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PCB Layout CAD : DRC/MRC Settings

Teardrops

This is a function for making teardrop shapes for connecting Lands and Routes so that the corners of the connections are not acute angles when connecting to Arc shape patterns.
In the DRC, it is checked whether there is a teardrop in specified Pads or Vias.

For more details about opening the DRC/MRC Settings screen, refer to About DRC/MRC Settings.

Example) Teardrop Settings

Teardrops will not be generated for the following objects.

Case1：Customized pads
Case2：Routes with its Cap Shape set as Square
Case3：Routes wider that pad lands
Case4：Pad lands in which teardrops do not fit

Setting Method

First, in Settings, there is an "Assignment" tab and "Advanced Settings" tab.
The "Advanced Settings" tab is used for configuring actual settings, and the "Assignment" tab is used for configuring which settings are assigned to which Net.

About the Work Procedure

STEP 1: Create a Net Class from the "Net Class" tab
STEP 2: Configure settings in the "Advanced Settings" tab
STEP 3: Assign settings to the Net Class in the "Assignment" tab

The following will explain each setting tab.

Explanation of Each Setting Tab
Tab Name Content

Assignment

It is possible to assign the "Settings" that are applied to Nets set in the "Net Class".

For example, you can create a "Power Supply Net Class (GND, VCC)" Net Class, and assign the setting for "Power Supply Net Settings".
When it is not necessary to divide settings for each Net, all Nets apply to "DefaultClass",
so, assign "DefaultSetting".
* All Nets not individually assigned in the Net Class are "DefaultClass".

Advanced Settings

Configures actual settings.
Multiple definition is possible for settings.

Advanced Settings
 

For more details about adding settings, refer to Adding Settings.

Tear Drop Settings

Object Settings

Objects to which the teardrop shape applies are "Pads", "SMDs", and "Vias".

Item Content

Pad

Configures Tear Drop Settings for Dip Pads.

SMD

Configures Tear Drop Settings for CHIP Pads (Pads without Drills).

Via

Configures Tear Drop Settings for Vias.

 

Tear Drop Settings

Configure settings for whether to apply a teardrop shape for connections between each object land and route, and settings for the shape.

Item Content

Tear Drop

Enable this option to apply teardrops to pads/vias on the PCB design.

You can choose to apply a teardrop or not for each pad shape.

Circle

Enable this option to apply teardrops to circle pads.

Square

Enable this option to apply teardrops to square pads.

Oval

Enable this option to apply teardrops to oval pads.

Rectangle

Enable this option to apply teardrops to rectangle pads.

Custom

Enable this option to apply teardrops to custom pads.

Type

Specifies the Tear Drop shape.

Line 　Arc　



The distance in orange is "Route Width × Length Ratio + Radius × Diameter Ratio". * Keep in mind that the distance differs according to the Diameter Ratio.

Diameter Ratio

Use this field to specify the diameter ratio of the teardrops for pads. (Set this to 1.0 or smaller.)

[Diameter Ratio]
When the diameter ratio is set to 0, the teardrop will not be generated as its size will be 0.
The teardrop size will be determined based on the offset value: ((Pad Size - (Pad Size * Diameter Ratio)) / 2) - (Route Width / 2).
* For custom pads, the width or height of the maximum area, whichever is smaller, is used instead of the pad size.

Length Ratio

Use this field to specify the length of the teardrops for pads. The distance in light blue is the ratio for the route.

The distance in orange is calculated with the following formula: Diameter × Length Ratio + (Radius × Diameter Ratio - Route Width/2).
* Keep in mind that the distance differs according to the diameter ratio.

[Length Ratio]
When the length ratio is set to 0, the teardrop will not be generated as its size will be 0.
Teardrop Length = Pad Size * Length Ratio
* For custom pads, the width or height of the maximum area, whichever is smaller, is used instead of the pad size.

Via

Configures Tear Drop Settings for Vias.

 

Layer Settings

For more details, refer to Layer Settings.

 

Assignment Settings

 For more details, refer to Assignment Settings.