A processing method of ad sampling signal and ad sampling signal device

Abstract

The invention discloses an AD sampling signal processing method and an AD sampling signal device, and the method comprises the following steps: (1), setting the triggering frequency F for triggering an AD conversion module as F=f*(N+2), wherein f is a needed signal sampling frequency, and N is a magnification factor needed by the AD conversion module; (2), enabling the AD conversion module to collect an AD reference value and a to-be-collected AD input signal value, wherein the AD reference value and the to-be-collected AD input signal value are filtered for multiple times; (3), carrying the deviation correction of the AD input signal value after multiple filtering according to the AD reference value after multiple filtering, and outputting an AD sampling value. The device comprises the AD conversion module, a triggering source and a timer, and can eliminate the offset of AD sampling, and improve the accuracy. Through the processing of an AD sampling process, the method improves the AD sampling resolution. The method eliminates signal aliasing and reduces the signal jitter impact through a multiple filtering algorithm.

Description

technical field [0001] The application relates to a processing method of AD sampling signals and an AD sampling signal device, which can improve AD sampling accuracy, eliminate signal aliasing problems and reduce the influence of signal jitter through process algorithm processing. Background technique [0002] The current mainstream microcontrollers (MCU, DSP, etc.) on the market all integrate 10-bit or 12-bit AD conversion modules. Solve the signal aliasing problem and the signal jitter problem in the AD conversion process. [0003] The usual ways to improve AD sampling resolution are: 1. Using external high-resolution (16-bit, or higher conversion digits), while the resolution is greatly improved, the conversion rate is reduced and the cost is greatly increased; 2. 1. Using a microcontroller with a built-in high-resolution AD conversion module increases the cost, not only reduces the conversion rate, but also occupies one more AD input channel due to the use of differenti...

AI Technical Summary

Problems solved by technology

But this will increase the hardware cost, and the anti-aliasing filter set point of the hardware circuit is fixed and not adjustable, which is inflexible

[0005] The jitter of the signal is mainly introduced by random noise, which is generated during the AD quantization process, and it is difficult to completely eliminate it.

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