Rc Phase Shift Oscillator Using Transistor 2q351z
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Measurement and Instrumentation Lab Trainers RC Phase shift oscillator ETK-1160
RC PHASE SHIFT OSCILLATOR AIM To design and test for the performance of RC Phase Shift Oscillator using transistor and then to calculate the output frequency. APPARATUS REQUIRED RC Phase shift oscillator trainer, CRO, Patch cords.
CIRCUIT DIAGRAM
THEORY A phase-shift oscillator is a simple sine wave electronic oscillator. It contains an inverting amplifier, and a filter which 'shifts' the phase of the amplifier output by 180 degrees at the oscillation frequency. The filter produces a phase shift that increases with frequency. It must have a maximum phase shift of considerably greater than 180° at high frequencies, so that the phase shift at the desired oscillation frequency is 180°. The most common way of achieving this kind of filter is using three identical cascaded resistor-capacitor filters, which together produce a phase shift of zero at low frequencies, and 270 degrees at high frequencies. At the oscillation frequency each filter produces a phase shift of 60 degrees and the whole filter circuit produces a phase shift of 180 degrees. One of the simplest implementations for this type of oscillator uses a transistor amplifier, three capacitors and three resistors, as shown in the diagram. The mathematics for calculating the oscillation frequency and oscillation criterion for this circuit are surprisingly complex, due to each R-C stage loading the previous ones.
www.enixs.in
[email protected]
Measurement and Instrumentation Lab Trainers RC Phase shift oscillator ETK-1160
The calculations are greatly simplified by setting all the resistors (except the negative resistor) and all the capacitors to the same values.
Formula In the diagram, if R1 = R2 = R3 = R, and C1 = C2 = C3 = C, then:
PROCEDURE: 1. Connect the circuit as per the wiring diagram. 2. Switch on the power supply and observe the output on the CRO (sine wave). 3. Note down the practical frequency and compare with its theoretical frequency.
www.enixs.in
[email protected]
Measurement and Instrumentation Lab Trainers RC Phase shift oscillator ETK-1160
TABULATION: Amplitude
Time period
Theoretical frequency(Hz)
Practical frequency(Hz)
RESULT: Thus the phase shift oscillator is designed and the output frequency was measured.
www.enixs.in
[email protected]
RC PHASE SHIFT OSCILLATOR AIM To design and test for the performance of RC Phase Shift Oscillator using transistor and then to calculate the output frequency. APPARATUS REQUIRED RC Phase shift oscillator trainer, CRO, Patch cords.
CIRCUIT DIAGRAM
THEORY A phase-shift oscillator is a simple sine wave electronic oscillator. It contains an inverting amplifier, and a filter which 'shifts' the phase of the amplifier output by 180 degrees at the oscillation frequency. The filter produces a phase shift that increases with frequency. It must have a maximum phase shift of considerably greater than 180° at high frequencies, so that the phase shift at the desired oscillation frequency is 180°. The most common way of achieving this kind of filter is using three identical cascaded resistor-capacitor filters, which together produce a phase shift of zero at low frequencies, and 270 degrees at high frequencies. At the oscillation frequency each filter produces a phase shift of 60 degrees and the whole filter circuit produces a phase shift of 180 degrees. One of the simplest implementations for this type of oscillator uses a transistor amplifier, three capacitors and three resistors, as shown in the diagram. The mathematics for calculating the oscillation frequency and oscillation criterion for this circuit are surprisingly complex, due to each R-C stage loading the previous ones.
www.enixs.in
[email protected]
Measurement and Instrumentation Lab Trainers RC Phase shift oscillator ETK-1160
The calculations are greatly simplified by setting all the resistors (except the negative resistor) and all the capacitors to the same values.
Formula In the diagram, if R1 = R2 = R3 = R, and C1 = C2 = C3 = C, then:
PROCEDURE: 1. Connect the circuit as per the wiring diagram. 2. Switch on the power supply and observe the output on the CRO (sine wave). 3. Note down the practical frequency and compare with its theoretical frequency.
www.enixs.in
[email protected]
Measurement and Instrumentation Lab Trainers RC Phase shift oscillator ETK-1160
TABULATION: Amplitude
Time period
Theoretical frequency(Hz)
Practical frequency(Hz)
RESULT: Thus the phase shift oscillator is designed and the output frequency was measured.
www.enixs.in
[email protected]
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