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Differential amplifier ac

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Diffrential Amplifier using 3 opamps

Publié dans : Ingénierie
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Differential amplifier ac

  1. 1. Differential Amplifier Using Three Op-Amps Prepared by : 73. Rajat Shukla
  2. 2. Features Of Differential Amplifier with Three Op-Amps • Very high input resistance • Variable Voltage Gain The advantages of the two differential amplifiers just discussed can be combined in a single differential amplifier having variable voltage gain and very high input resistance. However, to achieve this desirable combination, three op-amps must be used Need of Differential Amplifier with Three Op-Amps
  3. 3. Circuit Diagram :
  4. 4. Voltage Gain : Input Resistance :
  5. 5. Output Resistance : where Ad = closed-loop gain of the differential amplifier Ro = output resistance of the op-amp A = open-loop voltage gain of the op-amp Remember that Ad is different for each of the differential amplifier configurations.
  6. 6. Bandwidth : As in the case of non inverting and inverting amplifiers, the bandwidth of differential amplifiers also depends on the closed- loop gain of the amplifier and is given by : where fo is the open-loop break frequency of the op- amp.
  7. 7. Thank You !

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