ic_engr
|
Hello analog_wiz,
All theoretical calculations for pierce oscillator give minium start-up time using |Rneg| which is computed at gmopt.
t=2*Lm/|Rneg|.
I believe the assumption is at gmopt, the |Rneg| is maximum so we get minimum time.
However, if the actual gm of the circuit is well above gmcritical, but BELOW gmopt, what will be the |Rneg| at the actual gm and how will the max start up time be computed.
Also I am planning to use a Feedback resistor of ~6Meg-7Meg with a bia current of 200nA.
Regard
ic_engr
|