標題: A New Small-Sized Pierce Crystal Oscillator Readout with Novel on-Chip All-Digital Temperature Sensing and Compensation
作者: Peng, Hsuan-Wen
Su, Chung-Hsin
Chao, Paul C. -P.
Hsieh, Jing-Wen
Chang, Chun-Kai
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Crystal oscillator;Digital control;Temperature compensation;Low power;Delay cell;Temperature sensor
公開日期: 2014
摘要: This paper presents a 16-MHz digital-controlled crystal oscillator and a time-domain temperature sensor design to achieve a high precision temperature-compensated crystal oscillator in a low-power mobile device. The digital-controlled crystal oscillator is based on Pierce topology with two 8-bit switched-capacitor arrays and the temperature of it is measured by time-domain temperature sensor. For noise reduction, the supply voltages of digital-controlled crystal oscillator and time-domain temperature sensor are regulated at 1.2 V by using two on-chip low-dropout regulators. The proposed circuit design has been successfully fabricated by using TSMC 0.18-mu m CMOS process, where the active area is 0.516 mm(2). The measured start-up time of fabricated 8-bit digital-controlled crystal oscillator is about 0.35 ms and the measured phase noise of 1 kHz offset at 25 degrees C is -119.93 dB/Hz. With temperature compensation, the frequency deviation of it is within +/- 0.08 ppm over -40 degrees C to 85 degrees C. The measured effective temperature resolution of time-domain temperature sensor is 0.45 degrees C/LSB and the measured error is within -6.3 degrees C to 7.1 degrees C at 10 Hz conversion rate. The measured current consumption of chip is about 2 mA.
URI: http://hdl.handle.net/11536/135335
ISBN: 978-1-4799-0161-6
ISSN: 1930-0395
期刊: 2014 IEEE SENSORS
顯示於類別:會議論文