Design of Low Power Temperature Sensor Based on Full Resistance Frequency Domain Readout

Abstract

Combining with on-chip heat management application scenario, firstly, this paper introduces the advantages of resistance-based frequency-domain readout all-digital temperature sensor and its poor ability to resist power supply fluctuation, as well as the existing solutions, the basic principle of digital temperature sensor with anti-power fluctuation suppression is analyzed, and its feasibility is proved by system modeling and theoretical analysis. Secondly, based on the proposed architecture, a new kind of near-digital temperature sensor architecture is proposed, which adopts a ring oscillator dominated by leakage current, thus it can work directly in a wide voltage range from 0.8 V to 1.3 V without the need for a separate regulator. Finally, to further optimize the power consumption, a delay cell structure with lower power consumption and stronger robustness is proposed to further reduce the overall power consumption. The results show that the improved temperature sensor achieves lower power consumption and higher energy efficiency while keeping a small area, and it is advanced compared with other high level temperature sensors.