776 Words4 Pages

Project on RC phase shift
Oscillator
By keisler Louis garille
HND ELECTRONIC
Contents Project on RC phase shift 2 Oscillator 2 Introduction 3 Phase Angle 5 Op-amp implementation 6 New model 9 Reproduction on a breadboard 12 Uses of phase shit oscillator 14 Quotation 14 Conclusion 14
Introduction
A phase-shift oscillator is a simple electronic oscillator. It contains an inverting amplifier, and a feedback filter which 'shifts' the phase of the amplifier output by 180 degrees at a specific 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. RC Phase-Shift Network |
The circuit on the left shows a single resistor-capacitor network and whose output voltage "leads" the input voltage by some angle less than 90o. An ideal RC circuit would produce a phase shift of exactly 90o. The amount of actual phase shift in the circuit depends upon the values of the resistor and the capacitor, and the chosen frequency of oscillations .
Phase Angle
In our simple example above, the values of R and C have been chosen so that at the required frequency the output voltage leads the input voltage by an angle of about 60o. Then the phase angle between each successive RC section increases by another 60o giving a phase difference between the input and

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