calculation of input impedance in ADS

[Taherinia]

Hi

I want to calculate impedance in ADS with s parameter simulation in a special frequency but this simulation show input impedance vs different frequency. my circuit is designed with transistors and lumped elements .

how can calculate impedance in ADS in a special frequency?

 

[RealAEL]

ADS will always calculate results including s-parameters or Zin at each frequency defined for the sweep plan in the simulation controls. If you want to calculate such data at a different point that is not in the current frequency sweep then you can add the additional single frequency point if required. Instead of using the frequency sweep in the s-parameter simulation controller itself instead point it to a Sweep Plan element that you place separately in the schematic. Then you can define your regular sweep plan values as a linear or log sweep as normal but then you can also add a single point at your 'special' frequency. The simulation will then calculate values at all points listed in the sxwept plan and the single point.

 

[Taherinia]

thanks
voltage source is changed its value in defined frequency so bias is changed and impedance change i want to plot impedance vs voltage in defined frequency?