Topic: Analog Circuits
In a common source amplifier using an NMOS transistor, what is the impact of increasing the channel length modulation parameter ($\lambda$)?
- A. Output resistance increases
- B. Gain increases
- C. Output resistance decreases
- D. There is no change in output characteristics
Answer: C. Output resistance decreases
Explanation: The output resistance of a MOSFET is inversely proportional to the channel length modulation parameter, given by $r_0 = \frac{1}{\lambda I_D}$. Therefore, increasing the channel length modulation parameter $\lambda$ will decrease the output resistance $r_0$, which in turn reduces the overall voltage gain of the amplifier.