Analog-to-digital converter

Abstract

The invention provides an analog-to-digital converter which comprises capacitor arrays, successive approximate logic circuits, comparators and a digital output logic circuit. When conversion of each level of streamline is completed, each capacitor array uses half of capacitors for analog to digital conversion of the next level of streamline and the other half of the capacitors for capacitor reset by utilizing the charge redistribution and capacitor sharing technology, and collects and quantifies input signals of the next level. Each successive approximate logic circuit selects the reference voltage of each capacitor of the capacitor array according to a comparison result of the comparator in the last level of streamline and / or the reference voltage of a shared capacitor in the last level of streamline. The comparator compares the reference voltage corresponding to the shared capacitor of the streamline with a voltage of input signals to generate a comparison result, and outputs the comparison result to the digital output logic circuit and the successive approximate logic circuit of the next level of streamline; and the digital output logic circuit quantifies the comparison result of each level of streamline digital and outputs digital output signals. The analog-to-digital converter can accelerate the digital to model conversion and reduce power consumption.

Description

technical field [0001] The invention relates to the field of integrated circuits, more precisely, relates to a successive approximation pipeline analog-to-digital converter based on charge redistribution and capacitance sharing. Background technique [0002] As a bridge between continuous analog signals and off-line digital signals, the analog-to-digital converter has an irreplaceable role and is suitable for a large number of mixed analog-digital systems for industrial and consumer applications. The current implementation structures of analog-to-digital converters mainly include full parallel, pipeline, successive approximation, folding interpolation, addition and subtraction ΣΔ, and multi-channel time-division interleaving. These structures have their own advantages and disadvantages, such as: full parallel and folding interpolation Although the conversion speed of the analog-to-digital converter is fast, the number of comparators increases exponentially with the improveme...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an analog-to-digital converter, which is used to solve the problem that the analog-to-digital converter in the prior art cannot simultaneously satisfy the conversion problems of low power consumption, high speed and high precision

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