The input signal given to a a CE amplifier having a voltage gain of 150 is Vi -2 cos 15 t-3- The corresponding output signal will be

The correct option is A 300 cos (15 t+4π3) V_i = 2cos (15t + π3) Voltage gain: A_v = V_oV_i where V_o is the output voltage ∴ V_o = A ...

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Standard XII

Physics

Transistor as an Amplifier

The input sig...

Question

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

300 cos (15 t + \frac{4 π}{3})

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300 cos (15 t + \frac{π}{3})

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75 cos (15 t + \frac{2 π}{3})

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2 cos (15 t + \frac{5 π}{6})

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Solution

The correct option is A $300 cos (15 t + \frac{4 π}{3})$
$V_{i} = 2 cos (15 t + \frac{π}{3})$
Voltage gain: $A_{v} = \frac{V_{o}}{V_{i}}$ where $V_{o}$ is the output voltage
$∴ V_{o} = A_{v} \times V_{i} = 150 \times 2 cos (15 t + \frac{π}{3}) = 300 c o s (15 t + \frac{π}{3})$
But, in CE amplifier, $V_{o}$ and $V_{i}$ have a phase difference of $π$ between them.
$∴ V_{o} = 300 c o s (15 t + \frac{π}{3} + π) = 300 cos (15 t + \frac{4 π}{3})$

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The input signal given to a a CE amplifier having a voltage gain of 150 is Vi=2cos(15 t+π3). The corresponding output signal will be

The correct option is A 300 cos(15 t+4π3)Vi=2cos(15t+π3)Voltage gain: Av=VoVi where Vo is the output voltage∴Vo=Av×Vi=150×2cos(15t+π3)=300cos(15t+π3)But, in CE amplifier, Vo and Vi have a phase difference of π between them.∴Vo=300cos(15t+π3+π)=300cos(15t+4π3)

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