1. RC Phase Shift Oscillator
Working Principle and Operation
Presented by: [Your Name]
2. Introduction
• Oscillators generate continuous, periodic
waveforms without external input.
• RC phase shift oscillator uses resistors and
capacitors to produce a phase shift.
• Commonly implemented using op-amps or
transistors.
3. Circuit Diagram
• Circuit consists of:
• - An inverting amplifier (Op-amp or transistor)
• - Three cascaded RC sections
• RC network provides required phase shift.
• Amplifier inverts the signal.
• [Insert circuit diagram here]
4. Principle of Operation
• Each RC section gives 60° phase shift.
• Three sections provide a total of 180°.
• Inverting amplifier gives an additional 180°.
• Total = 360° → satisfies Barkhausen criterion.
• Positive feedback sustains oscillations.
5. Frequency of Oscillation
• Formula: f = 1 / (2πRC√6)
• R and C are identical in each RC section.
• Frequency depends on the values of R and C.
6. Barkhausen Criterion
• Loop gain (Aβ ≥ 1)
• Total phase shift around the loop = 360° or 0°
• Ensures sustained and undamped oscillations.
7. Working Explanation
• Initial noise or disturbance starts oscillation.
• RC network shifts phase and feeds signal to
amplifier input.
• Amplifier increases signal amplitude.
• The loop repeats, maintaining a stable sine
wave output.
8. Applications
• Sine wave generators
• Audio frequency oscillators
• Signal generation in communication systems
• Testing and lab instrumentation
9. Advantages & Disadvantages
• Advantages:
• - Simple and easy to construct
• - Good frequency stability for low frequencies
• Disadvantages:
• - Not suitable for high-frequency applications
• - Requires precise gain control to maintain
oscillation
10. Conclusion
• RC Phase Shift Oscillator generates stable sine
waves.
• Utilizes RC phase shift network and inverting
amplifier.
• Ideal for low-frequency applications where
simplicity is key.
11. RC Phase Shift Oscillator Circuit
Diagram
• Below is a simplified representation of the RC
Phase Shift Oscillator using 3 RC sections and
an op-amp.
![RC Phase Shift Oscillator
Working Principle and Operation
Presented by: [Your Name]](https://image.slidesharecdn.com/rcphaseshiftoscillatorpresentationwithdiagram-250804144337-8bebb117/85/RC_Phase_Shift_Oscillator_Presentation_With_Diagram-pptx-1-320.jpg)
![Circuit Diagram
• Circuit consists of:
• - An inverting amplifier (Op-amp or transistor)
• - Three cascaded RC sections
• RC network provides required phase shift.
• Amplifier inverts the signal.
• [Insert circuit diagram here]](https://image.slidesharecdn.com/rcphaseshiftoscillatorpresentationwithdiagram-250804144337-8bebb117/85/RC_Phase_Shift_Oscillator_Presentation_With_Diagram-pptx-3-320.jpg)
