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In a differential amplifier, what is the output voltage equation?

Practice Questions

Q1
In a differential amplifier, what is the output voltage equation?
  1. Vout = (V2 - V1)(Rf/Rin)
  2. Vout = V1 - V2
  3. Vout = (V1 + V2)/2
  4. Vout = V1 + V2

Questions & Step-by-Step Solutions

In a differential amplifier, what is the output voltage equation?
  • Step 1: Understand that a differential amplifier takes two input voltages, V1 and V2.
  • Step 2: Recognize that the output voltage (Vout) depends on the difference between these two input voltages.
  • Step 3: Identify that the formula for the output voltage is Vout = (V2 - V1) multiplied by a gain factor.
  • Step 4: The gain factor is determined by the resistors in the circuit, specifically Rf (feedback resistor) and Rin (input resistor).
  • Step 5: Combine these ideas into the final equation: Vout = (V2 - V1)(Rf/Rin).
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