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# Coplanar Coupled Lines C_2COUP . . . C_10COUP

### Symbol :

### Illustration :

### Parameters :

> L = Length of coupled lines (stretchable)
> C_NL_TYP = ID of applied coplanar coupled lines at ports
> 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/Equations/References :

> 1. A zero or negative value for L can be meaningful during the simulation. In such cases, the automatic 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 foundry. In case of DEFAULT foundry, L should be greater than or equal to max(|cond_os|, |cond2_os|).
> 2. C_NL_TYP is the ID of the data item in which the geometrical dimensions of the coupled lines are defined. See descriptions in C_NL_TYP for more information.
> 3. If L1 in selected C_GRID is not set to –1 or –2 (auto sizing), the minimum value for L1 depends on the nmber of coupled lines and has to be:
>    L1min=W1+W2+ ...+2*(S1_2 + S2_3 + ...)+SG1+SG2+2*GW

### Equivalent Circuit :

> See Figure 6-1 and related descriptions at the beginning of this chapter.

### Layout :

> 1. Center lines and ground planes can have different metal level identification.
> 2. The layout of coupled lines is stretchable. Use menu point (Edit - Trace/Transmission Line Stretch Transmission Line) in layout window in order to stretch the lines.

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