一种用于SPIC的新型电流控制模式弛张振荡器  

A Novel Current-Control-Mode Relaxation Oscillator for SPIC's

作　　者：贺江平[1] 方健[1] 张波 李肇基[1] 

机构地区：[1]电子科技大学IC设计中心,四川成都610054

出　　处：《微电子学》2004年第2期155-157,160,共4页Microelectronics

基　　金：模拟集成电路国家重点实验室基金资助项目(00JS09 7 1 DZ0223)

摘　　要：　提出了一种用于单片开关电源的新型电流控制模式弛张振荡器。该电路利用电流比较器替代电压比较器,能使其输出锯齿波转换时间减小为常规结构的1/10。在电路工作原理进行分析的基础上,对振荡器频率的温度特性、工艺变化等进行了Peak PeakCorner仿真。结果表明,电路的输出锯齿波转换时间在100ns以内,从而可以提高PWM控制器的性能。A novel current-control-mode relaxation oscillator for SPIC is presented. In the oscillator, a current comparator is used in replace of a voltage comparator, which reduces the state conversion time of the generated sawtooth wave to 1/10 of the conventional topology. Based on the analysis of operational principle of sub-blocks, peak-to-peak corner analysis is conducted to evaluate the oscillator's performance. Results show that the output of the circuit is closer to the ideal sawtooth wave, thus improving the performance of the PWM controller.

关 键 词：SPIC 弛张振荡器 电流控制 电流比较器 转换时间 PWM控制器 

分 类 号：TN753.8[电子电信—电路与系统]