COMPUTING

Differential Input Op Amp+v in1−R 1R 2+v in2−+−v inNR NR−+R f+v out−Figure 5.61. Basic non−inverting summing and averaging op amp circuitRV 2R eq−+R f+v out−Figure 5.62. Equivalent circuit for the circuit of Figure 5.61In the circuit of Figure 5.62, the voltage V 2 at the non−inverting input is V 2 = R eq I eqand thusthe output voltage isRv fRout = ⎛ ---- + 1 ⎞ V2 = ⎛ ---- f+ 1 ⎞( Req I⎝ R ⎠ ⎝ R ⎠ eq )5.15 Differential Input Op AmpThe circuit of Figure 5.63 is a differential input op amp.(5.52)+−+−v in2R 1−+R f+v out−v in1 R 2R 3Figure 5.63. Differential input op ampElectronic Devices and Amplifier Circuits with MATLAB Computing, Second EditionCopyright © Orchard Publications5−39