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This makes push-pull amplifiers rather bulky and expensive compared to other types The Class C Amplifier A bipolar transistor or FET can be biased past cutoff or pinchoff, and it will still work as a power amplifier (PA), provided that the drive is sufficient to overcome the bias during part of the cycle This is known as class C operation Bias points for class C are labeled in Figs 24-3 and 24-4 Class C amplifiers are nonlinear, even for amplitude modulation waveforms Because of this, a class C circuit is useful only for signals that are either full-on or full-off Such signals include oldfashioned Morse code, and digital schemes in which the frequency or phase (but not the amplitude) of the signal is varied A class C amplifier needs a lot of driving power The gain is low.

Darwinian evolution is alive and well in the telecommunications business and only the fittest will survive Fittest, of course, is a measure of the degree to which a company meets customer demand through the proper and judicious deployment of new technologies as a way to offer competitive advantage Although there will always be a need for protection against predatory, anti-competitive behavior, an open marketplace with minimal regulation is wise and necessary Contrived competition and protectionism are bad things and do nothing to prepare companies for a truly competitive environment Thus, regulators will become guidance agencies, tasked with the responsibility to work themselves out of a job as the industry becomes more and more independent The metro environment will become a central marketplace in the next three to five years Metropolitan networking is undergoing a huge growth spurt in response to changing customer business models.

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A common-collector circuit (Fig. 22-11) operates with the collector at signal ground. The input is applied at the base just as it is with the common-emitter circuit. The signal passes through C2 onto the base of the transistor. Resistors R2 and R3 provide the correct bias for the base. Resistor R4 limits the current through the transistor. Capacitor C3 keeps the collector at signal ground. A fluctuating direct current flows through R1, and a fluctuating dc voltage therefore appears across it. The ac part of this voltage passes through C1 to the output. Because the output follows the emitter current, this circuit is sometimes called an emitter follower circuit.

For example, it might take 300 W of signal drive to get 1 kW of signal power output However, the efficiency is better than that of class A, AB, or B amplifiers Let s take a closer look, now, at what amplifier efficiency is all about..

22-11 Common-collector circuit configuration. This arrangement is also known as an emitter follower.

Long-haul networks are largely complete and offer massive overcapacitization of bandwidth In the metro space, however, bandwidth is in short supply and, where available, is inflexible New technologies deployed by metrofocused companies such as Yipes! And Telseon will change the metro space and expand it as a viable and lucrative market for service providers and manufacturers alike Globalization is real, painful, and necessary According to a recent article in The Economist, globalization today is largely dependent upon falling telecommunications costs As the costs of optical transmission, Internet and telephone connectivity, satellite deployment, switching centers, and semiconductors plummet, the degree to which these technologies can be used to weave a tighter and more cohesive global communications fabric becomes greater and greater Low-cost communi-.

In power amplification, efficiency is important. It not only provides optimum output power with minimum heat generation and minimum strain on the transistors, but it conserves energy as well. This translates into reduced cost, reduced size and weight, and longer equipment life compared with inefficient power amplifiers.

The output of this circuit is in phase with the input. The input impedance is high, and the output impedance is low. For this reason, the common-collector circuit can be used to match high impedances to low impedances. When well designed, an emitter follower works over a wide range of frequencies, and is a low-cost alternative to a broadband impedance-matching transformer.

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

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