Physics · Electronics
In an op-amp log amplifier circuit where a diode is placed in the feedback loop, the input voltage Vin is positive. The current (I)-voltage (V) characteristics of the diode under the forward bias condition is given by I = I0eV / VT, where VT is the thermal voltage and I0 is the reverse saturation current. Assuming an ideal op-amp, the output voltage Vout of the circuit is proportional to:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1loge(Vin / I0R)✓
- 22 Vin
- 3eVin / VT
- 4Vin2
Correct answer
loge(Vin / I0R)
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