Disorder bit compensation circuit for gradual approaching A/D converter

Abstract

The invention relates to disorder place compensation circuit which is used for successive approximation type analog to digital converter, belongs to the digital-analog composite signal processing technology area, in the circuit the first inout end of the comparator outputs produce circuit and disorder place compensate produce circuit connects the first clock signal, the second input end of the comparator outputs produce circuit and disorder place compensate produce circuit connects the comparator compare result, the output of the comparator outputs produce circuit and disorder place compensate produce circuit separately corresponding connects the two input ends of the analog to digital converter output adjustment circuit, the clock input end of which connects the second clock signal, and lead out the output data signal and overflow signal of the analog to digital converter from the analog to digital converter output adjustment circuit. The set fuction of the circuit enhances transferring speed of the analog to digital converter, in the meantime, adjustes the output signal through increase compensation place and use the output adjustment circuit, eliminates the error by set in advance and produces the overflow signal.

Description

technical field [0001] The invention relates to an offset compensation circuit for a successive approximation analog-to-digital converter, 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 implemented by a switched capacitor network, the capacitor charging and discharging time is the most important factor. The decisive factor of the conversion rate is that the conversion rate of the analog-to-digital converter decreases due to the increase of the capacitor charging and discharging time constant. Contents of the invention [0003] Technical problem: The object of the present invention is to provide an offset compensation circuit for successive approximation analog-to-digital converters, which s...

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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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