Pipeline successive approximation analog-to-digital converter background gain calibration circuit and method

Abstract

The present invention provides a pipelined successive approximation analog-to-digital converter background gain calibration circuit and method. By superimposing different pseudo-random sequences in the input signal, analog-to-digital conversion and correlation operations are performed on the input signals superimposed with different pseudo-random sequences. and accumulative averaging and other post-processing operations to obtain the final gain error coefficient; compared with the existing pipeline-type successive approximation analog-to-digital converter background gain calibration technology, it can avoid gain calibration due to the use of long-period pseudo-random sequences , which leads to problems such as increased power consumption and longer conversion time during circuit implementation, and can effectively improve the efficiency of gain error calibration in pipelined successive approximation analog-to-digital converters, with high efficiency, low power consumption, and circuit area savings. .

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and relates to a backstage gain calibration circuit and method of a pipeline successive approximation analog-to-digital converter. Background technique [0002] The pipelined successive approximation analog-to-digital converter fully combines the low power consumption and clear logic characteristics of the successive approximation analog-to-digital converter, and the pipelined analog-to-digital converter works in a pipelined form and has the advantage of speed, so it has low power consumption. The advantages of high power consumption and high speed have become a research hotspot in the field of analog-to-digital converters. However, since the pipelined analog-to-digital converter has a gain stage between stages to amplify the residual signal, in a high-speed analog-to-digital converter, the gain stage is generally composed of an open-loop amplifier, and the open-loop amplifier, althou...

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Problems solved by technology

[0005] In view of the above-mentioned shortcoming of the prior art, the purpose of the present invention is to provide a pipelined successive approximation analog-to-digital converter background gain calibration circuit and method, for solving the existing pipelined successive approximation analog-to-digital converter background gain calibration In the method, when the method of superimposing the pseudo-random sequence signal in the input signal is used to deal with the gain error problem of the pipelined successive approximation analog-to-digital converter, if the short-period pseudo-random sequence signal is superimposed, the calibration accuracy of the gain error will decrease.

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