Peter B. Kenington

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6a. BASIC TECHNIQUES FOR RF POWER AMPLIFICATION RF power amplifiers are commonly designated as classes A, B, C, D, E, and F [19]. All but class A employ various nonlinear, switching, and wave-shaping techniques. Classes of operation differ not in only the method of operation and efficiency, but also in their power-output capability. The power-output(More)
The building blocks used in transmitters are not only power amplifiers, but a variety of other circuit elements including oscillators, 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 bandwidth, coupled with requirements for both high linearity and high efficiency create everincreasing 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)
RF Feedback The basis of this technique is similar to its audio-frequency counterpart. A portion of the RF-output signal from the amplifier is fed back to, and subtracted from, the RF-input signal without detection or downconversion. Considerable care must be taken when using feedback at RF as the delays involved must be small to ensure stability. In(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)
RF 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. At(More)
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