# Common Operational Amplifier Circuits Analysis with Diagrams

Follow article### 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

## Comments

Add a comment