Differential amplifier

Discussion in 'General Electronics Chat' started by Khushi, Oct 13, 2014.

  1. Khushi

    Thread Starter New Member

    Sep 1, 2014
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    Why do we need a positive and a negative supply voltage in a differential amplifier?

    What will happen if the two beta values are different in a differential amplifier?
     
    Last edited by a moderator: Oct 13, 2014
  2. MrChips

    Moderator

    Oct 2, 2009
    14,514
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    Please stay on one thread:
     
  3. Willen

    Member

    Nov 13, 2015
    193
    25
    Now I am resurrecting the thread to know the answer. :)
     
  4. Bordodynov

    Well-Known Member

    May 20, 2015
    1,114
    335
    The Output signal of the differential cascade can and must be as positive, so and negative. This depends on that, where voltage more. On inverting input (the negative output signal) or noninverting input (the positive signal output signal). For positive output signal necessary positive source. For negative output signal necessary negative source.
     
  5. ramancini8

    Active Member

    Jul 18, 2012
    462
    130
    A difference amplifier can be single or dual supply.
     
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