C_SHORT

	C_SHORT Coplanar Short End Parameters Notes Equivalent Circuit
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Coplanar Short End

C_SHORT module represents a short circuited coplanar line. The dimensions of the line connected to the short are defined in data item addressed by C_ LTYP. L is the length of the connected coplanar line. WG is the extension of the ground plane at the end of line.

Parameters

Parameter	Description	Range of Usage
L	Length of transmission line connected to the coplanar short end.
WG	Width of the ground plane at the open end (WG=0, infinite ground plane)	n/2.DL(n=2,3,4,...)
C_TYP	ID of coplanar transmission line applied at ports 1
C_SUB	ID of coplanar substrate definition
C_GRID	ID of simulation control data
TEMP	ID of element temperature definition used for noise computation

Notes

A negative value for L can be meaningful during the simulation. In such cases, the automated layout generation works incorrectly and the generated layout has to be edited manually. The minimum value for L depends on the metal layer oversize in the currently selected C_LAYER. In case of DEFAULT foundry, L should be greater than or equal to max(|cond_os|, |cond2_os|).
For WG =0, infinite ground plane at shorted end is assumed for the simulation.
If L1 and L2 in selected C_GRID are not set to –1 or –2 (auto sizing), the minimum values for L1 and L2 are: L1_min=W+2S+2GW, L2_min=8DL+WG

Equivalent Circuit

For the modeling of the C_SHORT element, an equivalent inductance is used. The value of this inductance is derived from quasi-static FD-calculations. The connected line at the port is modeled as a C_LIN element and is represented by its characteristic impedance ZL and phase constant b. There is no limitation due to the length of connected line L.