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CAD techniques for PCB design tutorial

Modules

1. The PCB Layout design flow
2. Starting a PCB project
3. The Layout design environment
4. Setting up the virtual board
5. Creating and editing obstacles
6. Working with footprints and components
7. CAD procedures for placing and routing

pages: previous | 1 2 [3] 4 5 6 | next

Obstacle Name

The name of the obstacle. It is assigned a number until you assign it a name.

Obstacle Type

The type of the obstacle, as described below.

Anti-copper. A copper-free area within a copper pour zone.

Board outline. A line that defines the board edge for routing and placement. There can be only one board outline per board, and it must be on all layers (Global layer).

Comp group keepin. An area you define to contain all components of a certain group.

Comp group keepout. An area you define to exclude all components of a certain group.

Comp height keepin. An area you define to contain all components of a certain height or greater.

Comp height keepout. An area you define to exclude allcomponents of a certain height or greater.

Copper area. A copper-filled zone on the board that can be used for noise suppression, to draw heat away from components that tend to get hot, or as a routing barrier. It can be assigned to a net or attached to a component pin. It doesn’t affect placement. It can be filled with hatched lines or it can be solid.

Copper pour. A copper-filled zone on the board that features automatic voiding where there are tracks or pads.Tracks can pass through it. Copper pour can be used for noise suppression, shielding, to draw heat away from components that tend to get hot, or to isolate signals. It can

be assigned to a net or attached to a component pin. It doesn’t affect placement. It can be filled with hatched lines or it can be solid. It repours when you choose the refresh all toolbar button.

Detail. A line not used in placing or routing used for silkscreens, drill information, and assembly drawings,

which can be attached to footprints.

Free track. A line or track that can be assigned to a net or attached to a component pin. A free track obstacle may appear on the artwork and act as a routing barrier unless the track belongs to a net. A free track obstacle doesn’t affect placement.

Insertion outline. An insertion outline defines the size and shape of a component, to allow for the insertion machine’s head dimensions without hitting another component. It is  usually defined in the footprint library as a part of the footprint.

Place outline. A place outline defines the outline of the component, plus clearance, and is used to maintain spacing between parts. Both interactive placement and autoplacement routines need this information. A place outline can exist on the top or bottom layer for surface-mount parts, or on all layers for through-hole parts.

Route keepout. An area you define that excludes routes.

Route/via keepout. An area you define that excludes routes and vias.

Via keepout. An area you define that excludes vias.

1. The PCB Layout design flow
2. Starting a PCB project
3. The Layout design environment
4. Setting up the virtual board
5. Creating and editing obstacles
6. Working with footprints and components
7. CAD procedures for placing and routing

pages: previous | 1 2 [3] 4 5 6 | next

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