![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](https://www.gkseries.com/blog/wp-content/uploads/2023/08/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.jpg)
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
![](https://www.gkseries.com/blog/wp-content/uploads/2023/08/image-24.png)
Ans: ๐๐๐๐/๐๐
Sol:
![](https://www.gkseries.com/blog/wp-content/uploads/2023/08/image-25.png)
By applying KCL at node O,
![](https://www.gkseries.com/blog/wp-content/uploads/2023/08/image-29.png)