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Imagine a bipolar transistor as consisting of two diodes in reverse series. You can t normally connect two diodes this way and get a working transistor, but the analogy is good for modeling the behavior of bipolar transistors. A dual-diode NPN transistor model is shown in Fig. 22-3A. The base is formed by the connection of the two anodes. The emitter is one of the cathodes, and the collector is the other cathode. Figure 22-3B shows the equivalent real-world NPN transistor circuit.

3. A crystal set: A. Can be used to transmit radio signals. B. Requires a battery with long life. C. Requires no battery. D. Is useful for rectifying 60-Hz ac.

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The NPN Case The normal method of biasing an NPN transistor is to have the collector voltage positive with respect to the emitter. This is shown by the connection of the battery in Figs. 22-3A and 22-3B. Typical dc voltages for a transistor power supply range between 3 V and about 50 V. A typical voltage is 12 V. In the model and also in the real-world transistor circuit, the base is labeled control, because the flow of current through the transistor depends critically on what happens at this electrode. Zero Bias for NPN Suppose the base of a transistor is at the same voltage as the emitter. This is known as zero bias. When the forward bias is zero, the emitter-base current, often called simply base current and de-

When high-speed transport systems such as SONET and SDH were first introduced, the bandwidth that they made possible was unheard of. The early systems that operated at OC-3/STM-1 levels (155.52 Mbps) provided volumes of bandwidth that were almost unimaginable. As the technology advanced to higher levels, the market followed Say s Law, creating demand for the ever-more available volumes of bandwidth. There were limits, however. Today OC-48/STM-16 (2.5 Gbps) is extremely popular, but OC-192/STM-64 (10 Gbps) represents the practical upper limit of SONET s and SDH s transmission capabilities, given the limitations of existing time division multiplexing (TDM) technology. The alternative is to simply multiply the channel count, and that s where WDM comes into play. WDM is really nothing more than frequency division multiplexing (FDM), albeit at very high frequencies. The ITU has standardized a channel separation grid that centers around 193.1 THz, ranging from 191.1 THz to 196.5 THz. Channels on the grid are technically separated by 100 GHz, but many industry players today are using 50-GHz separation. The majority of WDM systems operate in the C-band (third window, 1,550 nm), which enables the close placement of channels and the reliance on EDFAs to improve signal strength. Older systems, which spaced the channels 200 GHz (1.6 nm) apart, were referred to simply as WDM systems, while the newer systems are referred to as Dense WDM systems because of their tighter channel spacing. Modern systems routinely pack 40- to 10-Gbps channels across a single fiber for an aggregate bit rate of 400 Gbps.

4. A diode detector: A. Is used in power supplies. B. Is employed in some radio receivers. C. Is used commonly in high-power radio transmitters. D. Changes dc into ac. 5. If the output wave in a circuit has the same shape as the input wave, then: A. The circuit is linear. B. The circuit is said to be detecting. C. The circuit is a mixer. D. The circuit is a rectifier. 6. The two input frequencies of a mixer circuit are 3.522 MHz and 3.977 MHz. Which of the following frequencies might be used at the output A. 455 kHz. B. 886 kHz. C. 14.00 MHz. D. 1.129 MHz.

noted IB, is zero, and the emitter-base (E-B) junction does not conduct. This prevents current from flowing between the emitter and collector, unless a signal is injected at the base to change the situation. Such a signal must, at least momentarily, attain a positive voltage equal to or greater than the forward breakover voltage of the E-B junction.

There is one property of electronic components that you ll sometimes hear called impedance, that really isn t impedance at all. This is characteristic impedance or surge

As Figure 6-22 illustrates, a WDM system consists of multiple input lasers, an ingress multiplexer, a transport fiber, an egress multiplexer, and, of course, customer receiving devices. If the system has eight

impedance. It is abbreviated Zo, and is a specification of transmission lines. It can always be expressed as a positive real number.

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