Chapter: Electronic Circuits : Feed Back Amplifiers
Input Impedance of Emitter Follower
Fig. 1.14 (i) shows the circuit of a loaded emitter follower. The a.c. equivalent circuit with T model is shown in Fig. 1.14 (ii).
Input Impedance of Emitter Follower
Fig. 1.14 (i) shows the circuit of a loaded emitter follower. The
a.c. equivalent circuit with T model is shown in Fig. 1.14 (ii).
As for CE amplifier, the input impedance of emitter follower is the
combined effect of biasing resistors (R1 and R2) and the input impedance of
transistor base [Zin (base)]. Since these resistances are in
parallel to the ac signal, the input impedance Zin of the emitter
follower is given by :
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Electronic Circuits : Feed Back Amplifiers : Input Impedance of Emitter Follower |
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Electronic Circuits : Feed Back Amplifiers