Journal
IEEE SOLID-STATE CIRCUITS LETTERS
Volume 2, Issue 9, Pages 67-70Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSSC.2019.2937441
Keywords
CMOS temperature sensor; dual zero-crossing (ZC) detection; frequency-locked loop (FLL); one-point trim; RC poly phase filter (PPF); resistor-based temperature sensor
Funding
- National Research Foundation of Korea (NRF) through the Korea government (MSIT, NRF-2016-Global Ph.D. Fellowship Program) [2018R1A4A1025986]
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This letter describes a compact resistor-based temperature sensor intended for the thermal monitoring of microprocessors and DRAMs. It consists of an RC poly phase filter (PPF) that is read out by a frequency-locked loop (FLL) based on a dual zero-crossing (ZC) detection scheme. The sensor, fabricated in 65-nm CMOS, occupies 5800 mu m(2) and achieves moderate accuracy [+/- 1.2. C (3 sigma)] over a wide temperature range (-50 degrees C to 105 degrees C) after a one-point trim. This is 2x better than the previous compact resistor-based sensors. Operating from 0.85 to 1.3-V supplies, it consumes 32.5-mu A and achieves 2.8-mK resolution in a 1-ms conversion time, which corresponds to a resolution FoM of 0.26 pJ.K-2.
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