Picor Filters Optimize EMI Performance
and Save Space for Multi-Function Edge Routers
A router is a networking device whose software and hardware are usually tailored to the tasks of routing and forwarding information. The best example of a router application is the internet where information is directed to various paths by routers. Routers are composed of a buffer for storing data packets and one or more interface cards for routing data packets and a processing engine. Edge routers provide authenticated access to faster, more efficient backbone and core networks. The trend is to make the edge device smarter and the core device(s) "dumb and fast", so edge routers often include Quality of Service (QoS) and multi-service functions to manage different types of traffic. Designers of multifunction edge routers, or any other high end communications network equipment, will often select components based on performance and/or space savings, the space savings in turn allows them to add more functionality. Picor Active filters provide both the higher performance through better noise attenuation as well as a space savings. Our customer had been designing line cards for a next generation edge router and the design was becoming space constrained. The new platform needed to free up space for more FPGAs and ASICs. One area that they felt they could recover some board space is in power system. The company already had a preferred DC-DC vendor that they wanted to maintain, so any changes they made had to be compatible with that device. The power bus was -48 V at 150 W. The customer evaluated a Picor QPI filter and found that the filter allowed them to pass EMI with sufficient margin using their preferred DC-DC converter; and more importantly for the designer, the filter was smaller than the legacy solution. The filter was designed-in and is now being considered for use in future designs.
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