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For NMOS transistor which of the following is not true?
- a)The substrate is of p-type semiconductor
- b)Inversion layer or induced channel is of n type
- c)Threshold voltage is negative
- d)None of the mentioned
Correct answer is option 'C'. Can you explain this answer?
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For NMOS transistor which of the following is not true?a)The substrate...
The Answer
The statement that is not true for an NMOS transistor is option 'C', which states that the threshold voltage is negative.
Explanation
To understand why this statement is incorrect, let's first have a brief overview of an NMOS transistor.
1. NMOS Transistor Basics
NMOS (N-channel metal-oxide-semiconductor) transistor is a type of field-effect transistor (FET) that uses an n-type channel to conduct current. It consists of three terminals - the source (S), drain (D), and gate (G). The substrate is typically made of p-type semiconductor material.
2. Operation of NMOS Transistor
When a positive voltage is applied to the gate terminal, it creates an electric field that attracts free electrons from the n-type region towards the oxide layer. This results in the formation of an inversion layer or an induced channel of n-type semiconductor material between the source and drain regions.
3. Threshold Voltage (Vth)
The threshold voltage (Vth) is the minimum voltage required at the gate terminal to create the inversion layer and allow current flow between the source and drain regions. It is an important parameter that determines the on/off behavior of the transistor.
4. Sign of Threshold Voltage (Vth)
The threshold voltage (Vth) of an NMOS transistor is typically positive and not negative. The positive threshold voltage ensures that the transistor remains off when the gate voltage is below a certain value. When the gate voltage exceeds the threshold voltage, the transistor turns on and allows current to flow between the source and drain.
Conclusion
In summary, the statement that the threshold voltage of an NMOS transistor is negative is incorrect. The threshold voltage is typically positive, and it determines the minimum voltage required to turn on the transistor.
The statement that is not true for an NMOS transistor is option 'C', which states that the threshold voltage is negative.
Explanation
To understand why this statement is incorrect, let's first have a brief overview of an NMOS transistor.
1. NMOS Transistor Basics
NMOS (N-channel metal-oxide-semiconductor) transistor is a type of field-effect transistor (FET) that uses an n-type channel to conduct current. It consists of three terminals - the source (S), drain (D), and gate (G). The substrate is typically made of p-type semiconductor material.
2. Operation of NMOS Transistor
When a positive voltage is applied to the gate terminal, it creates an electric field that attracts free electrons from the n-type region towards the oxide layer. This results in the formation of an inversion layer or an induced channel of n-type semiconductor material between the source and drain regions.
3. Threshold Voltage (Vth)
The threshold voltage (Vth) is the minimum voltage required at the gate terminal to create the inversion layer and allow current flow between the source and drain regions. It is an important parameter that determines the on/off behavior of the transistor.
4. Sign of Threshold Voltage (Vth)
The threshold voltage (Vth) of an NMOS transistor is typically positive and not negative. The positive threshold voltage ensures that the transistor remains off when the gate voltage is below a certain value. When the gate voltage exceeds the threshold voltage, the transistor turns on and allows current to flow between the source and drain.
Conclusion
In summary, the statement that the threshold voltage of an NMOS transistor is negative is incorrect. The threshold voltage is typically positive, and it determines the minimum voltage required to turn on the transistor.
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Community Answer
For NMOS transistor which of the following is not true?a)The substrate...
The threshold voltage is positive for NMOS.
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For NMOS transistor which of the following is not true?a)The substrate is of p-type semiconductorb)Inversion layer or induced channel is of n typec)Threshold voltage is negatived)None of the mentionedCorrect answer is option 'C'. Can you explain this answer?
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