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Thin Film Resistor

Netlist Format

An instance of a grounded coplanar waveguide thin film resistor has the following netlist syntax:

AGCPWTFRxxx n1 n2 W=val G=val P=val RB=val T=val COMPONENT=gcpw_thinfilm_rb SUBSTRATE=substrate_name

n1 and n2 are is the names of the nodes attached to the resistor. The entry COMPONENT=gcpw_thinfilm_rb identifies the element.

The SUBSTRATE=substrate_name is the grounded coplanar waveguide substrate model name selected for the design (see Selecting a Grounded Coplanar Waveguide Substrate for details).

**Grounded Coplanar Waveguide Thin-Film Resistor Instance Parameters**
Parameter	Description	Units	Default
W	Width of center conductor	Meter	1.0e-3
G	Slot gap width	Meter	1.0e-3
P	Physical length	Meter	1.0e-3
RB	Bulk resistivity	mohm-cm	300
T	Thickness of thin-film resistor	Meter	1e-3

AGCPWTFR5 net1 net5 W=0.75e-3 G=1.1e-3 P=2.5e-3 T=1.75e-4
+ COMPONENT=gcpw_thinfilm_rb SUBSTRATE=GCPW1

where GCPW1, the selected layout technology or substrate type, has a definition such as:

.SUB GCPW1 GCPW(
+ H=0.001524 Er=4.4 TAND=0.02 HU=2.54E-4
+ MET1=1.724137931034483 T1=2.54e-5 RGH=0)

1. A lossy transmission line is used to model the TFR section. Distributed effects are thus taken into consideration.

2. The user needs to define the GCPW steps, if any. They are not included in the TFR model.


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