Method for improving output precision of assembly line analog-digital converter and analog-digital converter

Abstract

The invention provides a method for improving output precision of an assembly analog-digital converter and the assembly line analog-digital converter. The assembly analog-digital converter comprises multiple serially connected polar circuits, a residual error amplifying circuit and a sub analog-digital converter are arranged at each polar circuit; the method comprises the following steps: S1, adding a calibration module in a first stage polar circuit, wherein the calibration module comprises a switch capacitor array, and the switch capacitor array comprises at least one jittering capacitor; S2, measuring and storing each sampling capacitor in the residual error amplifying capacitor and an initial weight value of each jittering capacitor when the input signal of the polar circuit is zero; and S3, calibrating a digital signal output by the polar circuit by using the initial weight value of each sampling capacitor, and finishing the jittering-elimination processing at a digital domain byusing the initial weight value of each jittering capacitor so as to finish the foreground calibration process.

Description

technical field [0001] The invention relates to the technical field of analog-to-digital conversion, in particular to a method for improving the output precision of a pipelined analog-to-digital converter and an analog-to-digital converter. Background technique [0002] This section is intended to provide a background or context to a detailed description of the invention that is recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Due to its high-speed and high-precision characteristics, pipeline analog-to-digital converters are widely used in communications, radar, medical, instrumentation, automotive electronics and other fields. With the continuous development of electronic technology, higher requirements are placed on the speed, accuracy and power consumption of analog-to-digital converters. [0004] For switched capacitor analog-to-digital converters, it is becoming more and more important to achieve wi...

AI Technical Summary

Problems solved by technology

[0004] For switched capacitor analog-to-digital converters, it is becoming more and more important to achieve wide bandwidth and low power consumption, so it is necessary to reduce the size of the sampling capacitor as much as possible, but the reduction of the capacitor will inevitably increase the mismatch error; at the same time, advanced technology Factors such as the lower intrinsic gain of the lower MOS tube and the gradual decrease of the power supply voltage affect the design of high-gain operational amplifiers, resulting in finite gain errors

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