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The common source JFET amplifier has
- a)a very high input impedance and a relatively low voltage gain.
- b)a high input impedance and a very high voltage gain.
- c)a low input impedance and a voltage gain less than 1.
- d)none of the above.
Correct answer is option 'A'. Can you explain this answer?
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The common source JFET amplifier hasa)a very high input impedance and ...
Common Source JFET Amplifier
The common source JFET amplifier is a type of amplifier that uses a JFET (junction field-effect transistor) as its active device. It is a voltage amplifier, which means that it amplifies the voltage level of the input signal. The amplifier is called common source because the source terminal of the JFET is connected to the ground and the input signal is applied to the gate terminal.
Input Impedance
The input impedance of an amplifier is the impedance seen by the signal source that is connected to the amplifier's input. The common source JFET amplifier has a very high input impedance, which means that it draws very little current from the signal source. The input impedance is mainly determined by the resistance of the gate terminal of the JFET, which is very high.
Voltage Gain
The voltage gain of an amplifier is the ratio of the output voltage to the input voltage. The common source JFET amplifier has a relatively low voltage gain compared to other types of amplifiers. The voltage gain is mainly determined by the transconductance of the JFET, which is the ratio of the change in the output current to the change in the input voltage. The transconductance of a JFET is typically in the range of 1 to 10 millisiemens (mS).
Conclusion
In conclusion, the common source JFET amplifier has a very high input impedance and a relatively low voltage gain. The high input impedance makes it suitable for use in applications where the signal source has a high output impedance, such as in microphones and guitar pickups. The low voltage gain makes it suitable for use in applications where a relatively small voltage amplification is required, such as in preamplifiers and tone control circuits.
The common source JFET amplifier is a type of amplifier that uses a JFET (junction field-effect transistor) as its active device. It is a voltage amplifier, which means that it amplifies the voltage level of the input signal. The amplifier is called common source because the source terminal of the JFET is connected to the ground and the input signal is applied to the gate terminal.
Input Impedance
The input impedance of an amplifier is the impedance seen by the signal source that is connected to the amplifier's input. The common source JFET amplifier has a very high input impedance, which means that it draws very little current from the signal source. The input impedance is mainly determined by the resistance of the gate terminal of the JFET, which is very high.
Voltage Gain
The voltage gain of an amplifier is the ratio of the output voltage to the input voltage. The common source JFET amplifier has a relatively low voltage gain compared to other types of amplifiers. The voltage gain is mainly determined by the transconductance of the JFET, which is the ratio of the change in the output current to the change in the input voltage. The transconductance of a JFET is typically in the range of 1 to 10 millisiemens (mS).
Conclusion
In conclusion, the common source JFET amplifier has a very high input impedance and a relatively low voltage gain. The high input impedance makes it suitable for use in applications where the signal source has a high output impedance, such as in microphones and guitar pickups. The low voltage gain makes it suitable for use in applications where a relatively small voltage amplification is required, such as in preamplifiers and tone control circuits.
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The common source JFET amplifier hasa)a very high input impedance and a relatively low voltage gain.b)a high input impedance and a very high voltage gain.c)a low input impedance and a voltage gain less than 1.d)none of the above.Correct answer is option 'A'. Can you explain this answer?
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