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The PIV rating of a diode is the instantaneous inverse, or reverse-bias, voltage that it can withstand without avalanche taking place. A good power supply has diodes whose PIV ratings are significantly greater than the peak voltage of the ac at the input. If the PIV rating is not great enough, the diode or diodes in a supply will conduct for part of the reverse cycle. This will degrade the efficiency of the supply; the reverse current will buck the forward current. It would be like having a team of rowers in a long boat, with one or two rowers trying to propel the boat backwards instead of forwards. Diodes can be connected in series to get a higher PIV capacity than a single diode alone. This scheme is sometimes seen in high-voltage supplies, such as those needed for tube-type ham radio power amplifiers. High-value resistors, of about 500 for each peak-inverse volt, are placed across each diode in the set to distribute the reverse bias equally among the diodes (Fig. 21-4). Also, each diode is shunted by a capacitor of 0.005 F or 0.1 F.

As its name implies, the common base circuit (Fig. 22-10) has the base at signal ground. The dc bias is the same as for the common emitter circuit, but the input signal is applied at the emitter, instead of at the base. This causes fluctuations in the voltage across R1, causing variations in IB. The result of these small current fluctuations is a large change in the current through R4. Therefore, amplification occurs. The output wave is in phase with the input wave. The signal enters through capacitor C1. Resistor R1 keeps the input signal from being shorted to ground. Bias is provided by R2 and R3. Capacitor C2 keeps the base at signal ground. Resistor R4 keeps the signal from being shorted out through the power supply. The output is taken through C3. The common base circuit provides somewhat less gain than a common emitter circuit. However, it is more stable than the common emitter configuration in some applications, especially RF power amplifiers.

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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.

The simplest rectifier circuit uses just one diode (or a series or parallel combination) to chop off half of the ac input cycle. You saw this circuit in the previous chapter, diagrammed in Fig. 20-1. In a half-wave circuit, the average output voltage is approximately 45 percent of the rms ac input voltage. But the PIV across the diode can be as much as 2.8 times the rms ac input voltage. It s a good idea to use diodes whose PIV ratings are at least 1.5 times the

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

The bridge rectifier 387 maximum expected PIV; therefore, with a half-wave supply, the diodes should be rated for at least 4.2 times the rms ac input voltage. Half-wave rectification has some shortcomings. First, the output is hard to smooth out, because the waveform is so irregular. Second, the voltage output tends to drop when the supply is connected to a load. (This can be overcome to some extent by means of a good voltage regulator. Voltage regulation is discussed later in this chapter.) Third, half-wave rectification puts a disproportionate strain on the power transformer and the diodes. Half-wave rectification is useful in supplies that don t have to deliver much current, or that don t need to be especially well regulated. The main advantage of using a half-wave circuit in these situations is that it costs a little less than full-wave or bridge circuits.

relatively low-intelligence function and is therefore accomplished quite quickly. Such technologies as ATM; Frame Relay; wireless access technologies such as FDMA, TDMA, and CDMA; and LAN access control protocols (Carrier Sense Multiple Access with Collision Detection [CSMA/CD] and token passing) are found at this layer. Routing, on the other hand, is a layer 3 (Network layer) function. It operates at a higher, more complex level of functionality and is therefore more complex. Routing concerns itself with the movement of traffic between subnetworks and therefore complements the efforts of the switching layer. ATM, Frame Relay, LAN protocols, and the Public Switched Telephone Network (PSTN) are switching protocols. The Routing Internet Protocol (RIP), Open Shortest Path First (OSPF), and Internetwork Packet Exchange (IPX) are routing protocols.

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. The output wave of a common collector circuit is in phase with the input wave. This circuit is unique because its input impedance is high, while its 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.

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