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31 Amplifier Circuit Configurations
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311 Introduction
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Amplifiers come in three different basic flavors, each with its own distinct application and capability They are referred to as common-base, common-collector, and commonemitter amplifiers, depending on whether the base, collector, or emitter is common to both the input and output of the amplifier circuit
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Common-Base Amplifier
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With an input signal inserted at the emitter, and with the output taken from the collector circuit, we have our first configuration, the common-base amplifier (Fig 31) The common-base (CB) can be found operating as a voltage amplifier for low input impedance circuits It also possesses a high output impedance and a power amplification due to P = V2/R, but current gain will always be a little less than unity However, even though the CB amplifier has superior temperature stability and linearity, and can easily operate
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INPUT OUTPUT
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FIGURE 31
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A common-base ampli er circuit
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at very high frequencies, it is not nearly as common as the next two configurations the common-emitter and the common-collector amplifiers This is due partly to the common-base s low input impedance (50 to 75 ) Nonetheless, CB amplifiers can occasionally be found at the 50- antenna input of a receiver, or as Class C highfrequency amplifiers The JFET version of the BJT s common-base, a common-gate amplifier, can be seen in the IF of some receivers, with one such circuit shown in Fig 32 C2, C3, R2, and the radio frequency choke (RFC) are for decoupling; C4 and C6 are for RF coupling; C5 can be tweaked to obtain a flatter frequency response throughout its passband; T1 is for matching of its low input impedance, as required
C3 C1 Q1 C6 IF INPUT T1 R1 RFC C4 IF OUTPUT
FIGURE 32
A common-gate JFET ampli er
Amplifier Design
Common-Emitter Amplifier
The most popular amplifier circuit arrangement in all of electronics is the commonemitter (CE) A low frequency example is shown in Fig 33 The bias circuit displayed in the figure is only one of the many ways to bias common-emitter amplifiers (see Sec 36) A CE amplifier has a greater current and voltage gain combination than any other type In fact, common-emitter amplifier configurations are capable of increasing not only voltage and current, but also make excellent power amplifiers A common-emitter amplifier functions when a signal is placed at the base of the transistor, an amplified output is extracted from the collector s output circuit This output voltage will have been shifted by approximately 180 in phase when compared to the signal present at the amplifier s own input, due to the following action: As the signal at the transistor s base turns more positive, an increase in current will flow through the transistor This decreases the transistor s resistance, and thus the voltage that is dropped across its collector-emitter junction, or from the collector to ground Considering that the output signal will be taken from the voltage that is dropped across the transistor s collector and the load resistor (RC) will now be dropping the voltage that was formerly available to the collector a shift in the phase at the amplifier s output is created that is precisely the reverse to that of the input signal At RF frequencies a large difficulty in CE amplifiers is an effect called positive feedback, which creates amplifier instability and oscillations due to the internal feedback capacitance between the transistor s collector and its base This collector-to-base capacitance can be as high as 25 pF or more in certain types of bipolar transistors At a specific frequency, this capacitance will send an in-phase signal back into the base input from the collector s output, which will create, for all intensive purposes, an oscillator In other words, to give birth to the undesired CE oscillations, the internal capacitance and resistance of the transistor, along with other phase delays, must yield a powerful phase
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