This brief presents a 0.65% relative inaccuracy CMOS temperature sensor with a duty-cycle-modulated (DCM) output. It uses a BJT-based front-end to generate a proportional to absolute temperature voltage (VPTAT) and a complementary to absolute temperature voltage (VCTAT), which are then modulated to a digital-friendly duty-cycle output. Dynamic element matching with Kelvin connection (KC-DEM) is applied to improve the accuracy of VPTAT. To enhance the robustness of the sensor, a continuous-time dynamic single-threshold hysteresis comparator with high energy efficiency is proposed. Implemented in a standard 0.13-m CMOS process, the sensor has an active area of 0.086 mm2 and achieves an inaccuracy of ±0.54 ∘C (3σ) from -40 ∘C to 125 ∘C.
|Number of pages||5|
|Journal||IEEE Transactions on Circuits and Systems II: Express Briefs|
|Publication status||Published - 2021|
- Circuits and systems
- CMOS temperature sensor
- low relative inaccuracy
- Temperature sensors