A 2.5V 0.25㎛ CMOS Temperature Sensor with 4-bit SA ADC
4-비트 축차근사형 아날로그-디지털 변환기를 내장한 2.5V 0.25㎛ CMOS 온도 센서

Mungyu Kim, Young-Chan Jang
2013 The Journal of the Korean Institute of Information and Communication Engineering  
In this paper, a CMOS temperature sensor is proposed to measure the internal temperature of a chip. The temperature sensor consists of a proportional-to-absolute-temperature (PTAT) circuit for a temperature sensing part and a 4-bit analog-to-digital converter (ADC) for a digital interface. The PTAT circuit with the compact area is designed by using a vertical PNP architecture in the CMOS process. To reduce sensitivity of temperature variation in the digital interface circuit of the proposed
more » ... of the proposed temperature sensor, a 4-bit successive approximation (SA) ADC using the minimum analog circuits is used. It uses a capacitor-based digital-to-analog converter and a time-domain comparator to minimize power consumption. The proposed temperature sensor was fabricated by using a 0.25µm 1-poly 6-metal CMOS process with a 2.5V supply, and its operating temperature range is from 50 to 150 °C. The area and power consumption of the fabricated temperature sensor are 130 × 390 µm² and 868 µW, respectively. 키워드 온도 센서, PTAT, 축차근사형 아날로그-디지털 변환기 Key word Temperature sensor, PTAT, successive approximation analog-to-digital converter Open Access http://dx.
doi:10.6109/jkiice.2013.17.2.378 fatcat:6jmryiuw4vfofgo23noc7wlhqa