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Air Coil With Offset Axial Leads: AIRCOIL2

Symbol

Summary

AIRCOIL2 models an air core coil inductor with offset axial leads. Coil and lead dimensions are configurable.

This element is for use in 3D EM documents only. See “Using 3D EM Elements ” for details on using 3D pCells with Cadence® AWR® Analyst™ 3D FEM EM analysis software.

Topology

See “Air Coil With Centered Axial Leads: AIRCOIL1” for similar topology details.

Parameters

Name Description Unit Type Default
ID Subcircuit ID Text S1
NET Subcircuit name Text "AIRCOIL2"
*M Multiplicity factor - not used for this model   1
NTurns Number of turns   4
WireDia Diameter of the wire Length 1 mm
CoilDia Coil inner diameter Length 3.5 mm
Pitch Distance between turns, measured from wire center-to-center Length 1.01 mm
LeadLen Length of lead Length 1.5 mm
LeadOff Offset distance between coil body and beginning of lead Length 1.5 mm
LeadType Type of lead contact: 0=round post, 1=bottom flat tab, 2=lofted flat tab   0
TabLenRatio Ratio of tab length to total lead length for LeadType=1 or 2. 0<TabLenRatio<1   0.75
Rho Bulk resistivity of conductor metal normalized to gold   1

* indicates a secondary parameter

Parameter Details

Parameters for this model are unitless. Parameters do not scale when changing Global Units.

The lead geometry is configurable. The simplest lead, LeadType=0, is a round post. Next, LeadType=1 is a lead with a bottom flat tab. The length of the flat bottom section is (LeadLen·TabLenRatio), and the length of the round section is (LeadLen·(1-TabLenRatio)). Lastly, LeadType=2 is a lead with flat bottom that gradually transitions to a round cross-section. The length of the flat bottom section is (LeadLen·TabLenRatio), and the length of the lofted (transition) section is (LeadLen·(1-TabLenRatio)).

LeadOff. LeadOff is the offset distance between the coil body and lead. The cross-section of this region is always round. This length typically represents the length of the gap between body of the coil, and the end of the trace that the coil is attached to.

Rho. Rho is the bulk resistivity of conductor metal normalized to gold, where Rho_Gold=2.44 x 10-8 Ω*m. So actual bulk resistivity of conductor metal is (Rho·2.44 x 10-8) Ω*m.

Layout

The 2D projection of this element in the x/y plane displays in EM Layout View.

3D EM Layout

This element has a layout cell specifically for Analyst 3D EM layouts. See “Using 3D EM Elements ” for details on using 3D pCells with Analyst.

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