Crystal-less Clock Generator with Temperature and Supply Voltage Compensation
| Autor: | Chia-Chi Yeh, 葉家齊 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Two on-chip crystal-less clock generator (CLCG) with temperature compensation are presented. For both high speed and low speed applications, this thesis contain two kinds of architectures. The first one is a 8 MHz relaxation oscillator. The voltage and current reference circuits have high immunities of temperature and supply voltage variations. A proposed pulse generator is used to eliminate the loop delay time variation caused by temperature drift. Under the temperature range is form -40 °C to 150 °C, the measured output frequency accuracy is 10.9 ppm/°C. Under the ±10 % supply voltage, the output frequency variations is less than 0.28%. The second architecture is a 768 MHz multi-phase clock generator with temperature compensation. The supply voltage of the multi-phase ring oscillator is from a regulator which has positive temperature coefficient that can compensate the output frequency drift caused by temperature variation. Besides, we apply a temperature coefficient calibration circuit to make sure the output frequency has higher accuracy in the process variations. The output frequency accuracy of 768 MHz is 110.7 ppm/°C, under the temperature range is form -40 °C to 150 °C. In some applications limited by hardware area, traditional crystal oscillator can be replaced with these crystal-less clock generator, and it would consume less cost and area. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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