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Weak signal acquisition and processing circuit

A technology for collecting and processing weak signals, applied in the measurement of electrical variables, current/voltage, measurement devices, etc. Convenient and improve the effect of precise positioning

Inactive Publication Date: 2012-01-18
SUZHOU INST OF BIOMEDICAL ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively high interference in the power supply, that is, the 50Hz power supply interference, this greatly affects the recognizability of the signal and the accuracy of the instrument
In addition, in some optical instruments, the signal to be processed is often not in a specific area, that is, distributed in multiple measurement ranges. In the previous processing circuit, there was only a specific feedback resistor, which limited The measuring range of the instrument

Method used

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  • Weak signal acquisition and processing circuit

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Embodiment Construction

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0020] see figure 1 As shown, this embodiment includes a weak signal acquisition circuit 1, a pre-low-pass filter circuit 2, a 50HZ band-stop filter circuit 3 and a post-amplification circuit 4; the specific connection method is a weak signal acquisition circuit 1, a pre-low-pass filter circuit 2, 50Hz band-stop filter circuit 3, and post-amplification circuit 4 are connected in sequence.

[0021] see figure 2 As shown, the weak signal acquisition circuit 1 is composed of first and second resistors R1 and R2, first and second capacitors C1 and C2, and a precision operational amplifier U1. The first resistor R1 and the first capacitor C1 are connected in parallel to the non-inverting input terminal of the precision operational amplifier U1 to match the feedback resistor and capacitor. After the second resistor R2 and the second ca...

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Abstract

The invention discloses a weak signal acquisition and processing circuit, which comprises an acquisition circuit, a front low-pass filter circuit, a 50-Hz interference signal filter circuit and a rear amplifying circuit which are connected in sequence. A weak current signal is converted into a corresponding voltage signal by using a high-precision operational amplifier, so that the weak signal can be effectively amplified, and error in acquisition is reduced. By connecting the low-pass filter with the 50-Hz interference signal filter circuit in series, power noise and signal noise produced by the acquisition circuit can be greatly reduced, and the accuracy for measurement is improved. In addition, the rear amplifying circuit provides amplifying channels for a plurality of feedback resistors, which can amplify for different multiples aiming at different levels of signals, so that the processed signal can be guaranteed within a measuring range of a singlechip.

Description

[0001] technical field [0002] The invention belongs to the field of signal acquisition, and in particular relates to a weak signal acquisition and processing circuit. [0003] Background technique [0004] At present, in the research and development of optical instruments, signal acquisition and processing is an important factor affecting the sensitivity and accuracy of the instrument. In optical instruments, it is necessary to convert optical signals into electrical signals for acquisition and processing, and these electrical signals converted from optical signals are relatively weak, so the signal acquisition circuit is required to have high sensitivity. Because there is relatively high interference in the power supply, that is, 50Hz power supply interference, this greatly affects the recognizability of the signal and the accuracy of the instrument. In addition, in some optical instruments, the signal to be processed is often not in a specific area, that is, distribute...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 钱庆
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH
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