Question

if RC phase shift oscillator is given to you then how will you find out frequency of oscillation how will you change the frequency of oscillation

Answer 1

Phase shift oscillatoris an RC type oscillator whose output is fed back to its input through a phase shift network consisting of resistors and capacitors in a ladder network.



To give a desired phase shift to the signal, the RC phase shift network is used as a simple resistor-capacitor network as shown above . Depends on your requirement you can use this oscillator either as a single stage RC phase shift network or a three-stage phase shift network.

For sustained oscillations, phase shift of 0 degree or 360 degree and positive feedback it is necessary. To achieve this we shift the input  180 degree through the amplifier stage and another 180 degree through the inverting stage which gets combine and gave a phase shift of either 360 degree  or 0 degree.

You know phase shift oscillator circuit can be designed by using transistors, FET and opamp.