P2.24 A two-transistor series voltage feedback amplifier is shown in Figure P2.24(a). This AC equivalent circuit neglects the bias resistors and the shunt capacitors. A block diagram representing the circuit is shown in FigureP2.24(b). This block diagram neglects the effect of hre, which is usually an accurate approximation, and assumes that R2+RL>>R1. (a) Determine the voltage gain Vo(s)/Vin(s). (b) Determine the current gain ic2/ib1. (c) Determine the input impedance Vin(s)/Ib1(s). Ta(8) 1 R+ hjel Biß2 R1 Vin(s) Vo(s) 8. R2 (1 +B,)R| Vin(8) Vej(s). Vej(8) R1 R + R2 (a) (b) Figure P2.24 Feedback amplifier.
P2.24 A two-transistor series voltage feedback amplifier is shown in Figure P2.24(a). This AC equivalent circuit neglects the bias resistors and the shunt capacitors. A block diagram representing the circuit is shown in FigureP2.24(b). This block diagram neglects the effect of hre, which is usually an accurate approximation, and assumes that R2+RL>>R1. (a) Determine the voltage gain Vo(s)/Vin(s). (b) Determine the current gain ic2/ib1. (c) Determine the input impedance Vin(s)/Ib1(s). Ta(8) 1 R+ hjel Biß2 R1 Vin(s) Vo(s) 8. R2 (1 +B,)R| Vin(8) Vej(s). Vej(8) R1 R + R2 (a) (b) Figure P2.24 Feedback amplifier.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:P2.24 A two-transistor series voltage feedback amplifier is shown in Figure P2.24(a). This AC
equivalent circuit neglects the bias resistors and the shunt capacitors. A block diagram
representing the circuit is shown in FigureP2.24(b). This block diagram neglects the effect
of hre, which is usually an accurate approximation, and assumes that R2+RL>>R1. (a)
Determine the voltage gain Vo(s)/Vin(s). (b) Determine the current gain ic2/ib1. (c)
Determine the input impedance Vin(s)/Ib1(s).
I(s) Rg
| 'b1(s)
l2(s)
Biß2
RL
Vin(s)
R+hjel
V(s)
8.
R2
(1+Bj)R|
Vin(8)
V1(s)
Vej(s)
+
RV(s)
R1
R¡ +R2
(a)
(b)
Figure P2.24 Feedback amplifier.
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