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Nexxim Simulator >
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   Capacitor with Q Factor       

Capacitor with Q Factor

 

Capacitor with Q Factor Instance Netlist Syntax

The syntax for a capacitor with Q factor instance is:

Axxxx n1 n2 [C=val] [Q=val] [EXP=val] [F=val]
[DTEMP=val] [TC1=val] [TC2=val] [M=val] COMPONENT=capacitor_q

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 COMPONENT=capacitor_q entry identifies the component as a capacitor with Q factor.

 


Capacitor with Q Factor Instance Parameters

Instance Parameter

Description

Unit

Default

C

Capacitance

Farad

1.0e-11

DTEMP

Difference between capacitor and circuit temperatures

Celsius

0.0

EXP

Q exponent. Must be positive (>=0)

None

0.5

F

Reference frequency at which Q is specified

Hertz

1.0e9

M

Multiplier to simulate parallel capacitors

None

1.0

Q

Quality factor at reference frequency

None

300.0

TC1

1st-order temperature coefficient

°K-1

0.0

TC2

2nd-order temperature coefficient

°K-2

0.0

Capacitor with Q Factor Netlist Example

A12 3 4 C=5e-12 Q=240 F=2e9 COMPONENT=capacitor_q

 

Technical Notes

The frequency-dependent Q Factor is calculated by:

 

[spacer]

 

 

Where fref is the reference frequency given by instance parameter F, Q(fref) is the Q factor at the reference frequency given by instance parameter Q, and the exponent EXP is the instance parameter EXP. EXP=0 results in constant Q. EXP=1 results in constant resistance. Calculation of S-parameters with EXP=0 has been made analytically causal. For other values of EXP (>0), Nexxim does not guarantee causality.

 

The temperature-dependent effective capacitance is calculated by:

 

[spacer]

 

 

Where C, M, TC1, TC2, and DTEMP are the instance parameters.

 



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