Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 6 (Q.No. 1)
1.
It is desired to design a phase shift oscillator using an FET having a gm = 5000 μSiemen, rd = 40 kΩ and feedback circuit value of R = 10 K. Then value of C for oscillator operation at 1 kHz and that of RD for A = 40 to ensure oscillator action are
Answer: Option
Explanation:
For a FET oscillator, the oscillator frequency is
∴ 
C = 6.4 nF
For FET Oscillator,
|A| = gmRL = 5000 x 10-6 RL
i.e., 40 = 5000 x 10-6 x RL
∴ 
= 8 KΩ
Now, 
Using RL = 8 K and rd = 40 K (given)
We find RD as follows:
∴ 
∴ 
= 10 K
RD = 10 K.
Discussion:
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