Q4. The BJT in the common-base (CB) amplifier in Figure 4 has Figure 4 B=100, V = 0.7 v. in the active mode. The coupling capacitors are very large. The Žs kn Ce output resistance r, of the transistor can be neglected. 20 k2 (a) For I =1.2 mA, calculate the bias values of the collector voltage Vc and the emitter voltage VE (10 pts). (b) Calculate the small-signal parameters (g,, ) and draw the small-signal equivalent circuit of the amplifier. (10 pts) 0.5 ko Ca (c) Find the overall voltage gain G, defined as G, = V. (10 pts) sig

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Q4. The BJT in the common-base (CB) amplifier in Figure 4 has
Figure 4
ES kn
B= 100, Va = 0.7 v.
in the active mode. The coupling capacitors are very large. The
output resistance r, of the transistor can be neglected.
20 k2
(a) For I =1.2 mA, calculate the bias values of the collector
voltage Vc and the emitter voltage VE (10 pts).
(b) Calculate the small-signal parameters (g,, ". ) and draw the
0.5 k2
VE
small-signal equivalent circuit of the amplifier. (10 pts)
Vsie
V.
=- (10 pts)
(c) Find the overall voltage gain G, defined as G,
sig
Transcribed Image Text:+12 Q4. The BJT in the common-base (CB) amplifier in Figure 4 has Figure 4 ES kn B= 100, Va = 0.7 v. in the active mode. The coupling capacitors are very large. The output resistance r, of the transistor can be neglected. 20 k2 (a) For I =1.2 mA, calculate the bias values of the collector voltage Vc and the emitter voltage VE (10 pts). (b) Calculate the small-signal parameters (g,, ". ) and draw the 0.5 k2 VE small-signal equivalent circuit of the amplifier. (10 pts) Vsie V. =- (10 pts) (c) Find the overall voltage gain G, defined as G, sig
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