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Spiral Inductor

Spiral Inductor

Netlist Form

A spiral inductor instance has the following netlist syntax:

Axxx n1 n2 N=val W=val S=val R=val [T=val] [RB=val] [GND=val]
[COE=val] COMPONENT=ms_spiral_inductor SUBSTRATE=substrate_name

n1 and n2 are the names of the nodes connected to the inductor. The entry COMPONENT=ms_spiral_inductor identifies the element as a spiral inductor.

The entry SUBSTRATE=substrate_name identifies the microstrip substrate model name selected for the design (see Selecting a Microstrip Substrate). See the Microstrip (MS) Substrate for information on this substrate type.

**Spiral Inductor Instance Parameters**
Parameter	Description	Units	Default
COE	Coefficient of contribution from crossovers	None	1.0
GND	1 specifies the existence of a ground plane beneath the inductor 0 specifies no ground plane	None	1
N	Number of turns. Fractional turns are calculated based on the number of full turns	None	3
R	Inside radius of innermost turn	Meter	1e-3
RB	Bulk resistivity	mOhm-cm	Defaults to substrate metallization
S	Spacing between conductors	Meter	1e-3
T	Conductor thickness	Meter	Defaults to substrate metallization
W	Conductor width	Meter	1e-3

Netlist Example

A23 Port1 Port2 N=3 W=5e-4 S=5e-4 R=1e-3 T=0.0
+ RB=0.0 COE=1 GND=0
+ COMPONENT=ms_spiral_inductor SUBSTRATE=FR4

where FR4, the selected layout technology or substrate type, has a definition such as:

.SUB FR4 MS( H=7.6200e-004 Er=4.4 TAND=0.02 TANM=0
+ MSat=0 MRem=0 HU=0.00508 MET1=1.72413793103448
+ T1=1.7145e-005 RGH=0mil)

Notes

1. [All substrates] The innermost turn radius, R, must be greater than the line width, W.

2. [All substrates] This model is not recommended for use beyond the first resonant point.

3. [All substrates] The inductor model is a partial representation of a physical inductor. Air bridges are required to connect the interior end of the inductor to the rest of the circuit. The air bridges must be modeled separately. See MS Air Bridge.

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