In which of following region of MOSFET the drain to source current becomes constant?Asaturation regionBcut off regionCohmic regionSubmit Answer

Step 1: Break Down the Problem

To determine in which region of a MOSFET the drain-to-source current becomes constant, we need to examine the characteristics of the different regions of a MOSFET.

Step 2: Relevant Concepts

The three regions mentioned are:

1. Saturation Region: In this region, the drain current (I_D) becomes primarily dependent on the gate-source voltage (V_GS) and is almost constant for various drain-source voltages (V_DS).
2. Cut-off Region: Here, the MOSFET is turned off, and there is no drain current (I_D = 0).
3. Ohmic Region (or Triode Region): In this region, the MOSFET behaves like a variable resistor, and the drain current (I_D) is linearly proportional to the drain-source voltage (V_DS).

Step 3: Analysis and Detail

• In the saturation region, as the drain-source voltage (V_DS) increases past the saturation voltage (V_DS > V_DS(sat)), the drain current approximately becomes constant and is primarily controlled by the gate-source voltage (V_GS).
• In the cut-off region, the device is off, so there is no current flow.
• In the ohmic region, the current is not constant; it increases with V_DS.

Step 4: Verify and Summarize

After examining the characteristics of each region, we conclude that the drain-to-source current becomes constant specifically in the saturation region.

Final Answer

The correct answer is: A. Saturation Region.