Active filters control EMI, save PCB space and enhance airflow
- Author: Chester Firek
The trend toward smaller devices with more functionality in smaller spaces continues unabated in the electronics industry. As spaces shrink, the potential for interference between devices increases as systems fit more functions in densely-packed boards and racks. As frequencies rise and voltage levels fall, the control of conducted EMI becomes an even more important design task. EMI control, a complex design task that is highly dependent on many design elements makes use of filters, both passive and active, to manage conducted noise. Active EMI filters, in contrast to passive solutions, reduce the volume of the common-mode choke allowing the filter to be packaged in a 1 x 1 x 0.2in package and provide a low-profile surface-mount device. The smaller size saves valuable board real estate and the reduced height enhances airflow for better heat management.
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