Question

MOSFET can be used as a
(A) current controlled capacitor
(B) voltage controlled capacitor
(C) current controlled inductor
(D) voltage controlled inductor

Answer 1

option B is the correct answer

voltage controlled capacitor

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Answer 2

Answer:

The MOSFET is found to be used as a efficient voltage controlled capacitor thus, option (B) is the correct choice.

Explanation:

• MOSFET is an abbreviation for Metal Oxide Semiconductor Field Effect Transistor. This is also called an IGFET and means an isolated gate field effect transistor. FETs operate in both depletion and enhancement modes.

• The structure of the MOSFET is somewhat similar to the FET. An oxide layer is deposited on the board to which the gate terminals are connected. The name of the MOSFET is different from that of the IGFET because this oxide layer acts as an insulator ($SiO_2$ is separated from the substrate). When constructing a MOSFET, a low-concentration-doped substrate is diffused in the high-concentration-doped region.

• In MOSFETs, the gate and channel are separated by a very thin layer of $SiO$, producing a capacitance that changes with the gate voltage.  The MOSFET acts like a MOS capacitor and  is controlled by the input gate-source voltage.
  In other words, it works like a voltage-controlled variable capacitor.

Therefore, the MOSFET can be used as a voltage control capacitor.

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