Design of differential amplifier

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SUMMARY

The discussion focuses on designing a differential amplifier using operational amplifiers (op-amps). The key formula provided is Vo = (R2/R1)(V2 - V1), where R2 and R1 are resistor values that determine the amplifier's gain. The user aims for a gain of 5, leading to the calculation of R2 and R3 as 16.5 kΩ. The challenge presented involves understanding the impact of the inner resistance of V2 and Vo on the circuit design.

PREREQUISITES
  • Understanding of operational amplifier (op-amp) configurations
  • Familiarity with resistor values and gain calculations
  • Knowledge of differential amplifier principles
  • Basic circuit analysis techniques
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  • Research the effect of input and output impedance in op-amp circuits
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Electronics students, circuit designers, and engineers interested in amplifier design and operational amplifier applications.

kasse
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Homework Statement



http://i36.tinypic.com/hugkyb.jpg

Homework Equations



According to my book, if R3 = R2 and R4 = R1, I can use the following formula:

Vo = (R2/R1)(V2 - V1).

The Attempt at a Solution



We want R2/R1 to equal 5. This means that R3 and R2 must be 5*3,3 = 16.5 k(ohms).

However, I don't know what to do with the inner resistance of V2 and Vo. Any suggestions?
 
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For an ideal op-amp, the input current is zero.
 

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