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Nexxim Simulator >
Nexxim Component Models >
Stripline Elements >
Open End Effect

Open End Effect

Netlist Form

An open end effect instance has the following netlist syntax:

Axxx n1 W=val [OPEN=POS|NEG] COMPONENT=open_end SUBSTRATE=substrate_name

n1 is the name of the node attached to the open end effect. The entry COMPONENT=TBS identifies the element as an open end effect.

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

**Open End Effect Instance Parameters**
Parameter	Description	Units	Default
W	Line width	Meter	1e-3
OPEN	POS means a positive open-end effect is applied NEG means a negative open-end effect is applied (used for de-embedding)	None	POS

Netlist Example

A12 1 2 W=.0025 COMPONENT=open_end SUBSTRATE=SL1

where SL1, the selected layout technology or substrate type, has a definition such as:

.SUB SL1 SL( B=0.001524 Er=4.40000000000000
+ TAND=0.0200000000000000 MET1=1.72413793103448
+ T1=1.7145e-005 RGH=0mil)

Notes

1. [All substrates] The transmission line is extended by a DL length, which is a function of the dielectric constant, frequency, and physical dimensions of the line. If the OPEN parameter is set to NEG, a negative effect is applied. This holds true for the length extension DL, as well as the associated dielectric losses.

2. [Stripline] For maximum accuracy (where B is the ground-to-ground distance and E_R is the dielectric constant of the substrate):
F[GHz] < 708/B[MILS]
E_R £ 50
0.01 £ W/B £ 100

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