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AM_DemodTuned (AM Demodulator, Tuned)

Symbol

Available in ADS

Parameters

Name

Description

Units

Default

Fnom

Nominal input frequency

GHz

1

Rout

Output resistance

Ohm

50

Notes/Equations
  1. This is a tuned demodulator that selects the input harmonic closest to the specified Fnom frequency and generates a baseband output signal equal to the instantaneous amplitude of the selected carrier frequency.
    If there is no analysis harmonic frequency close enough to the Fnom frequency, a warning is issued and the output is 0. Input impedance is infinite; output impedance is set by Rout, and is limited to a minimum value of 0.1 Ohm. The open circuit output voltage is defined by

    where

    and
    k represents the value at the analysis harmonic frequency closest to the Fnom value
    0 represents the baseband component of the output voltage. All non-baseband output frequency components are 0.
  2. This model generates only the absolute value of the input because the imaginary part of baseband signals is 0 for baseband envelope simulations. It does not produce the required baseband signal in transient simulation so you have to add a filter after it to filter the unwanted signal.
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