Electronics and Communication Engineering - Exam Questions Papers - Discussion

Discussion Forum : Exam Questions Papers - Exam Paper 7 (Q.No. 21)
21.
A Hartley oscillator uses FET with gm of 2 ms and rd = 2 KΩ. The total coil inductance is 10 μH with turns ratio of input to output side of 1 : 10. It is tuned with a 50 pf capacitor. Find frequency of oscillations, amplifier gain margin in dB.
7.11 MHz, 13.97 dB
7.3 MHz, 14.1 dB
6.93 MHz, 12.9 dB
7.4 MHz, 13 dB
Answer: Option
Explanation:

= 7.11 MHz

μ = gm x rd

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