This brief presents a 0.9 μW duty-cycle-modulated temperature sensor with a sub-μA peak current for energy harvester-or micro-battery-powered systems. A compact sensing frontend is proposed to achieve low power, together with various device-level leakage and nonlinearity compensation techniques adopted to minimize the sensor error. In addition, a current-starved multivibrator which provides inherent clamping voltages is used for duty cycle modulation for overall energy savings. The sensor designed in 0.18 μm CMOS process achieves a resolution Figure of Merit (FoM) of 10.6 pJ∙K², which is among the most energy-efficient designs to date. Trimmed at 30 °C, the sensor achieves ±0.85 °C precision from -30 °C to 120 °C. The maximum supply sensitivity is 0.7 °C/V for a 1.6 ̴  2 V supply.
|Journal||IEEE Transactions on Circuits and Systems II: Express Briefs|
|Publication status||Accepted/In press - 12 Aug 2017|
- CMOS temperature sensor
- emitter-coupled astable multivibrator.
- Energy resolution
- peak current
- self-regulated BGR
- Temperature sensors
ASJC Scopus subject areas
- Electrical and Electronic Engineering