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Inductor, Frequency-Dependent (Netlist Only)

Inductor, Frequency-Dependent (Netlist Only)

Notes

The frequency-dependent inductor is available for use in netlists, but is not supported in the Components window of the Designer Schematic Editor.

Frequency-Dependent Inductor Instance Netlist Syntax

Instead of the standard inductor syntax with a specified inductance value, you can define the inductance by an expression involving the frequency, using the syntax given in this section. The general form for a frequency-dependent inductor instance is:

Lxxxx n1 n2 [L=]'freq-dependent-expr'

[TC1=val] [TC2=val] [M=val] [SCALE=val]

[DTEMP=val] [TNOM=val] [TRAN_EVAL_FREQ=val]

n1 is the positive node and n2 is the negative node of the inductor. The current is assumed to flow from n1 through the inductor to n2.

**Frequency-Dependent Inductor Instance Parameters**
Instance Parameter	Description	Unit	Default
DTEMP	Inductor and circuit temperature difference	°C	0.0
DTEMP	Difference between capacitor and circuit temperatures	Celsius	0.0
L	Inductance	Henry	Calculated from the frequency-dependent expression
M	Multiplier to simulate multiple inductors in parallel	None	1.0
SCALE	Scale factor for inductance	None	1.0
TC1	Linear temperature coefficient	°K^-1	0.0
TC2	Quadratic temperature coefficient	°K^-2	0.0
TNOM	Nominal temperature	°C	25.0
TRAN_EVAL_FREQ	Frequency to use for transient analysis	Hertz	0.0

Frequency-Dependent Inductor Netlist Examples

Frequency-domain analysis

L1 1 2 L='1/sqrt(HERTZ)' dtemp=30 TC1R=0.1 TC2R=0.05
.LNA LIN 100 1e6 10e6

Time-domain analysis

L2 11 22 L='1/sqrt(HERTZ)' TRAN_EVAL_FREQ=1e8
.TRAN 0.1ns 10ns

Notes

1. The frequency-dependent inductor is supported only for frequency-domain analyses such as AC and LNA. Running a time-domain analysis such as TRAN on a circuit including a frequency-dependent inductor is an error.

2. The frequency-dependent expression should be enclosed in single quotation marks. The token HERTZ can be used in the expression to indicate the frequency as supplied by the analysis. The circuit frequency is available to the model each time the model equations are evaluated. The label L= is optional. The first unlabeled value is taken to be the inductance.

3. When the parameter TRAN_EVAL_FREQ is provided, Nexxim can run a transient (time-domain) analysis, substituting the value of TRAN_EVAL_FREQ for the variable HERTZ to produce a constant inductance value for the transient analysis.

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