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放大器中非線性失真的研究
RESEARCH ON NONLINEAR DISTORTION IN AMPLIFIERS
- doi:
- 摘要:
- 晶體管是非線性器件,在放大信號時會產生非線性失真.針對弱非線性失真,推導了總諧波人(THD)、二階互調失真(IM2)、三階互調失真(IM3)和截點(IP3)的表達式,借助于Multisim軟件,對晶體管共發放大器、發射極帶反饋電阻的失發放大器、差分放大器和發射極間帶反饋電阻的差分放大器進行了仿真,并與理論結果作了比較,結果令人滿意.
- Abstract:
- 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.
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