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Contents
• Definition
• Basic theory of oscillation
• Concept of positive feedback
• Barkhausen Criterion
• Condition for oscillation
• Conclusion and References
Prepared By S ARUN M.Tech Oscillator
1
OSCILLATORS
2
Definition:
• An oscillator is an amplifier, which uses a positive feedback and
without any external input signal, generates an output waveform at a
desired frequency.
Prepared By S ARUN M.Tech Oscillator
3
Basic Theory of Oscillators:
•The feedback is a property which allows to feedback
the part of the output, to the same circuit as its input.
•Such a feedback is said to be positive whenever the part
of the output that is feedback to the amplifier as its input,
is in phase with the original input signal applied to the
amplifier.
Prepared By S ARUN M.Tech Oscillator
4
Concept of Positive Feedback
Prepared By S ARUN M.Tech Oscillator
5
Barkhausen Criterian:
Block Diagram of Oscillator Circuit
Prepared By S ARUN M.Tech Oscillator
Conditions for Oscillations:
Barkhausen Criterion states that,
•The total phase shift around 180 deg.
•Product of open loop gain and its feedback is
unity
Aβ=1
6
Prepared By S ARUN M.Tech Oscillator
• Conclusion
From this presentation conclude that condition for
oscillator and some basic criterion.
• References
Thomas L.Floyd, “Electronic devices” Conventional
current version, Pearson prentice hall.
David A. Bell, “Electronic devices and circuits”, Oxford
University higher education.
Donald A Neamen, “Electronic Circuit Analysis and
Design” Tata McGraw Hill.
7
Prepared By S ARUN M.Tech Oscillator

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Oscillator

  • 1. Contents • Definition • Basic theory of oscillation • Concept of positive feedback • Barkhausen Criterion • Condition for oscillation • Conclusion and References Prepared By S ARUN M.Tech Oscillator 1 OSCILLATORS
  • 2. 2 Definition: • An oscillator is an amplifier, which uses a positive feedback and without any external input signal, generates an output waveform at a desired frequency. Prepared By S ARUN M.Tech Oscillator
  • 3. 3 Basic Theory of Oscillators: •The feedback is a property which allows to feedback the part of the output, to the same circuit as its input. •Such a feedback is said to be positive whenever the part of the output that is feedback to the amplifier as its input, is in phase with the original input signal applied to the amplifier. Prepared By S ARUN M.Tech Oscillator
  • 4. 4 Concept of Positive Feedback Prepared By S ARUN M.Tech Oscillator
  • 5. 5 Barkhausen Criterian: Block Diagram of Oscillator Circuit Prepared By S ARUN M.Tech Oscillator
  • 6. Conditions for Oscillations: Barkhausen Criterion states that, •The total phase shift around 180 deg. •Product of open loop gain and its feedback is unity Aβ=1 6 Prepared By S ARUN M.Tech Oscillator
  • 7. • Conclusion From this presentation conclude that condition for oscillator and some basic criterion. • References Thomas L.Floyd, “Electronic devices” Conventional current version, Pearson prentice hall. David A. Bell, “Electronic devices and circuits”, Oxford University higher education. Donald A Neamen, “Electronic Circuit Analysis and Design” Tata McGraw Hill. 7 Prepared By S ARUN M.Tech Oscillator