A BJT BiCMOS Temperature Sensor with a Two-Point Calibrated Inaccuracy of 0.1°C (3σ) from -40 to 125°C

Abstract

This paper presents a temperature sensor core implemented in standard 0.6µm BiCMOS technology. Due to its intrinsic linearity, the sensor is capable of achieving an inaccuracy of −0.065°C / +0.035°C (3σ) over -40°C to 125°C temperature range after calibration in oil bath at two temperatures. The low output resistance of the core, 5Ω typical value, makes its voltage output signal suitable to be processed by a wide range of analogue-to-digital converters. It also allows multiple instances of the core to be stacked providing a trade-off between noise, supply voltage and silicon area