Solve any one question from Q1 and Q2

1 (a)
State and explain three stability factors.

6 M

1 (b)
Consider single stage CE amplifier with R

_{S}=1 kΩ, R_{1}=50 kΩ, R_{2}=2 kΩ, R_{C}=2 kΩ, R_{L}=2 kΩ, h_{fe}=50, h_{re}=2.5×10^{-4}, h_{oe}=25 μ Amp/V, h_{ie}=1.1 kΩ. Calculate: A_{i}, R_{i}and R_{0}.
6 M

2 (a)
Explain diode compensation technique against I

_{CO}.
6 M

2 (b)
Calculate A

_{VS}, A_{is}& R_{0}for the transistor amplifier shown in Fig. (1) having h-parameters h_{ie}=1.1 k h_{fe}=50, h_{re}=2.5×10^{-4}, h_{oe}=1/40k.

6 M

Solve any one question from Q3 and Q4

3 (a)
Draw and explain low frequency response of single stage RC coupled CE amplifier.

6 M

3 (b)
Determine the frequency of Oscillation when RC phase shift oscillator has R=10 k, C=0.01 μf and R

_{C}=2.2k. Also find the minimum current gain needed for this purpose.
6 M

4 (a)
The following measurement were taken while testing an amplifier using square wave input waveform:

i) for frequency of 5 kHz, tr=20 μsec.

ii) for frequency of 100 Hz, there is a sag/tilt of 1 volt in 2.5 volts.

Amplitude as observed on CRO. Determine the bandwidth of the amplifier under test.

i) for frequency of 5 kHz, tr=20 μsec.

ii) for frequency of 100 Hz, there is a sag/tilt of 1 volt in 2.5 volts.

Amplitude as observed on CRO. Determine the bandwidth of the amplifier under test.

6 M

4 (b)
Draw and explain Hartley oscillator.

6 M

Solve any one question from Q5 and Q6

5 (a)
Draw and explain vertically oriental structure of n-p-n power BJT.

6 M

5 (b)
Class A power amplifier has zero signal collector current of 100 mA. If the collector supply voltage is 5 V, determine:

i) Maximum AC power output

ii) Power rating of transistor

iii) Maximum collector circuit efficiency.

i) Maximum AC power output

ii) Power rating of transistor

iii) Maximum collector circuit efficiency.

7 M

6 (a)
Draw and explain class B-push pull power amplifier. State its merits and demerits.

7 M

6 (b)
A power amplifier supplies 3 watt to a load of 6 kΩ. The zero signal DC collector current is 55 mA and the collector current with signal is 60 mA. How much is the percentage second harmonic distortion?

6 M

Solve any one question from Q7 and Q8

7 (a)
Explain the following non-ideal current voltage characteristics of MOSFET:

i) Finite output resistance

ii) Body effect

iii) Subthreshold conduction.

i) Finite output resistance

ii) Body effect

iii) Subthreshold conduction.

6 M

7 (b)
Calculate the drain current and drain to source voltage of common source circuit shown in Fig. 2. Given: V

_{TN}=1 V, K_{n}=0.1 mA/V^{2}.

7 M

8 (a)
Draw and explain constant current source biasing circuit for EMOSFET.

6 M

8 (b)
For the circuit shown in Fig 3. determine the small signal voltage gain. Assume parameters V

_{GSQ}=2.12 V, V_{DD}=5 V, R_{D}=2.5 kΩ, V_{TN}=1 V, K_{n}=0.8 mA/V^{2}, λ=0.02 V^{-1}. Assume the transistor is biased in the saturation region.

7 M

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