Transistors are nonlinear devices, which can produce nonlinear distortion in amplifier while amplifying signals.For weak nonlinear distortion, the expressions of total harmonic distortion (THD), the second-order intermodulation distortion (IM2), the third-order intermodulation distortion(IM3) and intercept point (IP3) are deduced.With the aid of software Multisim, we simulate transistor common-emitter amplifier, transistor common-emitter amplifier with resistor in emitter, differential amplifier and differential amplifier with resistor between emitters. The simulational results and theoretical analyses are almost the same.%晶体管是非线性器件,在放大信号时会产生非线性失真.针对弱非线性失真,推导了总谐波人(THD)、二阶互调失真(IM2)、三阶互调失真(IM3)和截点(IP3)的表达式,借助于Multisim软件,对晶体管共发放大器、发射极带反馈电阻的失发放大器、差分放大器和发射极间带反馈电阻的差分放大器进行了仿真,并与理论结果作了比较,结果令人满意.
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机译：Transistors are nonlinear devices, which can produce nonlinear distortion in amplifier while amplifying signals.For weak nonlinear distortion, the expressions of total harmonic distortion (THD), the second-order intermodulation distortion (IM2), the third-order intermodulation distortion(IM3) and intercept point (IP3) are deduced.With the aid of software Multisim, we simulate transistor common-emitter amplifier, transistor common-emitter amplifier with resistor in emitter, differential amplifier and differential amplifier with resistor between emitters. The simulational results and theoretical analyses are almost the same.%晶体管是非线性器件,在放大信号时会产生非线性失真.针对弱非线性失真,推导了总谐波人(THD)、二阶互调失真(IM2)、三阶互调失真(IM3)和截点(IP3)的表达式,借助于Multisim软件,对晶体管共发放大器、发射极带反馈电阻的失发放大器、差分放大器和发射极间带反馈电阻的差分放大器进行了仿真,并与理论结果作了比较,结果令人满意.
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