What inspections are needed after PCB design?

In the manufacturing industry, after the process designer has designed the PCB, does it need to check the design results? The answer is yes, and there is more than one way to check.

The first is DRC inspection. DRC inspection is also called design rule inspection, which is used in PCB design software (EDA) for real-time inspection and discovery of designs that are inconsistent with predetermined design specifications during the PCB Layout process. It is used to ensure the correctness of the design and meet the conventional design specifications as the starting point, and it is an indispensable part of the PCB design. Based on the role and purpose of DRC, its inspection items generally do not exceed 100 inspection items.

The second type is DFM inspection. DFM inspection is also called design analysis for manufacturability, which is based on PCB design data through real three-dimensional component models and actual manufacturing process simulation, PCB and PCBA are comprehensively reviewed for manufacturability before manufacturing, and design defects are found in the first time Insufficiency, process difficulties, manufacturing risks, design and process mismatch factors, etc., to ensure that the design and process capabilities are fully matched, which substantially reduces the number of product trials, saves production costs, and improves product reliability.

These two inspection methods are designed to be different inspections at different stages, and one is indispensable. DRC is PCB design software used to ensure that it does not violate the specifications (constraints) of its own design. Meeting DRC inspection is the most basic requirement of PCB design. Meeting DRC does not mean that it must meet the manufacturability requirements. DFM is a bridge between PCB design and manufacturing process. It belongs to the category of process design. Through it, you can find mismatching factors between design and manufacturing process, evaluate manufacturing difficulty, manufacturing risk, etc. These are all DRC in PCB design software. Covered.

There is no conflict between DFM itself and DRC inspection. The two solutions solve different problems, at different stages, and have different ultimate goals. Therefore, the difference is also very obvious.

1. The difference between DRC and DFM:

2. The difference between metaware library:

EDA component library = pad package library

Pad package created by referring to the component data sheet

DFM component library = three-dimensional physical model

The physical model of the component created by referring to the component data sheet

DFM: PCB + component model + process = assembly simulation

DFM associates the component model library to the location of each component pad through the manufacturer's part number (or specification model, or corporate material code) in the BOM.

DFM: Real 3D simulation assembly simulation analysis

DFM: Comprehensive analysis rules