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Port with Modulated Signal (Data File-based): PORTMOD_ENV



PORTMOD_ENV is a modulated carrier source for Circuit Envelope analysis. The frequency components of the modulated signal are specified by a data file under the Data Files node in the Project Browser.


Name Description Unit Type Default
P Port number   1
Z Termination impedance Resistance 50 ohm
Pwr Available power DB Power 0 dBm
NET Modulated signal data file name String  
FRes Frequency resolution Frequency  
WINDOW Window type   DEFAULT
Tone Tone number for the signal   1
Freq Tone frequency Frequency 1 GHz
PIN_ID Name identifier for pin Text  

Parameter Details

FRes. If empty, an attempt is made to determine the frequency resolution from the data file. The frequency resolution can be declared in the data file by using the FREQ tag. For example: FREQ=12500

WINDOW. Window that can be applied to the data. Options are NONE, DEFAULT, TRIANG, HANN, HAMM and BLACK.

Freq. The frequency of the tone. Can be specified if tone > 1.

Implementation Details

PORTMOD_ENV is a modulated carrier source for Circuit Envelope analysis. The RF carrier is centered at the specified tone frequency or the project frequency if tone is 1; the available signal power is given by Pwr; the port impedance is given by Z; and the frequency resolution (resolution bandwidth) of the modulation signal (the complex envelope) is given by FRes.

The modulation signal is specified in the data file referred to by the NET parameter. The file must be imported into the Cadence® AWR Design Environment® software as a text data file type. The file specifies the frequency components of the complex envelope as follows:

  • The magnitude of the frequency component is expressed in dBm and is placed in the first column

  • The phase of the frequency component is expressed in degrees and is placed in the second column

  • If the envelope spectrum is non-symmetric, the file should include the tag SPECTRUM=DOUBLE_SIDED. If the envelope spectrum is symmetric, you can choose to specify only the right-hand side of the spectrum by including the tag SPECTRUM=CONJ_SYM.

The frequency components, as specified in the data file, are scaled so that the total available power is equal to Pwr. See PORTMOD_F for an example of the data file format.

You can use the Cadence® AWR® Visual System Simulator™ (VSS) communications and radar systems design software FILE_SNK block to generate the files used by this source. If you do use this block, on the Element Options dialog box Setup tab, set Destination to Write data file to project tree, set File format to “Microwave Office Signal File”, and make sure to specify enough Duration to properly capture the signal.

The port number P is set automatically. If PIN_ID is not empty, text displays on the pin when it is instantiated as a subcircuit.


This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.

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