Method for eliminating direct-current offset voltage of low-speed signal measurement link

Abstract

The invention discloses a method for eliminating direct-current offset voltage of a low-speed signal measurement link, which relates to the technical field of signal measurement and comprises the following steps of: controlling an analog signal change-over switch to respectively input two signals into a non-inverting input end and an inverting input end of a programmable gain amplifier; signals pass through the programmable gain amplifier and the analog signal buffer, then are subjected to analog-to-digital conversion through the analog-to-digital converter and then are output to the result calculation circuit, and meanwhile the analog signal change-over switch is controlled to switch the two signals. And after passing through the programmable gain amplifier, the analog signal buffer and the analog-to-digital converter again, the result calculation circuit subtracts the two output results and then divides the result by 2, and a quantization result for eliminating the direct-current offset voltage is output. Under the condition that the circuit scale and the power consumption are not increased, the analog-to-digital converter is adopted to switch and quantize the signal for multiple times, and the direct-current offset voltage is eliminated through digital operation, so that high integration of a chip is facilitated.

Description

technical field [0001] The invention relates to the technical field of signal measurement, in particular to a method for eliminating DC offset voltage in a low-speed signal measurement link. Background technique [0002] With the rapid development of the Internet of Things, the connection between devices and sensors and the Internet has put forward higher requirements for chip performance, requiring the chip to process voltage, current and other signals generated by some sensors more accurately and quickly. It also includes temperature information, humidity information, and ambient brightness information. In these processing circuits, it is usually necessary to amplify the signal so that the signal can be quantized and identified by subsequent analog-to-digital converters. When using an amplifier, due to the current chip manufacturing process, there is a certain difference in MOS tubes with the same internal size, resulting in a phenomenon of DC offset voltage, which affect...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for eliminating DC offset voltage in the low-speed signal measurement link, which is used to solve the existing problems in the method of eliminating DC offset voltage in the prior art, which are not conducive to chip miniaturization, high integration, and newly introduced The clock frequency increases the power consumption of the circuit and brings about the problem of crosstalk

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