Disorder bit compensation circuit for gradual approaching A/D converter

Abstract

The offset compensation circuit for successive approximation analog-to-digital converters belongs to the technical field of digital-analog mixed signal processing. The first input terminal of the comparator output generation circuit and the offset compensation generation circuit in the circuit is connected to the first clock signal, The second input terminal of the comparator output generation circuit and the offset compensation generation circuit is connected to the comparison result of the comparator, and the output end of the comparator output generation circuit and the output end of the offset compensation generation circuit are respectively connected to the output adjustment circuit of the analog-to-digital converter. Two input ends, the clock input end of the AD converter output adjustment circuit is connected to the second clock signal, and the output data signal and overflow signal of the AD converter are drawn from the output end of the AD converter output adjustment circuit. The setting function set by the circuit improves the conversion speed of the analog-to-digital converter, and at the same time adjusts the output signal by adding compensation bits and using the output adjustment circuit to eliminate errors that may be caused by early setting and generate overflow signals.

Description

Technical field [0001] The invention relates to an offset compensation circuit for successive approximation analog-to-digital converters, belonging to the technical field of digital-analog mixed signal processing. Background technique [0002] The successive approximation analog-to-digital converter is one of the most popular high-speed and high-precision analog-to-digital converter structures. In the common successive approximation analog-to-digital converter circuit realized by switched capacitor networks, the time of capacitor charging and discharging is the influence The decisive factor of the conversion rate is the decrease in the conversion rate of the analog-to-digital converter due to the increase of the capacitor charge and discharge time constant. Summary of the invention [0003] Technical problem: The purpose of the present invention is to provide an offset compensation circuit for successive approximation analog-to-digital converters, which can solve the above-menti...

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Problems solved by technology

[0003] Technical problem: The object of the present invention is to provide an offset compensation circuit for successive approximation analog-to-digital converters, which solves the problem in the above-mentioned prior art that the conversion of analog-to-digital converters is caused by the increase of the capacitor charging and discharging time constant. To solve the problem of rate reduction, increase the conversion rate of successive approximation analog-to-digital converters

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