A current sense amplifier circuit and calibration method

By designing a current-sensing amplifier circuit, and utilizing the switching of the input module, reference voltage module, and feedback module, combined with the offset module to provide additional offset voltage, the problems of offset and temperature drift in the current-sensing amplifier are solved, and accurate voltage detection is achieved.

CN122339416APending Publication Date: 2026-07-03CHENGYI SEMICON (SUZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGYI SEMICON (SUZHOU) CO LTD
Filing Date
2026-03-09
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing current sense amplifiers suffer from offset voltage Vos and component temperature drift, causing the actual amplification factor to deviate from the ideal value and making it impossible to accurately detect voltage.

Method used

Design a current sensing amplifier circuit, including an input module, a reference voltage module, an amplifier, a feedback module, and first and second switches. By switching different states and connecting the reference voltage or the feedback module, combined with the offset module to provide an additional offset voltage, accurate calibration of the sensing voltage can be achieved.

Benefits of technology

It effectively reduces the impact of temperature drift and offset voltage, achieving offset-free and drift-free detection voltage, thus reducing design complexity and cost.

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Abstract

This application discloses a current-sensing amplifier circuit and calibration method, including: an input module, a reference voltage module, an amplifier, a feedback module, a first switch, and a second switch; the input module and the first switch are sequentially connected to the non-inverting input terminal of the amplifier; the input module and the second switch are sequentially connected to the inverting input terminal of the amplifier; the input module is used to switch between providing a non-zero detection voltage or a zero detection voltage to the amplifier; the inverting input terminal of the amplifier is also connected to the output terminal of the amplifier through the feedback module; the reference voltage module is connected in parallel with the first switch, and the reference voltage module is used to switch between directly outputting the reference voltage or outputting the reference voltage by voltage division; the feedback module is used to switch between providing unity gain or fixed gain to the amplifier. The embodiments of this application can accurately calibrate the detection voltage.
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