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Introduction
An Operational Amplifier is basically a three-terminal device that consists of two high impedance inputs. Due to its favourable characteristics, it is used for different application in different circuits. In addition, what is an ideal op-amp? Ideal op-amps use no power, have infinite input impedance, unlimited gain-bandwidth and slew rate, no input bias current, and no input offset. They have unlimited voltage compliance.
In electronic circuits, an op-amp can be Non-Inverting Amplifiers, Phase Shifter, Scale Changer, Adder or Summing Amplifier, Differential Amplifier, Differentiator, Integrator, Voltage to Current Converter, Current to Voltage Converter, Logarithmic Amplifier, Half Wave Rectifier, Peak Detector, Voltage Comparator, etc.
For example, an op-amp circuit buffers the sensor and allows gain or attenuation circuits to be developed. The output of the sensor is non-linear. An inverting op-amp circuit gives you a more linear output than a non-inverting op-amp circuit does.
Op-Amp Circuits Diagram
Fig 1. Inverting Amplifier Circuit
Fig 2. Inverting Amplifier Circuit with High Input Impedance
Fig 3. Fast Inverting Amplifier Circuit with High Input Impedance
Fig 4. Non-inverting Amplifier Circuit
Fig 5. Non-inverting AC Amplifier Circuit
Fig 6. Difference Amplifier Circuit
Fig 7. Fast Summing Amplifier Circuit with Low Input Current
Fig 8. Inverting Summing Amplifier Circuit
Fig 9. Non-inverting Summing Amplifier Circuit
Fig 10. Op-amp as Fast Integrator
Fig 11. As Current to Voltage Converter
Fig 12. As Fast Zero Crossing Detector
Fig 13. As Low Drift Peak Detector
Fig 14. Offset Voltage Adjustment Circuit for Voltage Followers
Fig 15. As Low-Frequency Sine Wave Generator with Quadrature Output
Fig 16. Precision Current Source Using OP Amp
Fig 17. Precision Clamp Circuit Using Op-Amp
Fig 18. As Negative Capacitance Multiplier
Fig 19. As Analog Multiplier
Fig 20. As Pulse-width Modulator (PWM)
Fig 21. As High Pass Active Filter
Fig 22. As Low Pass Active Filter
Fig 23. As Photodiode Amplifier
Fig 24. Amplifier Circuit for Piezoelectric Transducer
Fig 25. Current Monitor Amplifier
Golden Rules of Op-Amp
The above list may not be complete. If you are interested, please feel free to leave a message. Operational amplifiers have many functions, different combinations in the circuit will have different effects, but they are golden rules of op-amp circuits:
1) Infinite Open Loop Gain
2) No current flowing through both of the Inputs
3) Potential Difference between input pins is Zero.
Recommended Readings
Operational Amplifier Equations For Circuit Design
Non-Inverting Amplifiers and Inverting Amplifiers
Op Amp High Input Impedance and Low Output Impedance