Name of the exercise:
RC Phase shift oscillator (Medium frequency Sine wave generators)
Aim: To simulate RC Phase shift oscillator (Medium frequency Sine wave generators)
Material required:
1. MULTISIM Software Loaded PC 1 No.
2. Printer 1 No.
Procedure:
1. Theory
2. Design Circuit
3. Simulation Procedure
4. Output Waveform
THEORY:
A phase-shift oscillator is a linear electronic oscillator circuit that produces a sine wave output. It consists of an inverting amplifier element such as a transistor or op amp with its output fed back to its input through a phase-shift network consisting of resistors and capacitors in a ladder network.
DESIGN CIRCUIT:
Simulation Procedure:
• Open MULTISIM Software.
• Click=> New => Design1
• Click save as in Desk Top rename the Design1 to your circuit name.
Go to Component tool bar and select the components.
• Draw the circuit diagram of RC Phase shift oscillator.
• Connect the CRO above mentioned circuit.
• Click simulate button or press F5 key => RUN
• Note down the Time period and calculate the frequencies.
• Record the output waveforms.
Result:
The RC Phase shift oscillator is designed and its output is verified using MULTISIM software, measured Sine waveforms.
Questions with answers:
1. What is a phase shift oscillator?
Ans. Phase shift oscillator is a sine wave generator that uses a resistive-capacitive(RC) network as its frequency determining device.
2. What is the gain of RC phase shift oscillator?
Ans: The gain of RC phase shift oscillator is unity.
3. Give the formula for frequency of oscillations for RC phase shift oscillator?
Ans: 
4. Why there is only 60 degree phase shift in RC phase shift oscillator?
Ans. In order for an oscillator to be stable, its total phase shift must be 180 degrees. The most common design of an RC phase shift oscillator consists of three identical RC stages in series, which means that each stage contributes 60 degrees of phase shift.
Video Tutorial:
All experiments should be designed and verified through simulation tools like Multisim.
1. Zener diode (Forward and Reverse bias characteristics)
2. Rectifier circuits ( Half wave, Full wave, Bridge rectifier with filters)
3. Power supply with Zener diode as Regulator
4. Common Base transistor output characteristics
5. Common emitter amplifier (Implementation of Current Series negative feedback)
6. Emitter follower (Implementation of Voltage Series negative feedback)
7. RC Coupled amplifier (Implementation of the concept of multistage amplifier)
8. Clippers and Clampers
9. RC Phase shift oscillator (Medium frequency Sine wave generators)
10. Hartley oscillator (High frequency Sine wave generator)
11. Astable Multivibrator (Square or Rectangular wave generator)
12. Gate triggering of SCR with various gate currents.
