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Compare single-edge, dual-edge controller designs in CPUs

Posted: 10 Oct 2008     Print Version  Bookmark and Share

Keywords:CPU Core power control  Core power system  CPU  current levels 

The evolution of motherboard power systems has always been a challenging environment from both a cost and performance standpoint. This is particularly true for the CPU Core power control.

Over the last 6-8 years, the current requirements have increased from 30A to today's systems that require peak currents of 130A. In concert with the increasing current levels, the slew rates have also seen a dramatic increase. Today's systems require the Core power system to handle transitions in excess of 300V/µs and up to 2A/ns. These requirements are tough enough to tackle but added to this scenario is tighter voltage accuracy requirements for the CPU. In essence, the current levels have increased, the transitions are faster, and the voltage to the CPU must be immune to these changes. The final requirement is arguably the hardest to achieve – the system cost must be cheaper than the previous generation. The competitiveness of the computing market segment is no secret and the demands are unwavering and relentless.

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