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


This preview shows page 1 - 2 out of 2 pages.

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.
Background image
Image of page 2

You've reached the end of your free preview.

Want to read both pages?

  • Spring '16
  • n/a
  • Amplifier, Frequency, Impedance, Electronic amplifier, Cascode, Common source, Buffer amplifier, Common emitter, high input impedance

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes