Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > In CMOS implementation of a NAND gate:a)All t...
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In CMOS implementation of a NAND gate:
- a)All the PMOS and NMOS are in series
- b)The two PMOS are in parallel and two NMOS are in series
- c)All the PMOS and NMOS are in parallel
- d)The two PMOS are in series and two NMOS are in parallel
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
In CMOS implementation of a NAND gate:a)All the PMOS and NMOS are in s...
Understanding CMOS NAND Gate Implementation
In a CMOS (Complementary Metal-Oxide-Semiconductor) NAND gate, the arrangement of PMOS and NMOS transistors is crucial for its functionality. Let's explore why option 'B' is the correct answer.
Configuration of PMOS and NMOS
- PMOS Transistors: In a NAND gate, two PMOS transistors are connected in parallel. This configuration allows for the output to be pulled high when at least one of the inputs is low.
- NMOS Transistors: Conversely, the two NMOS transistors are connected in series. This means that both NMOS transistors must be turned on for the output to be pulled low. This series connection ensures that the output is only low when both inputs are high.
Operation of the NAND Gate
- Input Low: If either input is low, at least one PMOS turns on, pulling the output high.
- Input High: If both inputs are high, both NMOS transistors turn on, connecting the output to ground and pulling it low.
Key Takeaways
- The arrangement of PMOS in parallel allows flexibility in switching to high, while NMOS in series ensures the output is low only under specific conditions.
- This complementary behavior of PMOS and NMOS is what gives the NAND gate its desired logic function.
In summary, the CMOS implementation of a NAND gate involves two PMOS transistors in parallel and two NMOS transistors in series, confirming that option 'B' is indeed correct. This design is efficient and plays a critical role in digital circuits.
In a CMOS (Complementary Metal-Oxide-Semiconductor) NAND gate, the arrangement of PMOS and NMOS transistors is crucial for its functionality. Let's explore why option 'B' is the correct answer.
Configuration of PMOS and NMOS
- PMOS Transistors: In a NAND gate, two PMOS transistors are connected in parallel. This configuration allows for the output to be pulled high when at least one of the inputs is low.
- NMOS Transistors: Conversely, the two NMOS transistors are connected in series. This means that both NMOS transistors must be turned on for the output to be pulled low. This series connection ensures that the output is only low when both inputs are high.
Operation of the NAND Gate
- Input Low: If either input is low, at least one PMOS turns on, pulling the output high.
- Input High: If both inputs are high, both NMOS transistors turn on, connecting the output to ground and pulling it low.
Key Takeaways
- The arrangement of PMOS in parallel allows flexibility in switching to high, while NMOS in series ensures the output is low only under specific conditions.
- This complementary behavior of PMOS and NMOS is what gives the NAND gate its desired logic function.
In summary, the CMOS implementation of a NAND gate involves two PMOS transistors in parallel and two NMOS transistors in series, confirming that option 'B' is indeed correct. This design is efficient and plays a critical role in digital circuits.
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Community Answer
In CMOS implementation of a NAND gate:a)All the PMOS and NMOS are in s...
CMOS is a combination of NMOS & PMOS.
NAND gate can be implemented using two PMOS in parallel and two NMOS in series as shown:
NAND gate can be implemented using two PMOS in parallel and two NMOS in series as shown:
Observations:
- When VA & VB are high at +VDD (5V), then the PMOS will be open-circuited and two NMOS will be short-circuited, the output will be short-circuited to ground and produces a Zero (0V) output.
- When any of the input is low (0 V), the corresponding PMOS will be shorted and NMOS will be open, the output is shorted to VDD, i.e. it produces a high output.
NAND Gate:
It is the combination of AND Gate followed by NOT Gate.
When the two inputs A and B are high, then output y is low, otherwise, it is high.
When the two inputs A and B are high, then output y is low, otherwise, it is high.
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In CMOS implementation of a NAND gate:a)All the PMOS and NMOS are in seriesb)The two PMOS are in parallel and two NMOS are in seriesc)All the PMOS and NMOS are in paralleld)The two PMOS are in series and two NMOS are in parallelCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In CMOS implementation of a NAND gate:a)All the PMOS and NMOS are in seriesb)The two PMOS are in parallel and two NMOS are in seriesc)All the PMOS and NMOS are in paralleld)The two PMOS are in series and two NMOS are in parallelCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In CMOS implementation of a NAND gate:a)All the PMOS and NMOS are in seriesb)The two PMOS are in parallel and two NMOS are in seriesc)All the PMOS and NMOS are in paralleld)The two PMOS are in series and two NMOS are in parallelCorrect answer is option 'B'. Can you explain this answer?.
In CMOS implementation of a NAND gate:a)All the PMOS and NMOS are in seriesb)The two PMOS are in parallel and two NMOS are in seriesc)All the PMOS and NMOS are in paralleld)The two PMOS are in series and two NMOS are in parallelCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In CMOS implementation of a NAND gate:a)All the PMOS and NMOS are in seriesb)The two PMOS are in parallel and two NMOS are in seriesc)All the PMOS and NMOS are in paralleld)The two PMOS are in series and two NMOS are in parallelCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In CMOS implementation of a NAND gate:a)All the PMOS and NMOS are in seriesb)The two PMOS are in parallel and two NMOS are in seriesc)All the PMOS and NMOS are in paralleld)The two PMOS are in series and two NMOS are in parallelCorrect answer is option 'B'. Can you explain this answer?.
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