Phase Shift Oscillator: Why, What & How

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Discussion Overview

The discussion centers on the concept of the phase shift oscillator, specifically focusing on the reasons behind its naming, the nature of phase shifts, and the factors influencing amplitude and frequency in R-C oscillators. The scope includes theoretical understanding and conceptual clarification.

Discussion Character

  • Exploratory, Conceptual clarification

Main Points Raised

  • Some participants inquire about the definition and characteristics of an R-C oscillator, questioning what components are necessary for it to function as an oscillator.
  • There is a request for clarification on the term "phase shift," with one participant defining it as a 180-degree inverse shift of the output signal compared to the input signal.
  • One participant suggests that the discussion may relate to sinewave oscillators, prompting further exploration of this type.
  • Another participant expresses a desire to understand the topic better, indicating shared interest in the phase shift oscillator concept.

Areas of Agreement / Disagreement

The discussion does not present a consensus, as participants are seeking clarification and further details rather than agreeing on specific points.

Contextual Notes

Participants have not fully defined the necessary components of an R-C oscillator or the specific mechanisms by which amplitude and frequency can be altered, leaving some assumptions unaddressed.

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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