摘要
采用 UMC 0.6μm BCD 工艺,设计了一种高性能双频振荡电路,并成功地将其应用于一款高效率、宽输入电压范围的 DC-DC 降压型开关变换器中。该电路作为整个芯片的核心模块之一,采用双电容充放电技术和 RS 触发机制,实现方波信号高、低电平时间精确可控。仿真结果表明,在考虑偏置电流、电源电压、温度以及 MOSFET 工艺波动的容差时,该振荡器的正常工作频率和占空比的最大偏差分别为7%和5%。
A high performance, dual-frequency oscillator circuit based on UMC 0.61μm BCD process is designed for a high efficiency, wide input voltage range step-down DC-DC converter. As one of the core sub-blocks, the oscillator utilizes dual-capacitor charging and discharging techniques and RS trigger to realize the cycle time of the square-wave being accurately adjustable .Simulation results show that the maximum deviation of frequency and duty cycle are respectively 7% and 5% under the tolerance of bias current, power voltage, temperature and MOSFET process.
出处
《电子技术应用》
北大核心
2008年第11期61-64,共4页
Application of Electronic Technique
