Meaning of an electronic circuit will oscillate?

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Discussion Overview

The discussion centers on the meaning of oscillation in electronic circuits, specifically in relation to the Barkhausen stability criterion. Participants explore the conditions under which a circuit can sustain oscillations, the nature of these oscillations, and the implications of feedback in such circuits.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants propose that an electronic circuit oscillates when it acts as an oscillator, sustaining oscillations without external signals, though it still requires power.
  • One participant questions the purpose of an oscillator if the input also has a constant frequency, seeking clarification on the role of feedback and amplification in the circuit.
  • Another participant explains that the Barkhausen criterion indicates when a circuit will oscillate independently, with the oscillation frequency determined by the circuit's properties.

Areas of Agreement / Disagreement

Participants express varying interpretations of oscillation and the implications of feedback in circuits, indicating that multiple competing views remain and the discussion is not resolved.

Contextual Notes

Participants reference the need for further elaboration on the relationship between input frequency and oscillation, as well as the role of feedback in maintaining oscillations.

amaresh92
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i wonder if anyone can tell me the meaning of "The Barkhausen stability criterion is a condition to determine when an electronic circuit will oscillate."
in this what is the meaning of an electronic circuit will oscillate?

thanks
 
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Well, that the circuit acts as an oscillator; i.e. sustains oscillations (usually sinusoidal) and without any external signal coming in (although the circuit will of course still need to be powered).
 


f95toli said:
Well, that the circuit acts as an oscillator; i.e. sustains oscillations (usually sinusoidal) and without any external signal coming in (although the circuit will of course still need to be powered).

i found that the oscillator means to maintain a constant frequency output,but my doubt is we are giving input which also has a constant frequency?then what's the use of this?
will you please elaborate your answer?
and as i read, i feel that in this circuit we are controlling the input by giving feedback to it and the amplifier still amplify the input to the same extent as before.is it true?
 


The criterion tells you when a circuit will oscillate on its own, without any external frequency. When the criteria is met it is enough to power the circuit from e.g. a battery and it will still give the same frequency out.

Moreover, the frequency of the oscillation will only depend on the properties of the circuit (i.e. component values etc).
 

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