7.50 Figure P7.50 shows the circuit of an amplifier fed with a signal source v with a source resistance R: The bias circuitry is not shown. Replace the BJT with its hybrid- equivalent circuit of Fig. 7.24(a). Find the input resistance R„ = v,li, the voltage transmission from source to amplifier input, v,lvg, and the voltage gain from base to collector, v,Ju.. Use these to show that the overall voltage gain v,Jv is given by BR. r,+Rg

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Hi, I need the answer for question 7.50. It would help me very much

7.50 Figure P7.50 shows the circuit of an amplifier fed with
a signal source v, with a source resistance R. The bias
circuitry is not shown. Replace the BJT with its hybrid-7
BO
BO
equivalent circuit of Fig. 7.24(a). Find the input resistance
R = v,li,, the voltage transmission from source to amplifier
Bip
input, v,lvi, and the voltage gain from base to collector,
vlv,. Use these to show that the overall voltage gain v Jv
gm = I/Vr
r,=V7/lg = B/gm
is given by
E
E
BR
r,+R
(a)
(b)
= -
Figure 7.24 Two slightly different versions of the hybrid-n model for the small-signal operation of the BJT.
The equivalent circuit in (a) represents the BJT as a voltage-controlled current source (a transconductance
amplifier), and that in (b) represents the BJT as a current-controlled current source
current amplifier).
Rsig
Re
Rin
Figure P7.50
Transcribed Image Text:7.50 Figure P7.50 shows the circuit of an amplifier fed with a signal source v, with a source resistance R. The bias circuitry is not shown. Replace the BJT with its hybrid-7 BO BO equivalent circuit of Fig. 7.24(a). Find the input resistance R = v,li,, the voltage transmission from source to amplifier Bip input, v,lvi, and the voltage gain from base to collector, vlv,. Use these to show that the overall voltage gain v Jv gm = I/Vr r,=V7/lg = B/gm is given by E E BR r,+R (a) (b) = - Figure 7.24 Two slightly different versions of the hybrid-n model for the small-signal operation of the BJT. The equivalent circuit in (a) represents the BJT as a voltage-controlled current source (a transconductance amplifier), and that in (b) represents the BJT as a current-controlled current source current amplifier). Rsig Re Rin Figure P7.50
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