application of collector-feedback biasing

Discussion in 'Homework Help' started by den, Mar 4, 2006.

  1. den

    Thread Starter New Member

    Mar 3, 2006
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    any?
     
  2. hgmjr

    Moderator

    Jan 28, 2005
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    Is this your question?

    "Is there any reason to use collector-feedback other than to set the gain of a common emitter transistor ampilifer?"

    If I have misphrased your question, can you please restate it?

    hgmjr
     
  3. den

    Thread Starter New Member

    Mar 3, 2006
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    true.
     
  4. hgmjr

    Moderator

    Jan 28, 2005
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    I know of no other reason to use a collector-to-base feedback resistor in a common emitter amplifier than to set and stabilize the gain of the transistor amplifier.

    By the term "stabilize", I mean that the collector feedback resistor minimizes changes in the amplifier's gain due to variations in beta due to temperature as well as variations of beta that occur between different transistors bearing the same part number.

    hgmjr
     
  5. aac

    Active Member

    Jun 13, 2005
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    Collector feedback also lowers the output impedance and input impedance of the amplifier, so it can be used to control these. If you include capacitors or inductors in the feedback circuit, you can also control bandwith. If you include nonlinear elements, you can make things like log, exponential, or multiplier circuits.
     
  6. windoze killa

    AAC Fanatic!

    Feb 23, 2006
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    wow The master of one word questions.
     
  7. paultwang

    Well-Known Member

    Mar 8, 2006
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    Also reduces harmonic distortion a little bit.
     
  8. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    It can also be used for bias stabilization.
     
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