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IQ_ModTuned (I/Q Modulator, Tuned)


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 modulator that selects the input harmonic defined by the specified Fnom frequency and modulates it according to the I (in-phase) and Q (quadrature) modulation inputs.
    If there is no analysis harmonic frequency close enough to the Fnom frequency, a warning is issued and the output is 0. All three input impedances are 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
    k represents the value at the analysis harmonic frequency closest to the Fnom value
    0 represents the baseband component of the two modulation input voltages.
  2. The RF carrier is injected at pin 1; I data is injected at pin 3; Q data is injected at pin 4. The resulting modulated signal is present at pin 2. The RF carrier should be a frequency-domain source; the modulating signals should be a time-domain source.
  3. This model will not function as a phase modulator in transient and baseband envelope simulation because of the use of the complex j operator.
  4. Both AM and PM modulation can be generated.
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