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William

William. Operational Amplifier ( op amp ). Properties of the Ideal op amp Infinite Gain (voltage) Infinite Input Impedance (resistance) Zero Output Impedance Properties of the average op amp : Practically always s9V Output Open loop gain: Ratio: Typically 10 6.

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William

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  1. William

  2. Operational Amplifier (op amp) • Properties of the Ideal op amp • Infinite Gain (voltage) • Infinite Input Impedance (resistance) • Zero Output Impedance • Properties of the average op amp: • Practically always s9V Output • Open loop gain: • Ratio: Typically 106

  3. Drawing Circuit Diagrams • Inverting Amplifiers • Negative potential is higher than Positive Potential • Non-Inverting Amplifiers • Positive potential is higher than Negative a

  4. Derivation of Non-Inverting op amp gain • If the difference between the two voltages is more than 9microV, than output is constant 9V • Very small difference, just say: = • Apply Ohm’s Law: = I • Apply Ohms Law to only because input impedance is infinite: = I • Gain : =  = = 1 +

  5. Derivation of Inverting op amp gain • If the difference between the two voltages is more than 9microV, than output is constant 9V • Very small difference, just say: = • Apply Ohm’s Law: = I • Apply Ohm’s Law: = I • Gain : I = =  =

  6. Use of op amps as COMPARATORS • Comparators Compare …. Two potentials • Higher Positive potential makes output voltage +9V. • Higher Negative potential makes output voltage -9V. • Possible uses: FIRE ALARMS

  7. Schmitt Trigger • Has two thresholds: upper and lower • V-output is switched to a higher/lower value once these threshold V-input is reached. • Reshapes Digital signals, Removes Noise: Hysteresis: Comparator remembers what its previous state was. Voltages between thresholds if going down +9V, if going up -9V

  8. Problems

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