Noise considerations in low voltage CMOS integrated temperature sensors

摘要

Ln this paper, we have investigated the noise characteristics of a low-voltage temperature sensor designed in standard CMOS technology. It looks like a traditional temperature sensitive Wheatstone bridge (fabricated using polysilicon resistors layers of positive and negative temperature coefficients), followed by a low-noise low-offset, low supply voltage differential amplifier, which improves the circuit sensitivity to about 20 mV/K. The temperature resolution is about 0.01 degrees. Noise considerations on suitable different OTA amplifiers are also presented and compared with other CMOS and bipolar temperature sensors. (C) 2000 Elsevier Science S.A. All rights reserved. [References: 25]