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Design of CMOS Temperature Sensor Using Ring Oscillator
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 Title & Authors
Design of CMOS Temperature Sensor Using Ring Oscillator
Choi, Jin-Ho;
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 Abstract
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℃.
 Keywords
temperature sensor;ring oscillator;time-to-digital converter;frequency-to-digital converter;
 Language
Korean
 Cited by
 References
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