【摘要】 设计了一种采用带隙输入结构的误差放大电路,其带隙基准电压由电路内部产生,第二级共源共栅电路产生高增益。电路在产生带隙基准电压的同时也能检测反馈电压的变化,从而简化了电路结构,降低了静态功耗,节省了芯片面积。设计工艺采用BCD 0.6-μm BICMOS,文章的最后给出了仿真结果。此误差放大电路的低频增益达到68dB,相位裕度为63度,带宽高达82MHz。此电路已应用到DC-DC变换器芯片设计项目中。更多还原

【Abstract】 An error-amplifier circuit using bandgap input structure is presented.The bandgap reference voltage is self-generated by the circuit,the open-loop gain is mainly provided by the second stage cascode circuit.As the bandgap reference voltage is self-generated,the variety of feed back voltage is detected.Based on the simplified structure,the static power comsuption is reduced and chip’s area is also saved.This circuit is designed on the BCD 0.6-μm BICMOS process and its simulation results are presented.The error amplifier has a low frequence gain of 68 dB,a phase margin of 63 degree,a bandwidth of 190kHz,and a high frequence gain of 50dB.The circuit has been applied in chip design project of DC-DC convertor.更多还原