A new architecture temperature sensor with 0.03°C resolution from −55°C to 125°C

This paper focuses on the design of a digital output, integrated new architecture temperature sensor which is developed for detecting the temperature of MEMS accelerometer interface circuit. The temperature sensor uses voltage shift and amplification technique in order to make full use of input range of the modulator and reduce the requirement on SNR of the modulator. The temperature sensor includes vertical PNP transistors followed by a switched-capacitor amplifier, a 14-bit first-order sigma-delta analog-to-digital converter and a decimation filter. The oversampling ratio of sigma-delta modulator is 1024 and clock frequency of the modulator is 25 KHz. The temperature sensor is designed in 0.35um CMOS process with supply voltage 3.3V. The simulated resolution of the new architecture temperature sensor is 0.03°C in the temperature range from -55°C to 125°C.