差分-共集负反馈电路的电性能讨论与仿真

Discussion and Simulation of Differential-Common Collector Circuit of Electrical Properties of the Negative Feedback

采用方框图分析法,对差分-共集电压串联负反馈放大电路进行理论计算.EWB仿真结果表明:开环和闭环电压增益的理论计算与仿真的相对误差分别为0.142%和0.150%,吻合很好;仿真的开、闭环间的电压增益,满足反馈放大器中的基本关系式;开环状态下的输入、输出电阻的理论与仿真,其相对误差分别为2.60%和0.133%.理论计算闭环输入电阻43.50 kΩ,输出电阻72.72Ω,说明电路具有良好的电压放大器性能.

Through block diagram analysis,the paper conducted a theoretical calculation of differential-common collector voltage series negative feedback amplifier circuit.The EWB simulation results showed that the relative error of the theoretical calculation and simulation of the open-loop and closed-loop voltage gain were 0.142% and 0.150% respectively.It is consistently coincidence.The simulation of the open-loop and closed-loop voltage gain were obvious that meet the basic requirement of relationship of the feedback amplifier.The state of the openloop input and output resistance theory and simulation indicates that the relative error were 2.60% and 0.133% respectively.Theoretical calculation closed loop input resistance is 43.50 kΩ,output resistors 72.72 Ω,The voltage amplifier circuit has a good performance.