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7 of 18 articles

Difference Amplifier

Differential input, CMRR improvement, bridge amplifier.

Mohith N
Updated: 19 March 2026
4 min read

Difference Amplifier Design

Analyze CMRR and difference amplifier topologies.

Question 1 of 3

Q1.What is the primary consequence of a slight mismatch in the resistor ratios of a basic one-op-amp difference amplifier?

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Non-Inverting Amplifier

Gain = 1 + Rf/Ri, high input impedance.

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Inverting Amplifier

Gain = -Rf/Ri, virtual ground, input impedance = Ri.

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Differential Amplifier

Difference and common mode gain, CMRR, tail current source.

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Log and Antilog Amplifier

Logarithmic compression, exponential expansion circuits.

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Ideal Op-Amp

Infinite gain, infinite input impedance, zero output impedance.

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Instrumentation Amplifier