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A Microcurrent Detection Circuit

A detection circuit and micro-current technology, which is applied in the direction of measuring current/voltage, measuring devices, and measuring electrical variables, etc., can solve the problems that the bandwidth is not wide enough, and the micro-current detection circuit cannot achieve high gain and high bandwidth at the same time, so as to increase the circuit The effect of driving ability

Inactive Publication Date: 2019-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] What the present invention aims to solve is the limitation that the above-mentioned existing micro-current detection circuit cannot achieve high gain and high bandwidth at the same time, especially the problem that the bandwidth is not wide enough when the parasitic capacitance of the photoelectric tube is large.

Method used

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  • A Microcurrent Detection Circuit
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Embodiment Construction

[0010] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0011] For transimpedance amplifiers, such as figure 2 As shown, considering that the output signal is always above the static operating point,

[0012] In order to increase the output signal swing, the quiescent operating point is set as low as possible. In order to increase the matching of the circuit, the inside of the transimpedance amplifier is composed of three common-source common-drain cascades with identical parameters, and the feedback makes the static points of the three common-source common-drain remain the same, that is, the drain, gate, source of M1 The electrode voltage is equal to the drain, gate and source voltages of M3 and M5 respectively, and the leakage current of M1, M3 and M5 is the same; the drain, gate and source voltages of M2 are respectively equal to the drain and gate voltages of M4 and M6 The pole and source voltages are equal,...

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Abstract

The invention belongs to the technical field of electronic circuits and relates to a microcurrent detection circuit. The broadband micro-current detection circuit of the present invention is divided into front and back two stages, and the front stage is a transimpedance amplifier with low input impedance, which realizes the main transimpedance gain of the circuit under a sufficiently wide bandwidth; the latter stage is a voltage gain stage, which provides a certain gain and increase circuit drive capability. The present invention can realize the bandwidth of more than tens of megahertz and more than 10 6 magnitude of transimpedance gain.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to a microcurrent detection circuit. Background technique [0002] In a high-speed optoelectronic integrated circuit (OEIC), a photodiode receives a light signal to generate a weak current signal, and a transimpedance amplifier converts the current signal into a voltage signal. The pre-stage micro-current detection circuit has a crucial impact on the speed and noise performance of the entire system. Its core is to convert the weak current generated by the photodiode into a voltage signal through a transimpedance amplifier. Since the current generated by the photocell is relatively small, the pre-stage current detection circuit is required to have sufficient gain; and the parasitic capacitance of the photocell is large, and in high-speed applications, the circuit is required to have sufficient bandwidth, so the current detection circuit needs to be in a higher frequency ban...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 周泽坤龚宏国刘程嗣石跃王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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