Q. In the circuit shown below, the input voltage ๐๐๐ is positive. The current (๐ผ) – voltage (๐) characteristics of the diode can be assumed to be ๐ผ = ๐ผ0๐๐/๐๐ under the forward bias condition, where ๐๐ is the thermal voltage and ๐ผ0 is the reverse saturation current. Assuming an ideal op-amp, the output voltage ๐๐๐ข๐ก of the circuit is proportional to
Ans: ๐๐๐๐/๐๐
Sol:
By applying KCL at node O,
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