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In spite of the hype, 3G doesn t cut it Third-generation (3G) wireless is a nice idea, but it is a technology looking for a problem to solve All the bandwidth in the world doesn t do much for the consumer if no applications are available to take advantage of it The mini-browsers that accompany many digital cell phones today are cute but frankly worthless for the most part: advertised as the wireless Internet, they re not even close According to various studies, the average number of screens a user has to go through on a minibrowser to reach the site they re looking for is 22 Calling that the wireless Internet is a major marketing blunder; the Internet connotes speed, a large screen, color, and universal access.

Current amplification is often called beta by engineers. It can range from a factor of just a few times up to hundreds of times. One method of expressing the beta of a transistor is as the static forward current transfer ratio, abbreviated HFE. Mathematically, this is HFE IC /IB

10 = 10 log (Pout /94) First, divide each side by 10, getting: 1 = log (Pout /94) To solve this, we must take the base-10 antilogarithm, also known as the antilog, or the inverse log, of each side. The antilog function undoes the log function. The antilog of a value x is written antilog x. It can also be denoted as log 1x or 10x. Antilogarithms can be determined with any good scientific calculator. The solution process goes like this: antilog ( 1) = antilog [log (Pout /94)] 0.1 = Pout /94 94 0.1 = Pout Pout = 9.4 W

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Until applications emerge that are specifically built around the concept of high bandwidth to the cell phone and the known limitations of a mobile device, 3G will flounder..

Thus, if a base current, IB, of 1 mA results in a collector current, IC, of 35 mA, HFE 35/1 35. If IB 0.5 mA yields IC 35 mA, then HFE 35/0.5 70. This definition represents the greatest current amplification possible with a given transistor.

Decibels and Impedance When determining the voltage gain (or loss) and the current gain (or loss) for a circuit in decibels, you should expect to get the same figure for both parameters only when the input impedance is identical to the output impedance. If the input and output impedances differ, the voltage gain or loss is generally not the same as the current gain or loss. Consider how transformers work. A step-up transformer, in theory, has voltage gain, but this alone doesn t make a signal more powerful. A step-down transformer can exhibit theoretical current gain, but again, this alone does not make a signal more powerful. In order to make a signal more powerful, a circuit must increase the signal power the product of the voltage and the current! When determining power gain (or loss) for a particular circuit in decibels, the input and output impedances don t matter. In this sense, positive power gain always represents a real-world increase in signal strength. Similarly, negative power gain (or power loss) always represents a true decrease in signal strength.

Another way of specifying current amplification is as the ratio of the difference in IC to the difference in IB. Abbreviate the words the difference in by the letter d. Then, according to this second definition: Current amplification dIC/dIB

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.

In the previous chapters, you saw some circuits that use bipolar and field effect transistors. A signal can be applied to some control point, causing a much greater signal to appear at the output. This is the principle by which all amplifiers work.

A graph of collector current versus base current (IC vs IB) for a hypothetical transistor is shown in Fig. 22-6. This graph resembles Fig. 22-4, except that current, rather than voltage, is on the horizontal scale. Three different points are shown, corresponding to various bias values.

Recently, while teaching in Europe, I asked a group of 50 people what they wanted from their mobile 3G services provider The answers were voiced almost in a capella harmony: low cost, secure communications, universal access, reasonably good signal quality, and instant messaging No fancy Internet access, no color graphics, just solid communications capability Europe already has this, you see It s called Global System for Mobile Communications (GSM) Perhaps the North American service providers should pay attention Hand-in-hand with the evolution of wireless will be a concomitant evolution in the design, deployment, and use of mobile appliances that are actually useful They will incorporate wireless connectivity, but will be designed not to replace the PC or laptop, but rather to provide spontaneous, just-in-time connectivity to online databases Coupled with ubiquitous connectivity and adequate bandwidth, these devices will herald the arrival of a new wave of mobility.

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