A 0.9V Self-Referenced Resistor-Based Temperature Sensor With −0.62/+0.81°C (3σ) Inaccuracy

This brief presents a self-referenced resistor-based temperature sensor that requires no external clock. The sensing element uses the low-noise swing-boosted RC oscillators (RCOSC), of which the jitter is small compared to conventional ring oscillators and achieves an RMS resolution of 0.0565°C. Fabricated at a 28 nm CMOS process, the proposed sensor has a low
$3\sigma $
inaccuracy of–0.62/0.81°C from–40°C to 100°C. It shows an accuracy figure-of-merit (FoM) of 51.9nJ
$\boldsymbol {\cdot \%^{2}}$
while occupying a small area of 0.0092 mm2.