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Common Operational Amplifier Circuits Analysis with Diagrams

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

Inverting Amplifier Circuit

Fig 1. Inverting Amplifier Circuit

Inverting Amplifier Circuit with High Input Impedance

Fig 2. Inverting Amplifier Circuit with High Input Impedance

Fast Inverting Amplifier Circuit with High Input Impedance

Fig 3. Fast Inverting Amplifier Circuit with High Input Impedance

Non-inverting Amplifier Circuit

Fig 4. Non-inverting Amplifier Circuit

Non-inverting AC Amplifier Circuit

Fig 5. Non-inverting AC Amplifier Circuit

Difference Amplifier Circuit

Fig 6. Difference Amplifier Circuit

Fast Summing Amplifier Circuit with Low Input Current

Fig 7. Fast Summing Amplifier Circuit with Low Input Current

Inverting Summing Amplifier Circuit

Fig 8. Inverting Summing Amplifier Circuit

on-inverting Summing Amplifier Circuit

Fig 9. Non-inverting Summing Amplifier Circuit

Op-amp as Fast Integrator

Fig 10. Op-amp as Fast Integrator

Current to Voltage Converter

Fig 11. As Current to Voltage Converter

Fast Zero Crossing Detector

Fig 12. As Fast Zero Crossing Detector

Low Drift Peak Detector

Fig 13. As Low Drift Peak Detector

Offset Voltage Adjustment Circuit for Voltage Followers

Fig 14. Offset Voltage Adjustment Circuit for Voltage Followers

Low-Frequency Sine Wave Generator with Quadrature Output

Fig 15. As Low-Frequency Sine Wave Generator with Quadrature Output

Precision Current Source Using OP Amp

Fig 16. Precision Current Source Using OP Amp

Precision Clamp Circuit Using Op-Amp

Fig 17. Precision Clamp Circuit Using Op-Amp

Negative Capacitance Multiplier

Fig 18. As Negative Capacitance Multiplier

Analog Multiplier

Fig 19. As Analog Multiplier

Pulse-width Modulator (PWM)

Fig 20. As Pulse-width Modulator (PWM)

High Pass Active Filter

Fig 21. As High Pass Active Filter

Low Pass Active Filter

Fig 22. As Low Pass Active Filter

Photodiode Amplifier

Fig 23. As Photodiode Amplifier

Amplifier Circuit for Piezoelectric Transducer

Fig 24. Amplifier Circuit for Piezoelectric Transducer

Current Monitor Amplifier

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

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