单电源直流耦合运算放大器设计方法的研究

Design Method of Single Power Direct Current-coupled Operational Amplifier

为了解决直流耦合运算放大器采用单电源供电的复杂性问题,给出了直流耦合放大器在同相和反相输入下的通用设计方法,拓展了信号的动态范围。为了保证通用电路工作的稳定性,分析了运放电路振荡的原因、发生振荡的常见位置,并给出了消除振荡的措施。最后,为了验证单电源供电下不同配置电路的正确性,采用Multisim软件对所设计电路进行了仿真实验,实验结果表明实测指标和理论指标非常接近,实现了预期目标。

In order to solve the complexity of using single power supply in DC coupled operational amplifiers,the general design method that Direct Current-coupled amplifiers operate in both in-phase and inverse-phase input modes is given,which extends the dynamic range of the signal.In order to ensure the stability of the universal circuit,the reason and common position,which operational amplifier circuit induces oscillation,are analyzed and the measures are given to eliminate the oscillation.Finally,in order to verify the correctness of different configuration circuits of single power supply,the designed circuit is simulated with Multisim software.The experimental results show that the measured index is very close to the theoretical index and the expected target is achieved.