For the common-emitter amplifier shown in Figure 1 , let VCC = 9 V, R1

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For the common-emitter amplifier shown in Figure 1 , let VCC = 9 V, R1 = 27 kΩ, R2 = 15 kΩ, RE = 1.2 kΩ, and RC = 2.2 kΩ. The transistor has β = 100, VT = 25 mV, VA = ∞ and VBE = 0.7 V. Calculate the DC bias current IE. If the amplifier operates between a source for which RS = 10 kΩ and a load of 2 kΩ, replace the transistor with its hybrid- π model, and find the values of Ri and the voltage gain v0/vs. Figure 1

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For the common-emitter amplifier shown in Figure 1 , let

V_{C C} = 9 V, R_{1} = 27 k Ω, R_{2} = 15 k Ω, R_{E} = 1.2 k Ω

, and

R_{C} = 2.2 k Ω

. The transistor has

β = 100, V_{T} = 25 m V, V_{A}

= \infty

and

V_{B E} = 0.7 V

. Calculate the

D C

bias current

I_{E}

. If the amplifier operates between a source for which

R_{S} = 10 k Ω

and a load of

2 k Ω

, replace the transistor with its hybrid-

π

model, and find the values of Ri and the voltage gain

v_{0} / v_{s}

. . Figure 1

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