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This chapter, and this whole first section, is mostly concerned with direct current (dc). That s electric current that always flows in the same direction and that does not change in intensity (at least not too rapidly) with time. But household utility current is not of this kind. It reverses direction periodically, exactly once every 1/120 second. It goes through a complete cycle every 1/60 second. Every repetition is identical to every other. This is alternating current (ac). Figure 2-8 shows the characteristic wave of ac, as a graph of voltage versus time. Notice that the maximum positive and negative voltages are not 117 V, as you ve heard about household electricity, but close to 165 V. There is a reason for this difference. The effective voltage for an ac wave is never the same as the instantaneous maximum, or peak, voltage. In fact, for the common waveform shown in Fig. 2-8, the effective value is 0.707 times the peak value. Conversely, the peak value is 1.414 times the effective value.

Radio-frequency transformers 339 The required transformer will have a step-up impedance ratio of Zpri/Zsec 50.0/300 1:6.00. From the above formulas, Tpri/Tsec (Zpri/Zsec)1/2 (1/6.00)1/2 0.166671/2 0.40829

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HomePNA is a not-for-profit association founded in 1998 by 11 companies to bring about the creation of uniform standards for the deployment of interoperable in-home networking solutions. The companies, 3Com, AMD, AT&T Wireless, Compaq, Conexant, Epigram, Hewlett-Packard, IBM, Intel, Lucent Technologies, and Tut Systems, are committed to the design of in-home communications systems that will enable the transport of LAN protocols across standard telephone inside wire. HomePNA operates at 1 Mbps and enables the user to employ every RJ-11 jack in the house as both telephone and data ports for the interconnection of PCs, peripherals, and telephones. The standard enables interoperability with existing access technologies such as xDSL and ISDN, and therefore provides a good migration strategy for Small Office/Home Office (SOHO) and telecommuter applications. The initial deployment utilizes Tut Systems HomeRun product, which enables telephones and computers to share the same wiring and to simultaneously transmit. Extensive tests have been performed by the HomePNA, and although some minor noise problems caused by AC power and telephonycoupled impedance have resulted, they have been able to eliminate the effect through the use of low-pass filters between the devices causing the noise and the jack into which they are plugged.

alternating current (ac). The instantaneous voltage is the voltage at any particular instant in time. The peak voltages are approximately plus and minus 165 V.

A couple of extra digits are included (as they show up on the calculator) to prevent the sort of error introduction you recall from earlier chapters. The decimal value 0.40829 can be changed into ratio notation by taking its reciprocal, and then writing 1: followed by that reciprocal value 0.40829 1:(1/0.40829) 1:2.4492

Because the whole cycle repeats itself every 1/60 second, the frequency of the utility ac wave is said to be 60 hertz, abbreviated 60 Hz. The German word hertz literally translates to cycles per second. In the United States, this is the standard frequency for ac. In some places it is 50 Hz. In wireless communications, higher frequencies are common, and you ll hear about kilohertz (kHz), megahertz (MHz), and gigahertz (GHz). The relationships among these units are as follows: 1 kHz = 1000 Hz 1 MHz = 1000 kHz = 1,000,000 Hz 1 GHz = 1000 MHz = 1,000,000 kHz = 1,000,000,000 Hz Usually, but not always, the waveshapes are of the type shown in Fig. 2-8. This waveform is known as a sine wave or a sinusoidal waveform.

It would be irresponsible of me to write a book like this without at least mentioning the content that rides on today s networks. The section that follows explores multimedia and all its many flavors. Multimedia is the primary driving force for bandwidth today. An understanding of what it is and where it is going is important. Besides, it s fascinating stuff.

This can be rounded to three significant figures, or 1:2.45. This is the primary-tosecondary turns ratio for the transformer. The secondary winding has 2.45 times as many turns as the primary winding.

For a semiconductor material to have the properties necessary in order to function as electronic components, impurities are usually added. The impurities cause the material to conduct currents in certain ways. The addition of an impurity to a semiconductor is called doping. Sometimes the impurity is called a dopant.

Problem 18-4

In the last decade a revolution has taken place in visual applications. Starting with simple, still image-based applications such as grayscale facsimile, the technology has diverged into a collection of visually oriented applications that include video and virtual reality. Driven by

A transformer has a primary-to-secondary turns ratio of 4.00:1. The load, connected to the transformer output, is a pure resistance of 37.5 . What is the impedance at the primary The impedance-transfer ratio is equal to the square of the turns ratio. Therefore, Zpri/Zsec (Tpri/Tsec)2 (4.00/1)2 4.002 16.0

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