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April 2010 [Components] Wilkinson Divider Powers TV Transmitters As digital technology infiltrates an increasing number of applications, RF/ microwave components are handling more bandwidth to keep pace. For broadcast UHF television, for example, a power divider must handle the entire frequency range from 470 to 806 MHz with relative low loss and good amplitude and phase characteristics to ensure the integrity of the transmitted digital signals. For this purpose, a three-way Wilkinson power divider was ... January 2010 [Components] Dissect PA Distortion From OFDM Signals Power-amplifier (PA) distortion must be minimized in any broadcast application to prevent interference with adjacent channels. Distortion can be present in the form of amplifier clipping, intermodulation distortion (IMD), and memory effects. For some communications standards, such as Brazil’s ISDB-T standard, which is based on orthogonal frequency- division-multiplex (OFDM) modulation, excessive phase distortion in the transmit amplifiers... |
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