JFET Operation and Characteristics Quiz

What is the symbol for a JFET?

• D

• B

• A

• C

How is the structure of a JFET different from a MOSFET?

• The channel in a MOSFET is formed by a reverse-biased PN junction

• The channel in a JFET is formed by a reverse-biased PN junction, while the channel in a MOSFET is formed by a voltage-controlled insulated gate.

• The structure of a JFET is the same as a MOSFET

• The channel in a JFET is formed by a forward-biased PN junction

In depletion mode, how does the JFET behave when the gate-source voltage is zero?

• Variable resistor

• Normally closed switch

• Capacitor

• Normally open switch

Explain the operation of a JFET in enhancement mode.

• The JFET is always on regardless of the gate-source voltage

• The JFET is normally off when the gate-source voltage (VGS) is zero, and turns on when a voltage is applied to the gate.

• The JFET turns on when the gate-source voltage is zero

• The JFET turns off when a voltage is applied to the gate

What is the relationship between drain current (ID) and drain-source voltage (VDS) in a JFET?

• ID is not affected by VDS

• ID decreases as VDS increases

• ID increases as VDS increases

• ID is relatively constant

What is the small-signal model of a JFET?

• Voltage-controlled current source

• Resistance-controlled current source

• Current-controlled voltage source

• Voltage-controlled voltage source