Lect.26: BJT amplifiers(1)
Lect.26: BJT amplifiers(1)
Lect.26: BJT amplifiers(1)
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Lect. 26: <strong>BJT</strong> <strong>amplifiers</strong>Input Resistance for CBElectronic Circuits 1Riirobinυi=iυi= ii−rieυiυi= =r ( β + 1) re∴ i = i −υro i iv = i ⋅ r + i ⋅Ri ro o o Lυi=( i − ) r + ( i −υrπ) Rri o i i LeroRLvi(1 + + ) = ii( ro + RL)r reυi ro + RL ro + RL∴ Rin= = = rei rioRLRL1 + + re+ ro+r rβ + 1If r is very large, R ro in eeIf R is very large, Rin re( β + 1) = r πLππππHigh-Speed Circuits and Systems Laboratory
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