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
CN105375894AActive Publication Date: 2016-03-02中船重工安谱(湖北)仪器有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
中船重工安谱(湖北)仪器有限公司
Publication Date
2016-03-02

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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.
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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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