Sampling time error correction method for multi-channel parallel analog-digital converter (ADC) system

Abstract

The invention discloses a sampling time error correction method for a multi-channel parallel ADC system. The method comprises the steps that the output end of an analog low-pass filter and the input end of the multi-channel parallel ADC system are connected through a switching circuit, and an analog input signal x (t) enters the analog low-pass filter to obtain a narrow-band analog signal d (t), the multi-channel parallel ADC system samples the d (t) to obtain a multi-channel sampling output signal yd (n), and LMS-frequency domain self-adaption estimation is performed on the yd (n) to obtain a sampling time error omega (n); sending the analog input signal x (t) into the multi-channel parallel ADC system through the switching circuit, performing sampling to obtain a sampling output signal y (n) which is processed by a digital differential analyzer and then subjected to a first multiplying unit with omega (n) to obtain a system error signal c (n), and y (n) and c (n) are subjected to a subtractor to obtain the corrected output signal yc (n). According to the method, the problems of aliasing and the difficulty in achieving of high-rate hardware circuits are solved on the basis of error correction.

Description

technical field [0001] The invention relates to the field of high-speed and high-precision analog-to-digital conversion, in particular to a sampling time error correction method for a multi-channel parallel ADC system. Background technique [0002] Analog-to-digital converter (ADC), as the interface between analog technology and digital technology, is widely used in modern electronic systems. With the development of digital signal processing technology, digital circuits have higher and higher requirements on the sampling rate of analog-to-digital converters. The most important performance parameters of an ADC are conversion accuracy and conversion speed. Limited by the current level of ADC chip development, it is difficult for a single ADC to have high speed and high precision at the same time. The speed and precision of ADC are mutually restricted. With the increase of ADC conversion speed, its precision tends to decline. The constraint between the two has become the main...

AI Technical Summary

Problems solved by technology

However, this cannot avoid the problem of aliasing, which greatly limits the bandwidth of the input signal and the scope of application

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