PORTMOD is a modulated carrier source. The frequency components of the modulated signal are specified by a data file on your computer. PORTMOD_F is a more advanced source that Cadence ® recommends over the PORTMOD source.
|Z||Termination impedance||Resistance||50 ohm|
|Pwr||Available power||DB Power||0 dBm|
|SIG||Modulated signal file name||Text||QPSK|
|FRes||Frequency resolution||Frequency||0.1 GHz|
|PIN_ID||Name identifier for pin||Text|
PORTMOD is a modulated carrier source. The carrier is centered at the project frequency (or nonlinear frequency); 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 SIG text file, which should be placed in the
/signals subdirectory of the Cadence AWR Design Environment® program directory. The file
specifies the frequency components of the complex envelope as follows:
The magnitude of the frequency components is expressed in dBm and is placed in the first column.
The phase of the frequency components is expressed in degrees and is placed in the second column.
The components are specified in the order of increasing frequency.
If the envelope spectrum is non-symmetric, the file should include the header DOUBLE_SIDED. If the envelope spectrum is symmetric, you can choose to specify only the right-hand side of the spectrum by including the header CONJ_SYM.
The file name extension must be
The frequency components, as specified in the signal file, are scaled so that the total power is equal to Pwr. You do not, therefore, need to be concerned with the scaling of the signal components.
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.