Chip design of a high conversion rate time-domain temperature sensor with temperature compensated oscillator

• Main Authors: HAN, KAI-LIN, 韓凱霖
• Other Authors: LEE, WEN-TA
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/9tq797

碩士 === 國立臺北科技大學 === 電子工程系 === 107 === With the advancement of integrated circuit technology, increasing number of electronic instruments are designed with high circuit density. In this situation, overheat is a very important issue, so we need a temperature sensor for thermal management. In this thesis, we proposed a high conversion rate time-domain temperature sensor with temperature compensated self-oscillation, which uses a time-amplified temperature-dependent delay line to perform the delay. Compared with the traditional temperature delay line, the time-amplified temperature-dependent delay line can greatly reduce the power consumption and the number of transistors used. We also added a temperature compensated oscillator to provide a high-frequency signal for the temperature sensor and to reduce the costs of the instruments and their noise contribution to the circuit. This chip has been implemented in the TSMC 0.18μm 1P6M CMOS technology, and the supply voltage is 1.2 V. The oscillator frequency is 602 MHz. At a conversion rate of 146 kHz, the energy consumption per conversion is 9.83 nJ. The core area of chip is 0.149 mm2. The temperature measurement range is from 20 to 80 oC with a resolution of 0.48 oC/bit and a measurement error between -0.61 and 0.46 oC. Based on the simulation results, the oscillation frequency is close to the required system frequency. During the actual measurement, the temperature sensor had high conversion rate and resolution and outputted correct digital codes, making it suitable for thermal management in SoCs.