10.3 A 0.12mm2 Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C

Abstract

Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area $(\gt 0.25$ mm2) and have lower operating temperatures $(\le 125 ^{\circ}\mathrm {C})$ [2]–[4]. This work describes a 0.12mm2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve $0.1 ^{\circ}\mathrm {C} (3 \sigma)$ inaccuracy from $- 40 ^{\circ}\mathrm {C}$ to $180 ^{\circ}\mathrm {C}$. Compared to a state-of-the-art WB sensor [4], it occupies $6 \times $ less area and achieves comparable relative accuracy over a 76% wider operating range.