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Integral circuit applied to ultraviolet focal plane detector

A technology of integrating circuits and detectors, applied in logic circuit interface devices, logic circuit connection/interface layout, instruments, etc., can solve the problems of leakage current affecting the integration results of the integration circuit, narrow output voltage range, and influence on the integration results, etc., to achieve Reduced leakage current, increased output voltage range, and high linearity

Active Publication Date: 2019-07-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Integral circuit applied to ultraviolet focal plane detector
  • Integral circuit applied to ultraviolet focal plane detector
  • Integral circuit applied to ultraviolet focal plane detector

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The traditional integrating circuit applied to the ultraviolet focal plane detector includes an operational amplifier, an integrating capacitor C FB and reset transmission gate T2, as figure 1 As shown; the working principle of the traditional integrating circuit is: in the process of integrating, reset the transmission gate T 2 disconnected, the UV focal plane detector photocurrent passes through the integrating capacitor C FB Carry out integral amplification and convert it into a voltage signal; in the reset process, reset the transmission gate T 2 conduction, the integrating capacitor C FB Do a reset. In the integration process of the traditional integration circuit, the integration capacitor performs integration and amplification of the photocurrent signal, and the reset circuit stops working. However, because the reset switch is not an ideal switch, even if the switch is turned off, there will still be current flowing through it. This part of the current Theref...

Embodiment 2

[0025] Based on Embodiment 1, in this implementation, the bulk terminal voltage of the transistor M1 and the transistor M2 is V ref ; The source voltage of the transistor M1 is V ref , the gate is connected to the reverse control signal RESB, and the drain is connected to the transmission gate T1; the source and drain of the transistor M2 are both connected to the transmission gate T1, and the gate is connected to the reverse control signal RESB; the transmission gate T1 The gate of one transistor is connected to the control signal RES, the gate of the other transistor is connected to the reverse control signal RESB, and the transistor body terminals in the transmission gate T1 are connected to their respective source terminals, such as figure 2 shown.

[0026] During the integration process, the integral capacitor performs integral amplification on the photocurrent signal, and the reset circuit stops working. However, since the reset switch tube is not an ideal switch tube,...

Embodiment 3

[0028] Based on the above-mentioned embodiment 2, such as figure 2 As shown, the integration circuit of this embodiment also includes a reset transmission gate T2, and the reset circuit is formed by the reset transmission gate T2 and a low leakage current structure, such as figure 2 shown. The reset transmission gate T2 is connected between the output terminal of the operational amplifier and the drain of the transistor M1; and the body terminal of one of the transistors in the reset transmission gate T2 is connected to the voltage vdd, and the gate is connected to the reverse control The signal RESB, the body terminal of another transistor is connected to gnd, and the gate is connected to the control signal RES. Such as figure 2 As shown, the shown reset transmission gate T2 is composed of a PMOS transistor and an NMOS transistor, and the body terminal of the PMOS transistor is connected to the power supply vdd, and its gate is connected to the reverse control signal RES...

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Abstract

The invention discloses an integral circuit applied to an ultraviolet focal plane detector. The integral circuit carries out linear integral amplification on a photocurrent signal of the ultraviolet focal plane detector through an integral amplifier on an integral capacitor to convert the photocurrent signal into a voltage signal. The influence of leakage current is reduced through a low leakage current structure. The initial voltage of integral output is reduced. According to the integral circuit provided by the invention, the low leakage current structure is added to a conventional structureto acquire integral voltage with higher linearity and larger output range; integral voltage with higher linearity is provided for a subsequent sampling circuit; and the output voltage range is increased.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/02H03K19/003H03K19/0175
CPCG01J5/02H03K19/00346H03K19/00369H03K19/017509
Inventor 吕坚张曦冉祝威李小飞阙隆成
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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