ADVANTAGE OF COMMON EMITTER - ADVANTAGE OF COMMON EMITTER IT AMPLIFIES THE GAIN Application of common base amplifier This arrangement is not very common

ADVANTAGE OF COMMON EMITTER - ADVANTAGE OF COMMON EMITTER...

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ADVANTAGE OF COMMON EMITTER :IT AMPLIFIES THE GAINApplication of common base amplifierThis arrangement is not very common in low-frequency circuits, where it is usually employed foramplifiers that require an unusually low input impedance, for example to act as a preamplifierformoving-coil microphones. However, it is popular in high-frequency amplifiers, for example for VHFand UHF, because its input capacitance does not suffer from the Miller effect, which degrades the bandwidth of the common emitterconfiguration, and because of the relatively high isolation between the input and output. This high isolation means that there is little feedback from the output back to the input, leading to high stability.This configuration is also useful as a current buffer since it has a current gain of approximately unity(see formulas below). Often a common base is used in this manner, preceded by a common emitter stage. The combination of these two form the cascodeconfiguration, which possesses several of the benefits of each configuration, such as high input impedance and isolation.
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  • Spring '16
  • n/a
  • Amplifier, Frequency, Impedance, Electronic amplifier, Cascode, Common source, Buffer amplifier, Common emitter, high input impedance

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