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Improved Process to Regain Lost Voltage Plane Copper During Design Process Utilizing Removal of Unused Pads and Engineered Rules

IP.com Disclosure Number: IPCOM000246782D
Publication Date: 2016-Jun-30
Document File: 1 page(s) / 64K

Publishing Venue

The IP.com Prior Art Database

Abstract

Described is a method to regain lost voltage plane copper by removing unused pad annular rings during design process and simultaneously defining hole-to-shape rules to ensure appropriate manufacturing clearances.

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Improved Process to Regain Lost Voltage Plane Copper During Design Process Utilizing Removal of Unused Pads and Engineered Rules

Dense printed circuit board (PCB) designs loose valuable copper through via and pin fields due to manufacturing-based clearance requirements. A typical "trick" done by fabricators is to remove unused pads to additionally help their clearance margins but does nothing to address lost copper. This two step process performs the pad removal before shipping to fabricators and restores the lost copper during the design phase using rules. In order to increase voltage plane copper, perform the removal of unused pads in tandem with adjusting the hole-to-shape rules to measure from voltage planes to drilled holes instead of via pads. This is particularly obvious and critical when working in "positive" mode with planes rather than the default "negative" mode that many sites and the library are based upon. Figures 1 and 2 below show typical scenarios. Figure 3 below shows how the improved process can improve designs by adding the copper back in and still honor design rules.

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