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Voltage Source, Sinusoidal

Voltage Source, Sinusoidal

Sinusoidal Voltage Source Netlist Form

The format for a damped sinusoidal voltage source is:

Vxxxx n+ n- [DC=val] SIN ( vo va [freq [td [alpha [theta]]]] )
[AC acmag acphase] [TONE=tone_val]
[NOISEVEC=[f1,psd1, ... fn,psdn]]

n+ and n- are the positive and negative nodes. The parameters after the SIN keyword must be enclosed in parentheses. These six parameters are positional, and must be entered in the order given. To guarantee that a given parameter is interpreted correctly, all parameters to the left of it must be present.

**Sinusoidal Voltage Source Parameters**
Parameter	Description	Unit	Default
DC	DC voltage	Volt	0.0
vo	Voltage offset from zero volts	Volt	0.0
va	Voltage amplitude	Volt	0.0
freq	Frequency	Hertz	1.0
td	Delay to start of sine wave	Second	0.0
alpha	Damping factor	Second^-1	0.0
theta	Phase delay	Degree	0.0
acmag	Magnitude for AC analysis	Volt	1.0
acphase	Phase for AC analysis	Degree	0.0
TONE	Frequency to use for harmonic balance analysis, should be a submultiple of or equal to the driving frequency and should also be included in the HB solution setup	Hertz	0.0
NOISEVEC	List of shot noise frequencies (f1...fn) and corresponding noise power spectral densities (psd1...psdn), in pairs. The sequence of frequencies must be monotonically non-decreasing.	Hertz, Volt²/Hertz	None

Sinusoidal Voltage Source Netlist Example

V23 15 21 DC=3 SIN (0 1 100e+3 1e-12 1e-4 20)

Notes

1. The AC parameter specifies the AC magnitude and phase to be applied during a small-signal AC analysis. The default for acmag is 1 Volt, the default for acphase is 0 degrees.

2. The vo parameter overrides the DC parameter in all analyses except DC analysis.

3. The diagrams below show sinusoidal outputs with time delay, phase delay, and damping.

4. For harmonic balance (HB) analysis, the test tones must be submultiples or equal to the frequencies of the actual voltage or current inputs to the circuit. To ensure that the desired HB frequency is used with a SIN, PWL, or PULSE source, qualify the source by adding a TONE=tone_val parameter at the end of the instance statement. The tone_val is then used in a subsequent HB statement.

5. The TONE parameter is needed with a SIN voltage or current source only when the driving frequency of the source differs from the frequency at which the harmonic balance is to run. For example, to analyze a circuit driven by a single 1-KHz AC voltage source using harmonic balance at a test tone of 1 KHz over the first 31 harmonics, the netlist would be simply:

V1 1 0 SIN(0 5.0 1000 0 0)

.HB TONES=1000 MAXK=31

However, to specify a 1000-Hz tone for harmonic balance while driving the circuit with a 2000-Hz sinusoidal voltage, the voltage source statement should include the TONE specification:

V1 1 0 SIN(0 5.0 2000 0 0) TONE=1000

.HB TONES=1000 MAXK=31

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