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Analog Electronics Operational Amplifier Applications

A logarithmic amplifier commonly uses a diode or transistor junction in its feedback path because the junction has an approximately?

AExponential current-voltage characteristic
BPerfectly linear resistance
CInfinite breakdown voltage
DConstant current independent of voltage

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Correct Answer: A. Exponential current-voltage characteristic

Explanation: The exponential junction law allows an op-amp feedback circuit to produce an output proportional to the logarithm of input current or voltage.

Reference: Standard analog electronics: logarithmic amplifier

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