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The bias is set by the ratio of resistances R2 and R3. It can be anything from zero, or ground potential, to + 12 V, the supply voltage. Normally it will be a couple of volts. Capacitors C2 and C3 block dc to or from the input and output circuitry (whatever that might be) while letting the ac signal pass. Resistor R4 keeps the output signal from being shorted out through the power supply. A signal voltage enters the common-emitter circuit through C2, where it causes the base current, IB to vary. The small fluctuations in IB cause large changes in the collector current, IC. This current passes through R4, causing a fluctuating dc voltage to appear across this resistor. The ac part of this passes unhindered through C3 to the output. The circuit of Fig. 22-9 is the basis for many amplifiers, from audio frequencies through ultra-high radio frequencies. The common-emitter configuration produces the largest gain of any arrangement. The output is 180 degrees out of phase with the input.

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You ll sometimes hear of class AB or class B linear amplifiers, especially in ham radio The term linear refers to the fact that the modulation waveform is not distorted by such an amplifier, even though the carrier waveform is distorted because the transistor is not biased in the straight-line part of the operating curve Class AB2 and class B amplifiers draw power from the input signal source Engineers say that such amplifiers require a certain amount of drive or driving power to function Class A and class AB1 amplifiers theoretically need no driving power, although there must be an input voltage The Class B Push-Pull Amplifier Sometimes two bipolar transistors or FETs are used in a class B circuit, one for the positive half of the cycle and the other for the negative half In this way, signal waveform distortion is eliminated.

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As its name implies, the common-base circuit, shown in general form by Fig. 22-10, has the base at signal ground. The dc bias on the transistor is the same for this circuit as for the common-emitter circuit. The difference is that 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 dc current through R4. Therefore amplification occurs.

22-10

This is called a class B push-pull amplifier This type of circuit, using two NPN bipolar transistors, is illustrated in Fig 24-5 Resistor R1 limits the current through the transistors Capacitor C1 keeps the input transformer center tap at signal ground, while allowing for some dc base bias Resistors R2 and R3 bias the transistors precisely at their cutoff points The two transistors must be identical Not only should their part numbers be the same, but ideally they should be chosen by experiment to ensure that their characteristic curves are as closely matched as possible Class B push-pull is a popular arrangement for audio-frequency (AF) power amplification It combines the efficiency of class B with the low distortion of class A Its main disadvantage is that it needs two center-tapped transformers, one at the input and the other at the output.

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Instead of varying IB by injecting the signal at the base, it s being done by injecting the signal at the emitter. Therefore, in the common-base arrangement, the output signal is in phase with the input, rather than out of phase. The signal enters through 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 through C3. The common-base circuit provides somewhat less gain than a common-emitter circuit. But it is more stable than the common-emitter configuration in some applications, especially in radio-frequency power amplifiers.

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