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Port Power Source, Sinusoidal (Netlist Only)

Port Power Source, Sinusoidal (Netlist Only)

Sinusoidal Port Power Source Netlist Format

A port power source is defined in a schematic design by modifying the definition of an interface port; see Nexxim Port Power Source for details. Nexxim port power sources are always sinusoidal. In a netlist design, use the syntax in this topic to create the equivalent port. The format for a port power source is similar to that of a sinusoidal voltage source:

Vxxxx n+ 0 POWER SIN ( vo va [freq [td [alpha [theta]]]] )
[AC acmag acphase] PORTNUM=val [RZ=val IZ=val] [TONE=tone_val]

n+ is the positive node to which the port source is attached. The negative node is always ground (node 0). 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 Port Power Source Parameters**
Parameter	Description	Unit	Default
vo	Voltage offset from zero volts	Volt	0.0
p	Available power of the source	Watt	1e-3
freq	Frequency	Hertz	1.0e9
td	Delay to start of sine wave	Second	0.0
alpha	Damping factor	1/Second	0.0
theta	Phase delay	Degree	0.0
acmag	Magnitude for AC analysis	Volt	1.0
acphase	Phase for AC analysis	Degree	0.0
PORTNUM	Port number (must be nonnegative integer)	None	Required
RZ	Real part of port impedance	Ohm	50.0
IZ	Imaginary part of port impedance	Ohm	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

Sinusoidal Port Power Source Netlist Example

Vtest 1 0 POWER SIN(0.0005 0.001 1000000 1e-009 0.01
+ '0.785*57.2957795') tone=1000000 portnum=1 rz=50 iz=0

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

3. 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 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.

4. The TONE parameter is needed with a SIN 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 source using harmonic balance at a test tone of 1 KHz over the first 31 harmonics, the netlist would be simply:

V1 1 0 POWER SIN(0 5.0 1000 0 0) PORTNUM=1

.HB TONES=1000 MAXK=31

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

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

.HB TONES=1000 MAXK=31

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