Op-amp Varieties

Operational amplifiers are very versatile electronic devices. This is a sampling of the kinds of devices which can be created with a single op-amp.

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Inverting amplifier
Non-inverting amplifier
Voltage follower
Current-to-voltage amp
Voltage-to-current amp
Precision diode
Integrator
Differentiator
Summing amplifier
Difference amplifier
Differential amplifier
Comparator
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Inverting Amplifier

For an ideal op-amp, the inverting amplifier gain is given simply by

For equal resistors, it has a gain of -1, and is used in digital circuits as an inverting buffer.

Rules application

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Inverting amplifier
Non-inverting amplifier
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Non-inverting Amplifier

For an ideal op-amp, the non-inverting amplifier gain is given by

Rules application

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Inverting amplifier
Non-inverting amplifier
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Rules:Inverting Amplifier

The behavior of most configurations of op-amps can be determined by applying the "golden rules". For an inverting amplifier, the current rule tries to drive the current to zero at point A. This requires:

This gives the voltage amplification


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Rules:Non-inverting Amplifier

The behavior of most configurations of op-amps can be determined by applying the "golden rules". For an non-inverting amplifier, the current rule tries to drive the current to zero at point A and the voltage rule makes the voltage at A equal to the input voltage. This leads to

and amplification

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