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中文摘要：
在传统的电路基础上对电流、电压基准电路进行补偿，设计一种高精度数字可调CMOS片上振荡器电路。利用电阻和PNP管相反的温度系数产生的自偏置基准电流电路PTAT，NTAT两路电流，叠加得到一路与温度无关的基准电流上，实现了温度补偿；利用电阻网络补偿工艺产生高PSRR带隙基准电路电压的频率误差；数字修调寄存器粗调电流用以选择频率，微调电阻用以调节精度。经流片测试表明，该振荡器频率2MHz，4MHz可选，2MHz可调精度达±0．1％；4MHz可调精度达±0．125％。
英文摘要：
A high accuracy CMOS oscillator on -chip with digital trimming is designed with frequency compensated by improving current and voltage reference circuit to conventional circuit. The self - biased cell provide a reference current that is independent of temperature by superposition PTAT current and NTAT current with the opposite temperature coefficient of resistor and PNP. A high PSRR bandgap circuit with resistor trim to minimize process compensation. The frequency can be selected with digital trimming by changing current and tuned with resistor array. The engineering verification test shows up that the oscillator provide a selectable 2 MHz or 4 MHz clock and about ±0.1% frequency variation at 2 MHz and ±0. 125% frequency variation at 4 MHz.
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