1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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Equalizers are generally associated with devices designed to reduce or remove group delay and/or amplitude and/or phase variations across a filter band. However, some equalizers are meant to flatten gain across the operational band of an amplifier, filter, or complete system.
Higher order filters, with corresponding greater out-of-band attenuation, exhibit higher levels of group delay variations at the band edges. Group delay variation distorts signals by varying the time that the spectral components to move from the input to the output of the filter. Square waves, for instance, contain their highest frequency components at the band edges, so on a filter with a lot of group delay, the square wave will exit with rounded and otherwise distorted edges. Such distortion can (and will) negatively affect the bit error rate (BER) of digital communications.
Aeroflex-Inmet (now API Technologies)
| 408-432-8039 | San Jose, CA
Blueline Engineering Corp
Eclipse Microwave | 408-526-1100 | San Jose,
Inmet (now API Technologies)
| 732-636-1900 | Avenel, NJ
Mica Microwave (now Mercury Systems)
Circuits | 434-455-2800 | Lynchburg, VA
Midwest Microwave (now Emerson Network
Corp | 408-232-9200 | San Jose, CA
Wood Associates | www.315-735-4217 | Utica,