Which of the following offers highest speed of operation?

Explanation:

Key Features of Depletion Mode MOSFETs:

• High-Speed Operation: Depletion mode MOSFETs have low capacitance and high electron mobility, which allows for faster switching. The smaller parasitic capacitance associated with the gate and drain terminals enables rapid charging and discharging, which is crucial for high-speed applications.
• Normally "On" Operation: Unlike enhancement mode MOSFETs, depletion mode MOSFETs are naturally conductive. This characteristic eliminates the need for additional circuit components to maintain conduction in certain applications, further improving speed and efficiency.
• Low Power Consumption: Due to their high input impedance, depletion mode MOSFETs draw negligible current from the gate terminal, which reduces power losses and enhances overall efficiency.
• Wide Frequency Response: The high-speed switching capability of depletion mode MOSFETs makes them suitable for applications in high-frequency circuits, such as RF amplifiers and communication systems.