GATE Questions & Answers of Single-stage BJT and MOSFET Amplifiers: Biasing, Bias Stability, Mid-Frequency Small Signal Analysis and Frequency Response

What is the Weightage of Single-stage BJT and MOSFET Amplifiers: Biasing, Bias Stability, Mid-Frequency Small Signal Analysis and Frequency Response in GATE Exam?

Total 2 Questions have been asked from Single-stage BJT and MOSFET Amplifiers: Biasing, Bias Stability, Mid-Frequency Small Signal Analysis and Frequency Response topic of Analog Circuits subject in previous GATE papers. Average marks 1.50.

Which one of the following statements is correct about an ac-coupled common-emitter amplifier operating in the mid-band region?
 

The ac schematic of an NMOS common-source stage is shown in the figure below, where part of the biasing circuits has been omitted for simplicity. For the n -channel MOSFET M, the transconductance gm = 1 mA/V, and body effect and channel length modulation effect are to be neglected. The lower cutoff frequency in Hz of the circuit is approximately at