A) \[{{A}_{V}}=150,\,\,{{V}_{out}}=1.8\,V,\] and power gain \[=9000\]
B) \[{{A}_{V}}=20,\,{{V}_{out}}=1V,\]and power gain \[=2000\]
C) \[{{A}_{V}}=150,\,{{V}_{out}}=1.5V,\] and power gain \[=8500\]
D) \[{{A}_{V}}=20,\,{{V}_{out}}=1.5V,\] and power gain\[=2000\]
Correct Answer: A
Solution :
[a] Voltage gain \[{{A}_{V}}=\beta =\frac{{{R}_{C}}}{{{R}_{B}}}=60\times \frac{5\times {{10}^{3}}}{2\times {{10}^{3}}}=150\] Power gain \[={{\beta }^{2}}\frac{{{R}_{C}}}{{{R}_{B}}}=60\times 60\times 2.5=9000\] Base current \[={{I}_{B}}=\frac{12\times {{10}^{-3}}}{2\times {{10}^{3}}}=6\times {{10}^{-6}}A\] \[{{I}_{C}}=\beta {{I}_{B}}=60\times 6\times {{10}^{-6}}=3.6\times {{10}^{-4}}A\] Output \[={{I}_{C}}{{R}_{L}}=3.6\times {{10}^{-4}}\times 5\times {{10}^{3}}\Omega =1.8V\]You need to login to perform this action.
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