An Integrator Circuit Applied to Ultraviolet Focal Plane Detector

Abstract

The invention discloses an integrating circuit applied to an ultraviolet focal plane detector. The integrating circuit converts the photocurrent signal of the ultraviolet focal plane detector into a voltage signal by performing linear integral amplification on an integrating capacitor through an integrating amplifier, and passes the low The leakage current structure reduces the influence of the leakage current and reduces the initial voltage of the integral output; the integration circuit of the present invention adds a low leakage current structure to the traditional structure to obtain an integral voltage with higher linearity and a larger output range, which is a good source for subsequent sampling. The circuit provides an integrated voltage with higher linearity and increases the output voltage range.

Description

technical field [0001] The invention relates to the technical field of data processing of ultraviolet focal plane detectors, in particular to an integrating circuit applied to ultraviolet focal plane detectors. Background technique [0002] The readout circuit of the UV focal plane detector mainly includes an integrating circuit and a sampling circuit. The function of the integrating circuit is to integrate and amplify the photocurrent signal of the ultraviolet focal plane detector, convert it into a voltage signal, and then sample it and output it by the sampling circuit. Since the reset switch tube of the integrating circuit is not an ideal switch tube, when the circuit is in the integrating state, the reset circuit still draws current, and this part of the current is called leakage current. Excessive leakage current will seriously affect the integration result of the integrating circuit, which is usually undesirable. In order to solve the problem of leakage current, the...

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Problems solved by technology

Excessive leakage current will seriously affect the integration result of the integrating circuit, which is usually undesirable

In order to solve the problem of leakage current, the current solutions all use transmission gates as switching tubes, with the purpose of using complementary switches to reduce charge injection. However, through simulation, it is found that although the above methods can reduce the impact of leakage current, they are not effective for UV focus. As far as the photocurrent of the planar detector is concerned, it is not enough, even if the leakage current is reduced, it will still have a great impact on the integration result, and in order to save area and power consumption, the integral op amp structure in the pixel unit often chooses a one-stage Op amp, the shortcoming of this op amp structure is that the output voltage range is narrow

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