Active EMI Input Filters for PICMG® 3.0 Compliant AdvancedTCA Applications
The AdvancedTCA (or ATCA) standard that was adopted in 2001, established new power requirements with the intent to improve system reliability. Picor develops products that align with the PICMG ® 3.0 Standards.
One example of an ATCA application that Picor is design into is serial rapid I/O for a 10 Gps hub and an advanced mezzanine carrier blade; power is –48 V (36 – 75 V) and about 210 W fully configured. The power requirement calls for independent DC-DC and filtering on each blade with the goal of increasing overall system reliability. QPI active EMI filters provide conducted common-mode and differential-mode attenuation from 150 kHz to 30 MHz (CISPR22 range). The proprietary active filtering circuit provides superior attenuation at low frequencies intended to support EN Class B limits, including PICMG
3.0 for ATCA boards.
ATCA blades, with as little as 140 in 2 of available board area, can easily become overcrowded. An active EMI input filter is less than half the size of most passive solutions. For a $12,000 ATCA blade, for example, a QPI filter saves about $85 worth of PCB area. Integrating the EMI filter with hot swap saves even more space, giving designers more room for FPGAs and ASICs.