The PCB Design Magazine

PCBD-Apr2015

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30 The PCB Design Magazine • April 2015 by Barry olney iN-CiRCuiT DesiGN PTy lTD BEyoND DESIGN Learning the Curve coulmn Currently, power integrity is just entering the mainstream market phase of the technol- ogy adoption life cycle. The early market is dominated by innovators and visionaries who will pay top dollar for new technology, allow- ing complex and expensive competitive tools to thrive. However, the mainstream market waits for the technology to be proven before jumping in. Power distribution network (PDN) planning was previously overlooked during the design process, but it is now becoming an essential part of PCB design. But what about the learning curve? The mainstream market demands out- of-the-box, ready-to-use tools. The mainstream market, representing more than 65% of the total EDA software market, wants established technology at an affordable price. The majority of high-end tools require a PhD to drive. However, the mainstream market demands tools that are intuitive and can be used by any member of the development team from EEs to PCB designers to achieve quick results. Inadequate power delivery can exhibit in- termittent signal integrity issues. These include high crosstalk and excessive emission of elec- tromagnetic radiation, degrading performance and reliability of the product. The PDN must accommodate variances of current transients with as little change in power supply voltages as possible. So the goal of PDN planning is to design a stable power source for all the required power supplies. As with stackup planning, the PDN design is required before a single IC is placed on the board. Figure 1: Technology adoption life cycle (Geoffrey A. Moore's Crossing the Chasm).

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