RF and Microwave Power Amplifier and Transmitter Technologies — Part 3
High Frequency Electronics
Frederick H. Raab, Peter Asbeck, Steve Cripps, Peter B. Kenington, Zoya B. Popovich, Nick Pothecary, John F. Sevic and Nathan O. Sokal
The building blocks used in transmit-ters are not only power amplifiers, but a variety of other circuit elements including oscil-lators, mixers, low-level amplifiers, filters, match-ing networks, combiners,and circulators. The arrangement of building blocks is known as the architecture of a transmitter. The classic transmitter architecture is based upon linear PAs and power combiners. More recently, transmitters are being based upon a variety of different architectures including stage bypassing, Kahn, envelope tracking, outphas-ing, and Doherty. Many of these are actually fairly old techniques that have been recently made practical by the capabilities of DSP.
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