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High-gain low-noise weak pulse current signal amplification circuit

A technology of signal amplification circuit and pulse current, which is applied in the direction of DC-coupled DC amplifiers, amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve the problems of gain, noise and bandwidth constraints, and achieve good stability and noise Low, compact effect

Active Publication Date: 2016-03-02
中船重工安谱(湖北)仪器有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] In view of this, the present invention provides a high-gain and low-noise weak pulse current signal amplifying circuit, which can better solve the problem of mutual restriction of gain, noise and bandwidth in weak current signal amplification

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Embodiment Construction

[0027] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0028] A high-gain and low-noise weak pulse current signal amplifying circuit includes a capacitance conversion module, a feedback compensation module, a zero point compensation module, and a two-order low-pass filter module. The input terminal of the capacitance conversion module is connected to the device to be detected, the output terminal is connected to the input terminal of the feedback compensation module, and also connected to the input terminal of the zero point compensation module; the output of the feedback compensation module is connected to the input terminal of the capacitance conversion module to form a feedback structure ; The output of the zero point compensation module is connected to the input end of the second-order low-pass filter module; the output of the second-order low-pass filter module is a conditioned signal. The capacitance con...

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Abstract

The invention discloses a high-gain low-noise weak pulse current signal amplification circuit. An input end of a capacitance conversion module is connected with a to-be-detected device, and an output end is connected with the input end of a feedback compensation module and simultaneously is also connected with an input end of a zero compensation module; the output of the feedback compensation module is connected with an input end of the capacitance conversion module to form a feedback structure, and the feedback compensation module utilizes a special circuit structure, so that a signal, the frequency of which is lower than a specific frequency f, of feedback signals is amplified by a plurality of times, and a signal, the frequency of which is higher than the specific frequency f, is strongly attenuated so as to compensate a DC component of the input part of the capacitance conversion module and prevent the output of the capacitance conversion module from saturating without affecting a signal, the frequency of which is high than the f, of the input; furthermore, the output of the zero compensation module is connected with the input end of a two-stage low-pass filtering module, and the zero compensation module is used for increasing the bandwidth of a whole circuit.

Description

technical field [0001] The invention relates to the field of weak current signal detection, in particular to a high-gain and low-noise weak pulse current signal amplifying circuit, which can be applied to weak current signal amplification occasions such as electrochemistry, photoelectric detection, ion mobility spectroscopy, and scanning tunneling electron microscope. Background technique [0002] Weak current signals refer to current signals at nanoampere (nA), picoampere (pA) and femtoampere (fA) levels, which are widely used in electrochemical voltammetry analysis, photoelectric detection, electrostatic detection, ultra-high resistance detection, mass spectrometry, Material composition analysis and other occasions. In the above occasions, how to measure the weak current signal is an important issue in the whole detection process. Generally speaking, the smaller the weak current signal, the higher the gain of the pre-amplification circuit that needs to be designed; howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/26H03F1/42H03G3/20
CPCH03F1/26H03F1/42H03F3/45475H03F3/45928H03F2200/36H03F2200/372H03F2203/45014H03G3/301
Inventor 兰江李明勇尤兴志蔡庸军黄启勇
Owner 中船重工安谱(湖北)仪器有限公司
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