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Current Source, Pulsed

Current Source, Pulsed

Pulsed Current Source Netlist Format

The format for a trapezoidal pulsed current source is:

Ixxxx n+ n- PULSE ( v1 v2 td tr tf pw per )
[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 PULSE keyword must be enclosed in parentheses. Note that all parameters are required to be present in the order given.

**Pulsed Current Source Parameters**
Parameter	Description	Unit	Default
acmag	Magnitude for AC analysis	Amp	1.0
acphase	Phase for AC analysis	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
v1	Initial current value	Amp	0.0
v2	Pulsed current value	Amp	0.0
td	(Positive) delay time to start of upramp	Second	0.0
tr	Risetime from V1 to V2	Second	0.0
tf	Falltime from V2 to V1	Second	0.0
pw	Pulse width (V2 hold time)	Second	1.0e100
per	Period of repetition for trapezoidal pulse	Second	1.5e100
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

The PULSE current source repeats the current waveform each period until the STOPTIME of the transient analysis is reached (see diagram below):

Note

If pw is negative, per and pw are both set to infinity.

If per is less than (tf+tr+pw), per is set to (tf+tr+pw).

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.

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.

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 AC 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

The TONE entry is required with any PWL or PULSE source. For example, to analyze a mixer driven by sources at 1 MHz and 27 kHz over the first four harmonics of a PWL source and the first two harmonics of a PULSE source, the netlist syntax would be:

I23 20 0 PWL(0 0 0.1e-6 2.0 0.5e-6 5.0 1.0e-6 0 R) TONE=1.0e6

I1 1 0 PULSE (0 5 0 5e-3 5e-3 27e-3 27.0e3) TONE=27.0e3

.HB TONES=(1.0e+6, 27.0e+3) MAXK=(4, 2)

Pulsed Current Source Netlist Example

I23 23 53 PULSE (0 .05 10ns 5ns 5ns 20ns 40ns)

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