difference between opamp & differential amplifier?

Discussion in 'General Electronics Chat' started by swty_todd, Mar 3, 2009.

  1. swty_todd

    Thread Starter Active Member

    Aug 3, 2008
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    what is the difference between opamp & differential amplifier?
     
  2. Wendy

    Moderator

    Mar 24, 2008
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    They are very similar, differential amplifier is a subset of op amps.

    Basically a differential amplifier has two outputs, whose difference is the gain of the + and - inputs.
     
  3. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    It's more in the application than the device itself. Most op-amps can be used as differential amps, but often aren't.

    eric
     
  4. Terp

    Active Member

    Jun 6, 2008
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    http://en.wikipedia.org/wiki/Differential_amplifier

    Differential amplification is one of the many applications of OpAmps like KL7AJ just pointed out. The use of OpAmps used in this way might be to reduce the noise in your application. You know, the input takes the difference between two signals and "rejects" the common mode gain which could be noise due to various sources.

    Hope that helps.
     
  5. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    A differential amplifier may have only one output, wherein the output is the amplified difference between the two inputs. A fully differential amplifier has two outputs.
     
  6. italo

    New Member

    Nov 20, 2005
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    Differential amplifier is referred as two input whereby the difference in input is amplified as opposed to a single ended amplifier where one input is signal the other is common. Differential amplifier can and will amplify the difference between two high common mode signal.
     
  7. paula.arcega

    New Member

    Mar 4, 2009
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    an op-amp can be configured as a diff-amp, however, today we have already diff-amp devices on the market, so no need to reconfigure your simple op-amps to be diff-amps.
     
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