The input signal given to a CE amplifier having a voltage gain of 150 is Vi = 2cos(15t + π/3). The corresponding output signal will be (a) 2cos (15t + 5π/6) (b) 300cos (15t + 4π/3) (c) 300cos (15t + π/3) (d) 75cos (15t + 2π/3)

Answer: (b). Output amplitude = AV × 2 = 150 × 2 = 300. A CE amplifier reverses phase, so add π: π/3 + π = 4π/3. Vo = 300cos (15t + 4π/3) So the answer is (b).

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Junction Transistor

The input signal given to a CE amplifier having a voltage gain of 150 is Vi = 2cos(15t + $\frac{\pi}{3}$ ). The corresponding output signal will be

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Answer: (b)

Output amplitude $= A_V \times 2 = 150 \times 2 = 300$ .
A CE amplifier reverses phase, so add $\pi$ : $\dfrac{\pi}{3} + \pi = \dfrac{4\pi}{3}$ .
$V_o = 300\cos\left(15t + \dfrac{4\pi}{3}\right)$
So the answer is (b).

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