1 / 8

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.

odeda
Télécharger la présentation

William

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related