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  7. DIFFERENCE AMPLIFIER OR SUBTRACTOR

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Summary Difference (or differential) amplifiers
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 Difference (or differential) amplifiers are used in various applications where there is a need to amplify the difference between two input signals.  This is a device that amplifies the difference between two inputs but rejects any signals common to the two inputs.

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  • No
  • Amplifiers
  • September 27, 2021
  • 20
  • 2021/2022
  • Summary

Subjects

  • difference amplifier or subtractor
  • basic circuit of differential amplifier
  • the signal is applied in the following two ways
  • single ended input
  • re determines the emitter current of q1 and q2  ie is in

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DIFFERENCE AMPLIFIER OR SUBTRACTOR

 Derive the out put voltage equation :




1

, ctd
 Difference (or differential) amplifiers are used in various
applications where there is a need to amplify the difference
between two input signals.
 This is a device that amplifies the difference between two
inputs but rejects any signals common to the two inputs.
 Considering the op amp circuit shown in Figure above:
 There is no current that passes through the op amp
terminals(i.e Inverting and Non Inverting).Hence the
current is zero at the two terminals, and
 Va = Vb

2

, ctd
 Calculating the voltage at the non inverting terminal using
voltage divider rule:
 When resistors R1 = R3 and R2 = R4
 Vb = [R2 / R1 + R2] V2 ….Using Voltage Divider Rrule

 Hence, Va = Vb = [R2 / R1 + R2] V2. ……………(i)

 Current (I1) : Flowing from V1




 Current (I2) : Through feedback resistor



3

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