For an RC coupled common source JFET amplifier without bypass capacitor, find the voltage gain if gm = 1mΩ-1, source resistance is 2kΩ, drain resistance is 15kΩ and load is 10kΩ.

Consider the following statements regarding n-channel JFET: 1. The maximum drain current IDSS occurs when gate-to-source voltage VGS = 0 V and drain-to-source voltage VDS ≥ |VP|. (VP is pinch-off voltage). 2. For gate-to-source voltage VGS less than the pinch-off level, the drain current is 0 A. 3. For all levels of VGS between 0 V and the pinch-off level, the current ID will range between IDSS and 0 A, respectively. which of the above statements are correct ?

A

1 and 2 only

B

1 and 3 only

C

1, 2 and 3

D

2 and 3 only

Consider the following statements regarding JFET: 1. The relationship between the drain current and gate-to-source voltage of a JFET is a nonlinear. 2. The minimum current for JFET occurs at pinch-off voltage defined by VGS = VP. 3. A current controlled device is one in which a current defines the operating conditions of the device. Which of the above statements are correct?

A

1 and 2 only

B

1 and 3 only

C

1, 2 and 3

D

2 and 3 only

Calculate the overall voltage gain Gv of a common source amplifier for which gm = 2mA/V, RD = 10 kΩ, R0 = 10 kΩ and RG = 10 MΩ. The amplifier is fed from a signal source of Thevenin resistance of 0.5MΩ and the amplifier is coupled with a load of 10 kΩ.

A

-11.2 V/V

B

-22.4 V/V

C

-33.6 V/V

D

-44.8 V/V

Given collector resistance = 2kΩ, load resistance = 5kΩ, collector capacitance = 1μF, emitter capacitance = 20μF, collector current = 2mA, source resistance = 2kΩ. If the effect of blocking capacitor is ignored, find the applicable cut-off frequency.

A

22.73 Hz

B

612 Hz

C

673Hz

D

317 Hz

Which of these is false for a CS amplifier without a bypass capacitor compared to a CS amplifier with a bypass capacitor?

A

Voltage gain magnitude decreases

B

Input resistance remains same

C

The output resistance decreases

D

The output is 180° out of phase with respect to the input applied

A certain common-source JFET has a voltage gain of 10. If the source bypass capacitor is removed, _____________

A

the voltage gain will increase

B

transconductance will increase

C

voltage gain will decrease

D

the Q-point will shift

A certain common source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ___________

A

the voltage gain will increase

B

the transconductance will increase

C

the voltage gain will decrease

D

the Q-point will shift

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gm.

A

1 A/V

B

10 A/V

C

100 A/V

D

1000 A/V

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Av.

A

9.09 V/V

B

10 V/V

C

90.9 V/V

D

100 V/V

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gvo.

A

53.3 V/V

B

63.3 V/V

C

73.3 V/V

D

83.3 V/V

For an RC coupled common source JFET amplifier without bypass capacitor, find the voltage gain if gm = 1mΩ-1, source resistance is 2kΩ, drain resistance is 15kΩ and load is 10kΩ.

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