A layout engineer who studies signal integrity simulation
usually adds teardrops for the purpose of enhancing the connection strength between the signal line and the pad and improving reliability when some devices or large pads are plugged in; the second is to maintain high speed The impedance continuity of the signal prevents the impedance mutation, etc., from causing signal integrity problems.
1. Add teardrops:
Select the Route command under the Allegro menu, click Gloss, select Add Fillet, and then click the pad to add teardrops, as shown below, you can add teardrops:
2. Remove the teardrop:
Select the Route command under the Allegro menu, click Gloss, select Delete Fillet, and then click the teardrop to be deleted, as shown below: To delete a teardrop use the
above command, use the usual Delete command is not It works. After selecting the delete teardrop command, click the pad you want to delete, and all teardrops on this device will be deleted at the same time.
3. Automatically add teardrops:
Select the Route command under the Allegro menu, click Parameters, and the following dialog box will pop up: Check
Fillet and tapered trace, and click Gloss, the software will automatically add teardrops to all the pads on the board, as follows As shown in the figure:
4. Set teardrop properties:
Click the box in front of Fillet and tapered trace, as shown in the figure below:
This contains comprehensive options, operating objects, adding objects, etc., generally keep the default:
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The above information is mainly compiled by myself in PCB design and Internet search. If there
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