Digital background calibration method for high-speed analog-digital converter

Abstract

The invention provides a digital background calibration method for a high-speed analog-digital converter. The method comprises the following steps that a synchronous circuit is used for synchronously matching original digital conversion signals output by the high-speed analog-digital converter with reference digital conversion signals output by a delta-sigma type analog-digital converter; by the adoption of the variable step size least mean square gradient search algorithm, a backward type all-pole lattice self-adapting filter is used for conducting error iteration on the synchronously-matched original digital conversion signals output by the high-speed analog-digital converter and the synchronously-matched reference digital conversion signals output by the reference delta-sigma type analog-digital converter, so that a coefficient matrix with the optimal weight is obtained; the backward type all-pole lattice self-adapting filter is used for conducting convolution on the original digital conversion signals and the coefficient matrix, so that calibrated digital signal codes are obtained. The conversion speed of the high-speed analog-digital converter is reserved, high-speed analog-digital signal conversion is achieved, and meanwhile the use range and complexity of a high-performance and high-power-consumption analog circuit are reduced.

Description

technical field [0001] The invention relates to the technical field of analog-to-digital conversion, in particular to a digital background calibration method of a high-speed analog-to-digital converter. Background technique [0002] High-performance analog-to-digital converters are widely used in various biomedical electronics and smart mobile electronic devices. The performance of traditional analog-to-digital converters is limited by the analog circuitry itself. Usually high-precision circuits require large-gain amplifiers and large sampling load capacitors, but high-speed circuits require large-bandwidth amplifiers and small load capacitors, and low-power circuits require small capacitors and low-bandwidth amplifiers. In amplifier design performance, high gain and high bandwidth are contradictory quantities, and they need to be compromised with each other, or both need to be realized at the cost of large power consumption. Moreover, the analog signal itself has weak ant...

AI Technical Summary

Problems solved by technology

[0007] In addition, the influence of the amplifier transfer curve leads to various linear and nonlinear errors in the transfer curve;

[0008] The accumulation of noise voltage at the pipeline stage directly limits the effective accuracy of the quantifiable signal

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