一种高精度振荡器设计

A high precision design of oscillator

文章采用华虹BCD350GE工艺设计一种频率为50 kHz仪器仪表芯片专用张弛振荡器。利用低温度系数恒流源对电容进行充放电,在工业温度范围内电流源精度可以达到千分之七,用高性能比较器比较阈值电压,采用修调以及温度补偿技术解决了温度以及工艺偏差的影响,实现高精准振荡器。应用cadence工具进行设计仿真。结果表明所设计的振荡器适用于仪器仪表芯片。

In integrated circuit design,the RC oscillator is affected greatly by operating temperature and process angle.This paper designs a 50KHz frequency instrument chip relaxation generator using BCD350GE technology.The low temperature coefficient constant current source is used to charge and discharge the capacitor,.In the industrial temperature range,the current source accuracy can reach seven per one thousand.And the high performance comparator is used to compare the threshold voltage.Using trimming and temperature compensation techniques achieve high precision oscillators.Apply cadence tools for design,simulation and verification.The results show that it is suitable for instrumentation chip.