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The voltage gain of a common-source JFET amplifier depends up on its
- a)Input impedance
- b)Amplification factor
- c)Dynamic drain resistance
- d)Drain load resistance
Correct answer is option 'D'. Can you explain this answer?
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The voltage gain of a common-source JFET amplifier depends up on itsa)...
Explanation:
A JFET (Junction Field Effect Transistor) is a type of transistor that uses an electric field to control the conductivity of a channel in a semiconductor material. Common-source JFET amplifiers are used in audio and voltage amplifier circuits.
Voltage gain refers to the ratio of output voltage to input voltage in an amplifier circuit. The voltage gain of a common-source JFET amplifier depends on several factors, including:
1. Drain load resistance: The drain load resistance is the resistance connected between the drain of the JFET and the power supply. The higher the value of the drain load resistance, the higher the voltage gain of the amplifier.
2. Input impedance: The input impedance is the resistance seen by the input signal source. The higher the input impedance of the amplifier, the higher the voltage gain.
3. Amplification factor: The amplification factor is the ratio of the change in drain current to the change in gate-source voltage. The higher the amplification factor of the JFET, the higher the voltage gain of the amplifier.
4. Dynamic drain resistance: The dynamic drain resistance is the resistance seen by the drain of the JFET when the gate-source voltage is varied. The higher the dynamic drain resistance, the higher the voltage gain of the amplifier.
Out of the above factors, drain load resistance has the most significant effect on voltage gain, as it directly affects the output voltage of the amplifier. Hence, option D (Drain load resistance) is the correct answer.
A JFET (Junction Field Effect Transistor) is a type of transistor that uses an electric field to control the conductivity of a channel in a semiconductor material. Common-source JFET amplifiers are used in audio and voltage amplifier circuits.
Voltage gain refers to the ratio of output voltage to input voltage in an amplifier circuit. The voltage gain of a common-source JFET amplifier depends on several factors, including:
1. Drain load resistance: The drain load resistance is the resistance connected between the drain of the JFET and the power supply. The higher the value of the drain load resistance, the higher the voltage gain of the amplifier.
2. Input impedance: The input impedance is the resistance seen by the input signal source. The higher the input impedance of the amplifier, the higher the voltage gain.
3. Amplification factor: The amplification factor is the ratio of the change in drain current to the change in gate-source voltage. The higher the amplification factor of the JFET, the higher the voltage gain of the amplifier.
4. Dynamic drain resistance: The dynamic drain resistance is the resistance seen by the drain of the JFET when the gate-source voltage is varied. The higher the dynamic drain resistance, the higher the voltage gain of the amplifier.
Out of the above factors, drain load resistance has the most significant effect on voltage gain, as it directly affects the output voltage of the amplifier. Hence, option D (Drain load resistance) is the correct answer.
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Community Answer
The voltage gain of a common-source JFET amplifier depends up on itsa)...
Common source JFET amplifier:
Voltage gain AV = Vi/Vo = -gm(RD∥RL)
RD∥RL = RDRL/(RD+RL)
Where,
Vi is the input voltage
Vo is the output voltage
gm is the transconductance
RD is drain resistance
RL is the load resistance
As Voltage Gain is proportional to the parallel combination of Drain and Load Resistance,
The voltage gain of common source JFET amplifier depends upon its Drain Load Resistance
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The voltage gain of a common-source JFET amplifier depends up on itsa)Input impedanceb)Amplification factorc)Dynamic drain resistanced)Drain load resistanceCorrect answer is option 'D'. Can you explain this answer?
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