Thanks for the reply...
For Duty cycle of 50%:
When switch is open, no current flow, Ioff =0
When switch is closed, Ion = 1V/1KOhms = 1mA
But average: Iavg= (Ion + Ioff )/2 = 0.5mA
So Zin = Vinj/Iavg results in 2K Ohms.
I tried changing the Duty cycle to 25% and I see Zin = 4K Ohms
Please correct me if i have understood it wrong...
I have one more query :
Previously I am doing fixed LO frequency(Flo=Frf = 500K) and corresponding Beat frequency(500K) to get impedance at Fundamental LO frequencies (image: Result plot )
But I want to simulate the input impedance for Flo= Frf (Direct Down conversion) in the range of few KHz to few MHz. Can any one suggest me how to setup the PSS analysis for LO sweep and Beat frequency for the same.I need Impedance in Y axis and LO Freq sweep in x-axis.
Thanks in advance