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Voltage Source, Single-Frequency FM (Netlist Only)

Voltage Source, Single-Frequency FM (Netlist Only)

Single-Frequency FM Voltage Source Netlist Format

The format for a single-frequency-modulated voltage source is:

Vxxxx n+ n- SFFM ( vo va [fc [mdi [fs] ] ] )

n+ and n- are the positive and negative nodes, as for the DC voltage source. Parentheses around the parameters after the SFFM keyword are optional. The unlabeled parameters in parentheses are positional. Parameters vo and va are required. Parameters fc, mdi, and fs can be omitted, but the parameters must be entered in the order shown. To guarantee that a given parameter is interpreted correctly, all parameters to the left of it must be present.

Note

The SFFM voltage source is available for use in netlists, but is not supported in the Components window of the Designer Schematic Editor.

**SFFM Voltage Source Statement Entries**
Entry	Description	Unit	Default
vo	Output voltage offset from zero volts	Volt	Required
va	RMS output voltage amplitude	Volt	Required
fc	Carrier frequency	Hertz	1/TSTOP entry from the .TRAN statement
mdi	Modulation index	Second	0.0
fs	Source frequency	Hertz	1/TSTOP entry from the .TRAN statement

SFFM Voltage Source Netlist Example

V1 15 21 SFFM (0 1M 20K 5 1K)

Notes

6. The shape of the SFFM voltage waveform is given by the equation:

(3)output = vo + va ´ sin[(2p ´ fc ´ time) + mdi ´ sin(2p ´ fs ´ time)]

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