In this video, the RC phase shift oscillator has been explained and the expression of the frequency for this RC phase shift oscillator has been derived.
By watching this video, you will learn the following topics:
0:29 How RC Phase Shift Oscillator Works
1:45 Simple RC Circuit (Phase Lead Circuit)
5:35 Design of RC Shift Oscillator using Op-amp
7:31 Derivation of the frequency for the RC Phase Shift Oscillator
RC Phase Shift Oscillator:
In this oscillator, the RC network is used in the feedback to generate the stable sine wave. This oscillator is the harmonic oscillator (As it generates the sine wave)
RC Phase shift oscillator is used for low-frequency generation (Up to few Hundred of kHz). Typically it is used for the audio frequencies.
In RC Phase Shift Oscillator, the transistor or op-amp in inverting mode is used for the amplification. So, it provides the 180 degrees of phase shift. And the remaining 180 degrees of phase shift is provided by the RC feedback network.
By tuning the gain of the RC network and the amplifier it is possible to achieve the unity loop gain.
In the feedback loop, more than two RC stages are cascaded to achieve the stable phase shift.
If three stages are used for then the attenuation provided by the feedback circuit β= 1/29.
And the frequency of the oscillation f = 1/(2πRC√6)
In general of N stages of the RC circuit are cascaded then
f =1/(2πRC√2N)
In the RC phase shift oscillator, usually the R is kept fixed and C is changed to tune the oscillator. And for proper tuning, all capacitors are ganged together.
This video will be helpful to all the students of science and engineering in understanding the RC Phase Shift Oscillator.
#RCPhaseShiftOscillator
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19 авг 2018
