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Weak current amplifier circuit and sensor system

A weak current, amplifying circuit technology, applied in amplifiers with multiple amplifying components, improving amplifiers to reduce temperature/power supply voltage changes, etc., can solve the problems of large differences in output effects and large differences in input impedance, and It is convenient for personalized design, good common mode rejection ability, and the effect of improving the amplitude ratio

Active Publication Date: 2022-03-29
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The input impedance of these back-end devices is very different. If the output signal is not specially processed, the output effect will be very different in these different applications.

Method used

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  • Weak current amplifier circuit and sensor system
  • Weak current amplifier circuit and sensor system
  • Weak current amplifier circuit and sensor system

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Embodiment Construction

[0035] Embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0036] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be used for fixation as well as for coupling or communication.

[0037] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in ...

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Abstract

A weak current amplifying circuit and a sensor system, the weak current amplifying circuit has a cross-set two-stage amplification and two-stage filtering structure, including a connected charge amplifier, a first-stage filter, a second-stage amplifier and a band-stop filter , the charge amplifier converts the weak current into an amplified voltage output, the first-stage filter performs at least one of low-pass, band-pass, and high-pass filtering on the output voltage of the charge amplifier, and the second-stage amplifier performs the second-stage amplification process , the second-stage amplifier has a two-stage differential amplifier circuit, in which the front stage amplifies the differential-mode input signal through the in-phase differential input method, and follows the common-mode input signal to improve the difference between the differential-mode signal and the common-mode signal sent to the subsequent stage. The amplitude ratio of the signal, the band-stop filter is used to filter out 50Hz power frequency noise interference. The weak current amplifying circuit overcomes the problems of previous amplifying circuits such as strong noise, power frequency interference, impedance mismatch at the output end, and output saturation of the op amp.

Description

technical field [0001] The invention relates to a weak current amplifying circuit and a sensor system with the weak current amplifying circuit. Background technique [0002] In practical applications, it is often faced with the precise measurement of weak signals such as micro-light intensity, micro-magnetic field, micro-displacement, micro-pressure, and micro-temperature difference. Sensing of these physical quantities to be measured is often achieved using photoelectric sensors, magnetometers, displacement sensors, piezoelectric sensors, and pyroelectric sensors. Since the signal to be measured is very weak, the output current directly obtained by the sensor is often only in the order of pA to nA. Such a weak current signal is very difficult to process, and it is easily overwhelmed by noise during line transmission, and often requires further amplification and filtering before it can be displayed on the meter head of the instrument. Therefore, the amplification of pA-nA ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/42H03F1/30
CPCH03F3/42H03F1/30
Inventor 董瑛韩留洋王晓浩
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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