标题: | 以0.18微米CMOS制程设计一高精准度低功率之温度补偿石英震荡器 Design of a High-precision Low-power Temperature-compensated Crystal Oscillator in 0.18μm CMOS Process |
作者: | 彭玄文 Peng, Hsuan-Wen 赵昌博 Chao, Chang-Po 电控工程研究所 |
关键字: | 石英振荡器;数位控制;温度补偿;低功耗;延迟单元;温度感测器;Crystal oscillator;Digital control;Temperature compensation;Low power;Delay cell;Temperature sensor |
公开日期: | 2013 |
摘要: | 本论文提出一工作频率为16MHz的数位控制石英振荡器和一时域温度感测器之电路设计,其用于在低功耗的行动装置内实现一高精准度之温度补偿石英振荡器。数位控制石英振荡器是基于皮尔斯振荡器的电路架构,并内含两个8位元的切换式电容阵列。数位控制石英振荡器的温度感测是藉由量测由本论文提出之延迟单元的延迟时间对温度的变化达成,其称为时域温度感测器。数位控制石英振荡器和时域温度感测器的电源电压是透过使用两组低压降稳压器稳压在1.2V。本论文所设计的电路已使用台积电0.18微米CMOS制程下线制作成功,其总面积为0.516平方毫米。量测到的8位元数位控制石英振荡器的启动时间约为0.35毫秒,并且在环境温度为25度的条件下,于1kHz频率偏移测得的相位杂讯为-119.93dB/Hz。在温度变化范围从-40度至85度的情况下,量测到补偿后的频率漂移介于+/-0.08ppm的范围内。时域温度感测器在10Hz转换速度条件下,量测到的温度感测解析度为0.45°C/LSB,以及温度感测误差范围为-6.3度至7.1度之间。晶片测得的电流消耗大约为2毫安培。 This thesis 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. The temperature of it is measured with the temperature-dependent delays of proposed delay cell, called time-domain temperature sensor. The supply voltage 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 designed circuit has been successfully fabricated by using TSMC 0.18-μm CMOS process, where the active area is 0.516 mm*mm. The measured start-up time of implement 8-bit digital-controlled crystal oscillator is about 0.35 ms and the measured phase noise of 1 kHz offset at 25°C is -119.93 dB/Hz. The frequency deviation over -40°C to 85°C is within +/- 0.08 ppm after compensation. The measured effective temperature resolution of time-domain temperature sensor is 0.45 °C/LSB and the measured error is within -6.3°C to 7.1°C at 10 Hz conversion rate. The measured current consumption of chip is about 2 mA. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT070160015 http://hdl.handle.net/11536/75496 |
显示于类别: | Thesis |