High-swing analog-to-digital conversion circuit and analog-to-digital converter

By automatically identifying and switching the input voltage path in the analog-to-digital converter, overvoltage or negative voltage is avoided, improving the stability and conversion accuracy of the circuit, reducing costs, and supporting single-ended and differential configurations, thus solving the overvoltage or negative voltage problem in the prior art.

WO2026144567A1PCT designated stage Publication Date: 2026-07-09SHANGHAI INTEGRATED CIRCUIT RESEARCH & DEVELOPMENT CENTER CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SHANGHAI INTEGRATED CIRCUIT RESEARCH & DEVELOPMENT CENTER CO LTD
Filing Date
2025-11-11
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Existing successive approximation register-type analog-to-digital converters are prone to overvoltage or negative voltage when the input range is too large, affecting the stability and reliability of the circuit.

Method used

By automatically identifying and switching the input voltage access path, higher voltages are connected to the positive terminal capacitor array, and lower voltages are connected to the negative terminal capacitor array. By using the input voltage switching circuit and the sub-binary successive approximation register circuit, overvoltage or negative voltage phenomena are avoided in the first voltage switching stage.

Benefits of technology

It improves the stability and conversion accuracy of analog-to-digital conversion circuits, reduces manufacturing costs, and supports single-ended and differential configuration modes, enhancing the applicability of the circuits.

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Abstract

The present application discloses a high-swing analog-to-digital conversion circuit and an analog-to-digital converter, which are applied to the field of analog-to-digital converters. The high-swing analog-to-digital conversion circuit comprises: an input voltage switching circuit and a sub-binary successive approximation register circuit, the input voltage switching circuit comprising four transmission circuits. A first voltage source is connected to a first input terminal and a second input terminal of the sub-binary successive approximation register circuit respectively by means of two transmission circuits in the input voltage switching circuit. A second voltage source is connected to the first input terminal and the second input terminal of the sub-binary successive approximation register circuit respectively by means of two transmission circuits in the input voltage switching circuit. Hence, in the present application, voltage switching at the two input terminals of the sub-binary successive approximation register circuit is achieved by means of controlling on / off of different transmission circuits, thus avoiding the occurrence of overvoltage or negative voltage generated by the sub-binary successive approximation register circuit during an original voltage switching process, and improving the stability of the circuit.
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