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408 The bipolar transistor make an amplifier using a transistor at a frequency higher than its fT, you ll fail! Thus fT represents an absolute upper limit of sorts. The alpha cutoff frequency of a transitor is the frequency at which the gain becomes 0.707 times its value at 1 kHz. A transistor might still have considerable gain at its alpha cutoff. By looking at the alpha cutoff frequency, you can get an idea of how rapidly the transistor loses gain as the frequency goes up. Some devices die-off faster than others. Figure 22-8 shows the gain band width product and alpha cutoff frequency for a hypothetical transistor, on a graph of gain versus frequency. Note that the scales of this graph are nonlinear; they re scrunched up at the higher values. This type of graph is useful for showing some functions. It is called a log-log graph because both scales are logarithmic rather than linear.

Convergence is real and it s only just begun. The move to a single-network fabric for the transport of multiple service types is underway and will happen. However, the imminent demise of the circuit switch is exaggerated. In the local market, these devices will be around for some time

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the sensitivity. In power amplifiers, efficiency is more important, and gain and sensitivity don t matter as much. When a bipolar transistor is biased close to cutoff under no-signal conditions, or when an FET is near pinchoff, the input signal always drives the device into the nonlinear part of the operating curve. Typical bias zones for class AB are shown in Figs. 24-3 and 24-4. A small collector or drain current flows when there is no input, but it is less than the no-signal current that flows in a class A amplifier. This is called class AB operation. It s more efficient than class A, but the gain and sensitivity are not as high. There are two modes of class AB amplification. If the bipolar transistor or FET is never driven into cutoff/pinchoff during any part of the signal cycle, the amplifier is working in class AB1. If the device goes into cutoff pinchoff for any part of the cycle (up to almost half ), the amplifier is working in class AB2. In a class AB amplifier, the output signal waveform is not identical with the input signal waveform. But if the signal wave is modulated, such as in a voice radio transmitter, the waveform of the modulating signal comes out undistorted anyway. Thus, class AB operation is useful in RF power amplifiers.

A transistor can be hooked up in three general ways. The emitter can be grounded for signal, the base can be grounded for signal, or the collector can be grounded for signal. Probably the most often-used arrangement is the common-emitter circuit. Common means grounded for the signal. The basic configuration is shown in Fig. 22-9. A terminal can be at ground potential for the signal, and yet have a significant dc voltage. In the circuit shown, C1 looks like a dead short to the ac signal, so the emitter is at signal ground. But R1 causes the emitter to have a certain positive dc voltage with respect to ground (or a negative voltage, if a PNP transistor is used). The exact dc voltage at the emitter depends on the value of R1, and on the bias.

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The Class B Amplifier When a bipolar transistor is biased exactly at cutoff, or an FET is biased exactly at pinchoff under zero-input-signal conditions, an amplifier is working in class B These operating points are labeled on the curves in Figs 24-3 and 24-4 The class B scheme lends itself well to RF power amplification In class B operation, there is no collector or drain current when there is no signal This saves energy, because the circuit does not consume power unless there is a signal going into it (Class A and class AB amplifiers consume some power even when the input is zero) When there is an input signal, current flows in the device during exactly half of the cycle The output signal waveform is greatly different from the input waveshape in a class B amplifier In fact, it is half-wave rectified.

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