Example 

Design a RC phase shift oscillator which will oscillate at 100 Hz.

Solution:

An RC phase shift oscillator by using OPAMP is shown in figure. OPAMP is used as an inverting amplifier and provides the phase shift of 180°. RC network is used in feedback to provide additional 180° phase shift.

Figure

For an RC phase shift oscillator frequency can be given as follows

Let C = 0.5 µF. Then

Therefore, Rf= 29 R = 29 (1300Ω) = 37.7 kΩ.

The complete circuit is shown in the figure. R_f  is made adjustable so the loop gain can be set precisely to 1.

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