Analysing Sinusoidal Oscillator Circuits: A Different Approach
Conventionally, in analysing sinusoidal oscillator circuits, one uses the Berkhausen’s criterion, viz. Aβ = 1 in a positive feedback amplifier whose gain without feedback is A and whose feedback factor is β. However, the identification of A and β poses problems because of mutual loading of the amplifier and the feedback network. A different approach is presented here which does not require such identification. The method is based on assuming a voltage at an arbitrary node and coming back to it through the feedback loop.