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The action of a JFET in its equivalent circuit can best be represented as a
- a)Current Controlled Current source
- b)Current Controlled Voltage Source
- c)Voltage Controlled Voltage source
- d)Voltage Controlled Current Source
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The action of a JFET in its equivalent circuit can best be represented...
The magnitude of the current flowing through the channel between the Drain and the Source terminals is controlled by a voltage applied to the Gate terminal, which is a reverse-biased. In an N-channel JFET this Gate voltage is negative while for a P-channel JFET the Gate voltage is positive.
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The action of a JFET in its equivalent circuit can best be represented...
The JFET Action Explained
The Junction Field Effect Transistor (JFET) operates primarily as a voltage-controlled device. Its equivalent circuit representation is crucial for understanding its functionality.
Voltage Controlled Current Source
- The JFET uses a voltage applied to its gate terminal to control the current flowing through its drain-source channel.
- The gate-source voltage (Vgs) influences the conductivity of the channel, making it a voltage-controlled device.
Current Flow Mechanism
- When a negative voltage is applied to the gate (for an n-channel JFET), it repels charge carriers (electrons), reducing the channel's conductivity.
- Conversely, a zero or positive voltage increases the channel’s conductivity, allowing more current to flow from the drain to the source.
Comparison with Other Sources
- Current Controlled Current Source: This would imply that output current is controlled by input current, which is not the case in JFETs.
- Current Controlled Voltage Source: Does not apply, as JFET operation relies on voltage to control current, not vice versa.
- Voltage Controlled Voltage Source: While JFET gates respond to voltage, the output current is not directly linked to an output voltage in this manner.
Conclusion
- In summary, the JFET acts as a Voltage Controlled Current Source because the gate voltage controls the amount of drain current flowing through the device.
- This characteristic is fundamental to its applications in amplification and switching circuits.
The Junction Field Effect Transistor (JFET) operates primarily as a voltage-controlled device. Its equivalent circuit representation is crucial for understanding its functionality.
Voltage Controlled Current Source
- The JFET uses a voltage applied to its gate terminal to control the current flowing through its drain-source channel.
- The gate-source voltage (Vgs) influences the conductivity of the channel, making it a voltage-controlled device.
Current Flow Mechanism
- When a negative voltage is applied to the gate (for an n-channel JFET), it repels charge carriers (electrons), reducing the channel's conductivity.
- Conversely, a zero or positive voltage increases the channel’s conductivity, allowing more current to flow from the drain to the source.
Comparison with Other Sources
- Current Controlled Current Source: This would imply that output current is controlled by input current, which is not the case in JFETs.
- Current Controlled Voltage Source: Does not apply, as JFET operation relies on voltage to control current, not vice versa.
- Voltage Controlled Voltage Source: While JFET gates respond to voltage, the output current is not directly linked to an output voltage in this manner.
Conclusion
- In summary, the JFET acts as a Voltage Controlled Current Source because the gate voltage controls the amount of drain current flowing through the device.
- This characteristic is fundamental to its applications in amplification and switching circuits.
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