palmeiras
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Any tuned circuit is going to have some losses.Warpspeed,
(i) please, could you clarify? it is not clear how the LC ratio will defines the loaded Q? Capacitor implemented as MiM cap or Inductor, which of these have the worse Q? I guess is the inductor.
But I do not understand why decreasing L will improve the LC-tank Q.
oscillation frequency is given by 1/√LC:
why have you chose the capacitor impedance to be 100 ohm?
Big Boss,
Please, could you clarify?
why smallest L leads to lowest noise?
(i ) I guess that Increasing L (inductor length or the number of turns) will increase RS (inductor series resistance), but I guess the ratio L/Rs tends to be the same. Is that correct?
(ii) which oscillator conditions are you talking about? And why decreasing L will have impact on it? As soon my negative resistance (RP) compensate the positive (RP) of the tank (equivalent resistance is infinite), the oscillation is guaranteed.
Negative resistance is not a single parameter on the functionality of the oscillator.The oscillator needs to satisfy necessary and sufficient conditions for stable oscillations.The huge negative resistance may not guarantee you that your oscillator will always work stable.
Negative resistance is necessary but not sufficient.In the closed loop, the desired phase shift should be occured and the loop gain must be greater than unity.These are desired conditions, not negative resistance only..
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