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The Hidden Component to High Speed Filter Design: The Footprint Influence
Keywords: Footprint, modeling, high speed
The role of the passive component filter is becoming very critical in present day’s ultra high-speed data transmission, especially in optical communication systems. Many optical modulation techniques heavily rely on electrical filtering at both ends of the electro-optical system. Critical filter design is required to insure that all parameters of the filter are met at both ends of the system. Accurate 3 dB bandwidth, stable group delay along with forward and reverse return loss characteristics are important in designing high frequency passive filters. For designing correct LPF for ultra high-speed applications, the designer should consider the influence of system bandwidth along with PCB footprint and the filter’s launch pad loss. For different measurement setups, the electrical loss and reflections from the PCB footprints and materials could cause the S-parameters to deviate from the ideal filter shape. Circuit simulation model needs to be optimized for these unwanted influences. Filters needs to be detuned to accommodate these losses. After the satisfactory circuit simulation, designer must use 3-D planar electromagnetic simulator to accurately simulate the complex EM effects including coupling and parasitics among the elements. As the package gets smaller, the coupling and parasitic influences between the closely placed elements reduce the filter performance. Therefore, filter model should be further optimized to consider these influences to achieve desired filter performance. It is very intriguing to design passive filters in a very small package, in the frequency domain of 10 Ghz and above. Modeling the footprint and inserting it in series with the filter model is key to design and manufacture surface mount components that perform as expected. This requires accurate correlation to the filter model. In this work we studied footprint and its influence to optimize component’s performance.
Akhlaq Rahman, Development Engineer
Thin Film Technology Corp.
North Mankato, MN

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