Hello All
I am studying about Clapp LC oscillator. Given below link is the circuit of interests
May I know how do we calculate by hand if this circuit gonna oscillate or not?
I learnt in lecture that I must find Av multiply by beta(feedback factor). Av is always given by gm multiply by R efficient , which is gmReff Reff is the sum of series and parallel resistances of all emitter resistance, ac emitter resistance , load resistance and also reflected resistances from the tap of capacitors. Emitter is mentioned here because I learnt about bipolar transistor configuration.
For the circuit in the link given, I do not understand why the same approach is use? Why we can use gmReff as the Av since it is a common drain configuration? Is it because we have already sum all the net resistances in Reff , therefore we can use gmReff as the Av?
So for other type of configuration of mosfet such as common gate and common source? We can use the same Av=gmReff ? If possible show me the correct way of checking if the circuit can oscillate by manual calculation..at least the steps or methodology. Really appreciate your help in advance.
Kindly enlighthen
rgds and thanks Jason