基于恒流二极管(CRD)的运算放大器低功耗研究

The research of low power consumption about OPAMP based on the CRD

基于CRD对741双极型通用集成运放进行改进研究,通过CRD替代双极型集成运算放大器(OPAMP)输入级及偏置电路中做为恒流源的双极型器件,并利用Multisim 10和Cadence进行设计与仿真。结果表明,当电源电压改变时,双极型运算放大器输入级电流在0.290 m A到0.433 m A变化,而基于CRD的差分输入级电流恒定在0.239 m A到0.244 m A之间,且电流变化只有0.005 m A。当电源电压恒定在13 V时,双极型运算放大器偏置电流达到0.739 m A,而基于CRD偏置电路电流只有0.222 m。由此可知,基于CRD的运算放大器能实现更低功耗。

This paper is based on the research on how to improve the 741 general integrated op-amp, and used the CRD as a bipolar device of the constant current source to replace the input stage of the bipolar integrated OPAMP and bias circuit, using Multisim 10 and Cadence to design and simulate. Results show that when the supply voltage is changed, the current of the bipolar operational amplifier＆#39;s input stage changes from 0.290 mA to 0.433 mA ,while the current based on the CRD changes from 0.239 mA to 0.244mA ,which only change 0.005 mA. When the supply voltage stays 13 V, the current of the bipolar integrated operational amplifier bias is 0.739 mA, while the current based on CRD bias circuit is only 0.222 mA. To be concluded, lower power can be achieved based on the CRD operational amplifier.