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taking advantage of them to carve out niches for themselves in the bandwidth marketplace. In fact, bandwidth has become a commodity, traded on spot markets alongside soy beans and pork bellies. A feeding frenzy is underway as the telecommunications market converges. Companies are buying each other apace as they jockey for position in the greatest game in town, and they are doing so by implementing new applications with names like Enterprise resource planning and Customer relationship management. Cellular telephony is ubiquitous, and integrated handsets are hitting the market. Iridium, once a shining star, is in receivership. AOL is a powerhouse as the biggest ISP on the planet. They now own CompuServe, and Prodigy has become invisible. Windows 2000 is on the market, and Apple s future as a real player is uncertain. Due to the popularity of Linux, Unix has entered the mindset and vocabulary of ordinary people on the street. Firewalls, still uncommon five years ago, are now finding a market as home-based computer systems obtain 24 7 access to the Internet using cable modems and DSL technologies. IP is now ubiquitous. NetWare version 5 will run natively over IP. All 32-bit versions of Windows (Windows 95, and so on) have a built-in TCP/IP kernel. IP version 6 (IPv6) is three years old but has yet to see widespread implementation. The IETF is now an international standards organization, sanctioned by ISO. Cisco dominates the router marketplace at the high- and middle-range, and is even a force at the low-end. 2000 came and went without incident. IT professionals who planned to have a New Years Eve party in their offices waiting for the ringing telephones, lost power, crashed computers, and other unnatural disasters that would inevitably occur at 00:00:00.00 on 1/1/2000, were sorely disappointed.

23-1 Simplified cross-sectional drawing of an N-channel JFET (at A) and its schematic symbol (at B).

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Class A and AB1 power amplifiers do not, in theory, take any power from the signal source to produce significant output power. This is one of the advantages of these classes of operation. It is only necessary that a certain voltage be present at the control electrode (the base, gate, emitter, or source) for these circuits to produce useful output signal power. Class AB2 amplifiers need some driving power to produce ac power output. Class B amplifiers require more drive than class AB2, and class C amplifiers need still more drive. Whatever kind of PA is used in a given situation, it is important that the driving signal not be too strong. If overdrive takes place, distortion occurs in the output signal. An oscilloscope can be used to determine whether or not an amplifier is being overdriven. The scope is connected to the amplifier output terminals, and the waveform of the output signal is examined. The output waveform for a particular class of amplifier always has a characteristic shape. Overdrive is indicated by a form of distortion known as flat topping. In Fig. 24-6A, the output signal waveshape for a properly operating class B amplifier is shown. In Fig. 24-6B, the output of an overdriven class B amplifier is shown. Note that the peaks are blunted or truncated. The result of this can be distortion in the modulation on a radio signal, and 24-6 At A, an oscilloscope

In an N-channel device, the gate consists of P-type material. Another, larger section P-type material, called the substrate, forms a boundary on the side of the channel opposite the gate. The JFET is formed in the substrate during manufacture by a process known as diffusion. The voltage on the gate produces an electric field that interferes with the flow of charge carriers through the channel. The more negative EG becomes, the more the electric field chokes off the current though the channel, and the smaller ID becomes. A P-channel JFET (Fig. 23-2) has a channel of P-type semiconductor. The majority charge carriers are holes. The drain is negative with respect to the source. In a sense, holes are injected into the source and are collected from the drain. The gate and the substrate are of N-type material. In the P-channel JFET, the more positive EG gets, the more the electric field chokes off the current through the channel, and the smaller ID becomes. You can recognize the N-channel device by the arrow pointing inward at the gate, and the P-channel JFET by the arrow pointing outward. Also, you can tell which is which (sometimes arrows are not included in schematic diagrams) by the power-supply polarity. A positive drain indicates an N-channel JFET, and a negative drain indicates a P-channel type.

Summary

display of the signal output waveform from a properly operating class B power amplifier. At B, a display showing distortion in the waveform caused by overdrive.

23-2 Simplified cross-sectional drawing of a P-channel JFET (at A) and its schematic symbol (at B).

also an excessive amount of signal output at harmonic frequencies. The efficiency of the circuit can be degraded, as well. The flat tops of the distorted waves don t contribute anything to the strength of the signal at the desired frequency, but they cause a higher-than-normal dc power input, which translates into a lower-than-normal efficiency.

This chapter is designed to acquaint the reader with the fundamental terms and concepts that characterize the data and telecommunications worlds today. Now we can move deeper into the magic. In the next chapter, we introduce the design, philosophy, structure, and use of data communications protocols.

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