Topic: Electronic Devices and Circuits
The dynamic resistance of diode varies as
- A. $1/I^{2}$
- B. $1/I$
- C. $I$
- D. $I^{2}$
Answer: B. $1/I$
Explanation: The dynamic resistance of the diode is given as $r_{d}=\frac{V_{T}}{I_{DC}}$, where $V_{T}=\frac{kT}{q}$ is the thermal voltage and $I_{DC}$ is the DC current flowing through the diode. Therefore, $r_{d} \propto \frac{1}{I_{DC}}$.