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When conditions are like those in Fig. 22-7, there will be distortion in a transistor amplifier. The output waveform will not have the same shape as the input waveform. This nonlinearity can sometimes be tolerated; sometimes it cannot. The more serious trouble with overdrive is the fact that the transistor is in or near saturation during part of the cycle. When this happens, you re getting no bang for the buck. The transistor is doing futile work for a portion of every wave cycle. This reduces circuit efficiency, causes excessive collector current, and can overheat the base-collector (B-C) junction. Sometimes overdrive can actually destroy a transistor.

Amplifier circuits can be categorized as class A, class AB, class B, and class C. Each class has its own special characteristics, and works best in its own unique set of applications.

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Another important specification for a transistor is the range of frequencies over which it can be used as an amplifier. All transistors have an amplification factor, or gain, that decreases as the signal frequency increases. Some devices will work well only up to a few megahertz; others can be used to several gigahertz. Gain can be expressed in various different ways. In the above discussion, you learned a little about current gain, expressed as a ratio. You will also sometimes hear about voltage gain or power gain in amplifier circuits. These, too, can be expressed as ratios. For example, if the voltage gain of a circuit is 15, then the output signal voltage (rms, peak, or peak-to-peak) is 15 times the input signal voltage. If the power gain of a circuit is 25, then the output signal power is 25 times the input signal power. There are two expressions commonly used for the gain-versus-frequency behavior of a bipolar transistor. The gain bandwidth product, abbreviated fT, is the frequency at which the gain becomes equal to 1 with the emitter connected to ground. If you try to

The Class A Amplifier With the previously mentioned component values, the amplifier circuits in Figs. 24-1 and 24-2 operate in class A. This type of amplifier is linear, meaning that the output waveform has the same shape as (although a much greater amplitude than) the input waveform. For class A operation with a bipolar transistor, the bias must be such that, with no signal input, the device is near the middle of the straight-line portion of the IC versus IB (collector current versus base current) curve. This is shown for an NPN transistor in Fig. 24-3. For PNP, reverse the polarity signs. With a JFET or MOSFET, the bias must be such that, with no signal input, the device is near the middle of the straight-line part of the ID versus EG (drain current versus gate voltage) curve. This is shown in Fig. 24-4 for an N-channel JFET. For P channel, reverse the polarity signs. In a class A amplifier, it is important that the input signal not be too strong. An excessively strong input signal will drive the device out of the straight-line part of the characteristic curve during part of the cycle. When this occurs, the output waveshape will not be a faithful reproduction of the input waveshape, and the amplifier will become nonlinear. Class A amplifiers are supposed to operate in a linear fashion at all times. The Class AB Amplifier Class A operation is inefficient because the transistor draws current whether there is a signal input or not. For weak-signal work, efficiency is not too critical; the things that matter are the gain and

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