Field Effect Transistors and Their Operations

These flashcards cover key vocabulary terms related to Field Effect Transistors, their operations, characteristics, and biasing techniques.

JFET

Junction Field Effect Transistor, a type of field-effect transistor that uses a junction to create a depletion region.

MOSFET

Metal Oxide Semiconductor Field Effect Transistor, a type of FET that utilizes an insulated gate.

Field Effect Transistor (FET)

A unipolar transistor whose operation depends on an electric field.

Depletion Region

A region within a semiconductor where mobile charge carriers are absent, created by applying a voltage at the gate terminal.

Enhancement Mode MOSFET

A mode in which a channel is induced when a voltage greater than a threshold value is applied.

Drain Current (ID)

The current flowing from the drain to the source in a FET.

Transfer Characteristic

A curve that shows the relationship between the output current and the input voltage of a transistor.

Biasing Circuit

A circuit that provides the necessary DC voltage and current to the transistor for its operation.

Pinch-Off Voltage (Vp)

The voltage at which the channel of a JFET is pinched off, leading to constant current flow.

Gate-Source Voltage (VGS)

The voltage difference between the gate and source terminals of a FET, controlling the channel conductivity.

Self-Biasing

A method of biasing a transistor using feedback from the output to stabilize the operating point.

Voltage Divider Bias

A biasing technique using a voltage divider network to set the gate voltage.

Threshold Voltage (VGS(th))

The minimum gate-source voltage required to create a conductive channel in MOSFET.

Characteristic Curve

A graph displaying the relationship between various parameters such as current and voltage in a transistor.

Parameters of JFET

Important values that characterize the performance of a JFET, like IDSS, Vp, and VGS(off).

Application of FET

FETs are commonly used in amplification, switching, and signal processing circuits.