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calculation of input impedance in ADS

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Taherinia

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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

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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.

SweepPlan.png
 

Taherinia

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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?
 

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