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Capacitor Device

Capacitor Device

Capacitor Device Instance Netlist Syntax

The syntax for a capacitor device instance is:

Cxxxx n1 n2 [modelname] [[C=]val] [[TC1=]val] [[TC2=]val]

[M=val] [L=val] [W=val] [DTEMP=val]

[SCALE=val] [IC=val]

n1 is the positive node and n2 is the negative node of the capacitor. The current is assumed to flow from n1 through the capacitor to n2. The modelname is the name of a .MODEL statement associated with the instance.

In the syntax above, both modelname and the capacitance value are shown as optional, but at least one of the two must be supplied. The label C= is optional, but the presence or absence of the C= label affects the interpretation of other unlabeled entries in the statement. The first unlabeled value after a modelname is taken to be the capacitance value.

Note

When the option device_cleanup=1 is in effect, a zero-valued capacitor is ignored, treating the branch as an open circuit, and a warning is issued.

The syntax above shows the labels TC1= and TC2= as optional, but this option depends on the presence or absence of the capacitance value, labeled or unlabeled.

• When the modelname is present without a capacitance value, the label TC1= or TC2= must be used.

• When both modelname and the capacitance value are present but the capacitance value does not have the C= label, the next two unlabeled values are taken to be TC1, then TC2. To specify a value for TC2, either a value for TC1 must be given as well, or the label TC2= must be used.

• When the capacitance value is present with the C= label, the labelsTC1= and TC2= are required.

All instance parameters except C and IC can also be entered as model parameters. When a parameter has both an instance value and a model value, the instance value prevails.

**Capacitor Instance Parameters**
Instance Parameter	Description	Unit	Default
C	Capacitance	Farad	Calculated from geometry or set to CAP (model parameter)
DTEMP	Difference between capacitor and circuit temperatures	Celsius	0.0
IC	Initial voltage across capacitor	Volt	None
L	Capacitor length	Meter	0.0
M	Multiplier to simulate parallel capacitors	None	1.0
SCALE	Scale factor	None	1.0
TC1	1st-order temperature coefficient	°K^-1	0.0
TC2	2nd-order temperature coefficient	°K^-2	0.0
W	Capacitor width	Meter	0.0

Capacitor Device Netlist Example

C1 3 4 C=5PF

C2 5 6 C=5PF TC1=0.01

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