Connecting two planes at a single point, such as an analog ground and digital ground, is a common feature of many circuit boards to prevent IR drops over copper traces from being injected into signals. There are cases where Home-Run or start-point connections are needed. If you simply connect them they will end up being one net - and thus routed as one net. A better way is to make a special part that is nothing but copper that jumpers the two nets.
In this example AGND is connected to GND. It would be possible to create a three(or more) net pavilion.
The part is copper over-lapping two pads. The reference designator is set to invisible. Visit the main page
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