Digital Background Calibration Method for High Speed ​​Analog-to-Digital Converter

Abstract

The invention provides a digital background calibration method of a high-speed analog-to-digital converter, comprising: a synchronization circuit synchronizing the original digital conversion signal output by the high-speed analog-to-digital converter with the reference digital conversion signal output by the delta-sigma analog-to-digital converter Matching; the backward-type all-pole lattice adaptive filter adopts the variable step size least mean square gradient search algorithm to convert the original digital conversion signal output by the high-speed analog-to-digital converter after synchronous matching and the reference Δ-Σ type analog-to-digital conversion The error iteration is performed on the reference digital conversion signal output by the device to obtain a coefficient matrix with optimal weight; the backward all-pole lattice adaptive filter convolves the original digital conversion signal with the coefficient matrix to obtain a calibrated digital signal encoding. The invention retains the conversion speed of the high-speed analog-to-digital converter, realizes high-speed analog-to-digital signal conversion, and simultaneously reduces the use range and complexity of high-performance and high-power consumption analog circuits.

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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