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Common-base circuit
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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.
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410 The bipolar transistor
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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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Common-collector circuit
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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 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.
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Common-base circuit configuration.
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Quiz 411
22-11 Common-collector circuit configuration. This arrangement is also known as an emitter follower.
The output of this circuit is in phase with the input. The input impedance is high, and the 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.
Quiz
Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 1. In a PNP circuit, the collector: A. Has an arrow pointing inward. B. Is positive with respect to the emitter. C. Is biased at a small fraction of the base bias. D. Is negative with respect to the emitter. 2. In many cases, a PNP transistor can be replaced with an NPN device and the circuit will do the same thing, provided that: A. The supply polarity is reversed.
412 The bipolar transistor B. The collector and emitter leads are interchanged. C. The arrow is pointing inward. D. No! A PNP device cannot be replaced with an NPN. 3. A bipolar transistor has: A. Three P-N junctions. B. Three semiconductor layers. C. Two N-type layers around a P-type layer. D. A low avalanche voltage. 4. In the dual-diode model of an NPN transistor, the emitter corresponds to: A. The point where the cathodes are connected together. B. The point where the cathode of one diode is connected to the anode of the other. C. The point where the anodes are connected together. D. Either of the diode cathodes. 5. The current through a transistor depends on: A. EC. B. EB relative to EC. C. IB. D. More than one of the above. 6. With no signal input, a bipolar transistor would have the least IC when: A. The emitter is grounded. B. The E-B junction is forward biased. C. The E-B junction is reverse biased. D. The E-B current is high. 7. When a transistor is conducting as much as it possibly can, it is said to be: A. In cutoff. B. In saturation. C. Forward biased. D. In avalanche. 8. Refer to Fig. 22-12. The best point at which to operate a transistor as a small-signal amplifier is: A. A. B. B. C. C. D. D.
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