Publisher : The Korean Institute of Information and Commucation Engineering
DOI : 10.6109/jkiice.2015.19.9.2081
Title & Authors
Design of CMOS Temperature Sensor Using Ring Oscillator Choi, Jin-Ho;
The temperature sensor using ring oscillator is designed by 0.18㎛ CMOS process and the supply voltage is 1.5volts. The temperature sensor is designed by using temperature-independent and temperature-dependent ring oscillators and the output frequency of temperature-independent ring oscillator is constant with temperature and the output frequency of temperature-dependent ring oscillator decreases with increasing temperature. To convert the temperature to a digital value the output signal of temperature-independent ring oscillator is used for the clock signal and the output signal of temperature-dependent ring oscillator is used for the enable signal of counter. From HSPICE simulation results, the temperature error is less than form -0.7℃ to 1.0℃ when the operating temperature is varied from -20℃ to 70℃.
temperature sensor;ring oscillator;time-to-digital converter;frequency-to-digital converter;
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