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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 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.

A 2.5V 0.25㎛ CMOS Temperature Sensor with 4-bit SA ADC