新式高精準度互補式金氧半積體電路之溫度感測計的設計

A Novel High-accuracy CMOS Temperature Sensor Design

羅允中(Yung-Chung Lo)

指導教授 ： 金雅琴

國立清華大學/電機資訊學院/電子工程研究所/碩士(2006年)

摘要

無資料

關鍵字

溫度感測計 ； 帶隙參考電壓 ； 正比絕對溫度 ； 互補式金氧半

並列摘要

CMOS temperature sensors have been used extensively in the computer-based applications. The accuracy level of a CMOS temperature sensor is limited by the temperature sensing device, circuit schemes and non-idealities such as mismatches in components, absolute variations and offset voltage in Op-amplifier. These factors usually affect the accuracy of sensors most. Accordingly, the accuracy level and non-idealities of typical voltage-base and current-base temperature sensors are analyzed in detail. This study provides guidelines for designing a high-accuracy temperature sensor. Based on these guidelines, a high-accuracy temperature sensor design is proposed. This design adopts second-order correction and piece-wise-linear techniques to reduce the error caused by the non-linear characteristics of a BJT device. Furthermore, dynamic offset-cancellation techniques are used to reduce the error caused by non-ideal factors in the sensor. By injecting 1% mismatch and 10% absolute variation in various components and 1mV Op-Amp offset voltage in the sensor, this temperature sensor has the best expected accuracy of 0.3°C from -55°C to 125°C. This result is sufficient to expand the applications of CMOS temperature sensors to high precision applications.

並列關鍵字

Temperature Sensor ； Bandgap Reference Voltage ； PTAT ； CMOS ； Chopper OP ； sigma-delta ADC