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simply plot the group delay of the tank circuit u want , hen use the realtion
Q=Π*freq*dealy
or plot the transfer function of the tank and the Q=center frequency/bandwidth of the tank
Thanks khouly! According to your suggestion, the resulted Q is just the value under the condition that VCO cross-coupled differential pair(NMOS pair) bias only with DC value. My mean is how to simulate the Q value when the VCO oscillate. I think the Q value under the two cases is different.
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