Phase Shift Oscillator: Why, What & How

AI Thread Summary
The discussion centers on the R-C oscillator, specifically why it is termed a phase shift oscillator. It is clarified that the phase shift refers to a 180-degree inversion of the output signal compared to the input signal. Participants inquire about the components necessary for an R-C oscillator to function, emphasizing that a resistor and capacitor alone do not create oscillation. The conversation also touches on how to adjust the amplitude and frequency of the oscillator. Overall, the thread seeks to deepen understanding of the R-C oscillator's mechanics and terminology.
samieee
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hi
i want to know why R-C oscillator is called phase shift oscillator? does it only shift the phase?How the amplitude and the frequency of oscillator ca be changed?
thanks
 
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samieee said:
hi
i want to know why R-C oscillator is called phase shift oscillator? does it only shift the phase?How the amplitude and the frequency of oscillator ca be changed?
thanks

Welcome to the PF. Could you please give more details about what you mean by an RC Oscillator? An RC all by itself won't make an oscillation, right? What else goes into an RC Oscillator? And what can you tell us about the definition of phase shift? What is it? Phase of what compared to what?
 
berkeman said:
Could you please give more details about what you mean by an RC Oscillator?

an oscillator having resistor and capacitor may be called an R-C oscillator.
 
berkeman said:
what can you tell us about the definition of phase shift? What is it? Phase of what compared to what?

phase shift means shifting the phase inversely by 180 degree.The phase of output signal compared to input signal.
 
Do you mean this sinewave oscillator?

Rc_phase_shift_oscillator.gif


You can read about it here:

http://en.wikipedia.org/wiki/Phase_shift_oscillator
 
I also want to know that.
 

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