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Q2]
A) Solve any Two: 5 marks each
i. Explain the steps involved in filter designing by insertion loss method.
ii. Discuss the working of fractional N-frequency Synthesizer.
iii. Show that both ports of a two-port negative resistance oscillator oscillate.
B) Solve any One: 10 marks each
i. Explain the following power amplifier performance parameter:
- Amplifier efficiency and power added efficiency.
- 1-dB compression point.
- 1-dB compression gain.
- Dynamic Range.
- Load Pull Contours.
ii. The S-parameters at 10 GHz for a microwave transistor with a 50 ohms reference impedance are:
- S11 = 0.45∠150°,
- S12 = 0.01∠-10°,
- S21 = 2.05∠10°,
- S22 = 0.40∠-150° The source impedance is 20 ohms and the load impedance is 30 ohms. Calculate the power gain, the available gain and the transducer power gain.
Q3]
A) Solve any Two: 5 marks each
i. Why in single point ground system undesirable at high frequency ? How multipoint ground system overcomes this problem ?
ii. Explain the mixer characteristics: Image frequency, Conversion loss, noise figure of SSB and DSB signal.
iii. Discuss the types of stability in an Amplifier Design.
B) Solve any One: 10 marks each
i. Explain:
- Radiation and Conduction Coupling modes.
- Common Mode Coupling Mechanism
ii. Design m-derived T section of LPF having cut-off frequency 5 KHz and nomonal characteristics impedance of 600 ohm.The frequency of infinite attenuation is 1.25 times the cut-off frequency.
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