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Current Source, Sinusoidal

Current Source, Sinusoidal

Sinusoidal Current Source Netlist Format

The format for a damped sinusoidal current source is:

Ixxxx n+ n- [DC=val] SIN ( vo va [freq [td [alpha [theta]]]] )
[M=val] [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. 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 Current Source Parameters**
Parameter	Description	Unit	Default
acmag	Magnitude for AC analysis	Amp	1.0
acphase	Phase for AC analysis	Degree	0.0
DC	DC current	Amp	0.0
vo	Current offset from zero Amps	Amp	0.0
va	Peak current amplitude	Amp	0.0
freq	Frequency	Hz	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
M	Multiplier for simulating multiple parallel current sources	None	1.0
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
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

Sinusoidal Current Source Netlist Example

I23 15 21 SIN (0 1 100e+3 1e-12 1e-2 20)

Notes

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

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

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

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 entry at the end of the instance statement. The tone_val is then used in a subsequent HB statement.

5. The TONE keyword 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 sinusoidal current source using harmonic balance at a test tone of 1 KHz over the first 31 harmonics, the netlist would be simply:

I1 1 0 SIN(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 current, the voltage source statement should include the TONE specification:

I1 1 0 SIN(0 2000 0 0) TONE=1000

.HB TONES=1000 MAXK=31

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