A low power temperature sensor and related apparatus

By designing a low-power temperature sensor, utilizing a MOS transistor operating in the subthreshold region and a self-biased structure, high-precision temperature-to-digital conversion is achieved over a wide temperature range, solving the problem of high power consumption in existing temperature sensors. This technology is suitable for scenarios such as IoT terminals, portable medical devices, and system-on-a-chip thermal management.

CN122171043APending Publication Date: 2026-06-09GUANGZHOU UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU UNIVERSITY
Filing Date
2026-01-22
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing temperature sensors based on MOS temperature sensing have high power consumption, short battery life, and difficulty in achieving high-precision temperature-to-digital conversion over a wide temperature range.

Method used

The design employs a low-power temperature sensor, including a temperature sensing module, a current-to-frequency conversion module, and a frequency-to-digital conversion module. It utilizes a MOSFET operating in the subthreshold region and a self-biased structure to achieve high-precision temperature measurement over a wide temperature range through a current-to-frequency-to-digital signal conversion link.

Benefits of technology

High-precision temperature-to-digital conversion is achieved over a wide temperature range under low power consumption constraints, resulting in reduced power consumption and improved temperature measurement accuracy. It is suitable for scenarios such as IoT terminals, portable medical devices, and system-on-a-chip thermal management.

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Abstract

This invention provides a low-power temperature sensor and related devices, belonging to the field of integrated circuit technology. The sensor includes: a temperature sensing module, a current-to-frequency conversion module, and a frequency-to-digital conversion module. The temperature sensing module, connected to the current-to-frequency conversion module, is used to convert ambient temperature into an electrical signal. The temperature sensing module includes a first sensing branch and a second sensing branch. In the first sensing branch, two MOSFETs are respectively biased under the drain-source voltages of the sub-thermal and hot regions, and operate stably in the subthreshold region. In the second sensing branch, two MOSFETs are respectively biased under the drain-source voltages of the sub-thermal and hot regions, and operate stably in the subthreshold region. The current-to-frequency conversion module, connected to the frequency-to-digital conversion module, is used to convert the electrical signal into a frequency signal. The frequency-to-digital conversion module is used to convert the frequency signal into a digital code, aiming to reduce power consumption while achieving high-precision temperature-to-digital conversion over a wide temperature range.
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