next up previous contents index
Next: Sinusoidal Up: Tran Functions Previous: Single-Frequency FM   Contents   Index


Amplitude Modulation

General Form:
am(sa oc fm fc td)
Example:
vin 12 0 am(10 1 10meg 100meg 10n)

parameter description default value units
sa signal amplitude   volts or amps
oc offset constant    
fm modulation frequency 1/tstop hz
rc carrier frequency 0.0 hz
td signal delay 0.0 seconds

The shape of the waveform is described by the following table:

time value
0 to td 0
td to tstop sa . {oc + sin(2$ \pi$ . fm . (time - td ))} . sin(2$ \pi$ . fc . (time - td ))

This function applies only to transient analysis, where time is the running variable. When referring to default values, tstep is the printing increment and tstop is the final time in transient analysis</a>. This function is a work-alike to the similar function found in HSPICE.


next up previous contents index
Next: Sinusoidal Up: Tran Functions Previous: Single-Frequency FM   Contents   Index
Stephen R. Whiteley 2017-03-28