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Voltage Source, Pulsed

Voltage Source, Pulsed

Pulsed Voltage Source Netlist Format

The format for a trapezoidal pulsed voltage source is:

Vxxxx n+ n- PULSE ( v1 v2 [td [tr [tf [pw [per]]]]] )
[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. 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.

**Pulsed Voltage Source Parameters**
Parameter	Description	Unit	Default
v1	Initial voltage value	Volt	0.0
v2	Pulsed voltage value	Volt	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	1e100
per	Period of repetition for trapezoidal pulse	Second	1.5e100
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

Pulsed Voltage Source Netlist Example

V23 23 53 PULSE (0 5 0 5ns 5ns 20ns 40ns)

Notes

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

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

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

4. 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.

5. 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.

6. 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:

V23 20 0 PWL(0 0 0.1e-6 2.0 0.5e-6 5.0 1.0e-6 0 R) TONE=1.0e6

V1 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)

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