raja.cedt
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hello may be like this, let us say i have applied current with 0 phase shirt at the gate of the transistor, it flows through Cgs of the transistor and creates voltage of 90 degree lag, then 90 degree lag current will flow through transistor (because i=gm*vgs), this current will flow through inductor which creates 0 phase shift voltage, means some resistive impedance is appearing, but this will happen only at some frequency. Another way to look at this loop gain is a kind of high pass filer and now find the input impedance.
Thanks, raj.
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