Successive approximation type ADC and asynchronous logic control circuit thereof

Abstract

The invention provides a successive approximation type ADC and an asynchronous logic control circuit thereof, and the circuit comprises n stages of capacitor voltage tracking modules, wherein each stage of capacitor voltage tracking module tracks the voltage establishment of each weight bit capacitor in the successive approximation type ADC, and generates a corresponding control signal and a pulse signal after the establishment is completed, capacitor voltage tracking modules are connected in sequence, the higher the weight bit of the capacitor is, the higher the level of the capacitor voltage tracking module corresponding to the capacitor is, and the rear-stage capacitor voltage tracking module receives a control signal output by the front-stage capacitor voltage tracking module and starts to work after the front-stage capacitor voltage tracking module completes voltage establishment; and a logic module connected to the output end of each stage of capacitor voltage tracking module, and triggers a logic control clock based on the pulse signal output by any stage of capacitor voltage tracking module. According to the method, establishment of different weight bits of the DAC can be simulated, so that a proper control clock is accurately generated, and the effects of saving time and improving the conversion speed of the ADC are achieved.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a successive approximation ADC and its asynchronous logic control circuit. Background technique [0002] An analog-to-digital data converter (ADC) is an essential electronic component for converting natural analog signals to computer digital signals. High-speed and high-precision ADCs have always been one of the most important trends in the development of ADCs. Whether it is academic or industrial applications, people are unanimously committed to how to improve the accuracy and how to break through the speed limit. [0003] The conversion cycle of the ADC can be divided into two stages according to the chronological order of the actual work. The first stage is sampling, which accurately samples the analog signal to be converted to the capacitor and holds it; the second stage is conversion, which is to convert the first The analog signal obtained by the stage sampling is ...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a successive approximation ADC and its asynchronous logic control circuit, which is used to solve the problem of long conversion time in the prior art

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