摘要
基于传统RC振荡器的理论分析,采用电阻串分压提供参考电压的方式,设计了一种低电源电压灵敏度的振荡器。基于HHNEC 0.5μm BiCMOS工艺,完成了HSPICE仿真。仿真结果显示,该振荡器输出一个频率为63kHz、占空比为50%的方波信号,当电源电压在4.5～5.5V之间变化时,频率变化范围在±0.52%内,有效降低了电源电压对振荡频率的影响。该振荡器可应用于开关电源芯片。
Based on theoretical analysis of traditional RC oscillator,an oscillator structure with low supply voltage sensitivity was proposed using resistor string to provide reference voltage.Hspice simulation was made based on HHNEC 0.5 μm BiCMOS process,and results showed that the oscillator could generate a sqare-wave signal with 63 kHz frequency and 50% duty cycle,and it had a frequency variation within ±0.52% when the power supply voltage changed from 4.5 V to 5.5 V,effectively reducing effects of supply voltage on frequency.The oscillator structure is applicable for switching power supply IC＇s.
出处
《微电子学》
CAS
CSCD
北大核心
2012年第1期30-33,共4页
Microelectronics
关键词
低电源电压灵敏度
RC振荡器
电阻串
Low supply voltage sensitivity
RC oscillator
Resistor string
