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R F and microwave power amplifiers and transmitters are used in a wide variety of applications including wireless communication, jamming, imaging, radar, and RF heating. This article provides an introduction and historical background for the subject, and begins the technical discussion with material on signals, linearity, efficiency, and RF-power devices.(More)
L inearization techniques are incorporated into power amplifiers and transmitters for the dual purposes of improving linearity and for allowing operation with less back-off and therefore higher efficiency. This article provides a summary of the three main families of techniques have been developed: Feedback, feedforward, and predistortion. Feedback(More)
T he building blocks used in transmitters are not only power amplifiers, but a variety of other circuit elements including oscil-lators, mixers, low-level amplifiers, filters, matching networks, combiners, and circulators. The arrangement of building blocks is known as the architecture of a transmitter. The classic transmitter architecture is based upon(More)
The ever-increasing demands for more band-width, coupled with requirements for both high linearity and high efficiency create ever-increasing challenges in the design of power amplifiers and transmitters. A single W-CDMA signal, for example, taxes the capabilities of a Kahn-technique transmitter with a conventional class-S modulator. More acute are the(More)
The UK digital terrestrial television (DTT) network has completed its first phase of roll-out, with over 70% of the population now able to receive all six digital multiplexes. Whilst this is an impressive achievement, the current analogue TV network can cover 99.7% of the UK population and digital satellite systems can boast virtually 100% coverage, so DTT(More)
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