Q. In a practical RC oscillator, to meet phase shift requirement we need

A
1 RC section
B
2 RC section
C
3 RC section
D
No RC section
Solution:

The values of R and C have been chosen so that at the required frequency the output voltage leads the input voltage by an angle of about 60degree. Then the phase angle between each successive RC section increases by another 60degree giving a phase difference between the input and output of 180degree (3 x 60degree)

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