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提出了一种对石英晶体振荡器进行温度补偿的模数混合方法。该补偿芯片基于0.18μm标准CMOS工艺实现。采用模拟补偿网络和基于非挥发存储器的数字补偿网络相叠加的方法,对晶体振荡器进行间接补偿,实现了数模混合的片式化,降低了存储器的容量。该方法不需要高压CMOS和EEPROM浮栅器件,降低了工艺成本和功耗。补偿结果显示,温度频率稳定度达到10-7/-40℃～85℃,系统功耗为1.79mA@1.8V。
A new method for temperature compensation of quartz crystal oscillator is proposed. The compensation chip is based on a 0.18μm standard CMOS process. Adopting the method that the analog compensation network and the digital compensation network based on non-volatile memory are stacked together, the crystal oscillator is indirectly compensated to realize the hybridization of the digital-analogue chip and reduce the memory capacity. This method does not require high voltage CMOS and EEPROM floating gate devices, reducing process costs and power consumption. Compensation results show that the temperature and frequency stability of 10-7 / -40 ℃ ~ 85 ℃, the system power consumption of 1.79mA@1.8V.