Draw a transistor level two input NAND gate. Explain its sizing (a) considering Vth (b) for equal rise and fall times
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Answer / Rajkamal Singh
Answer: A 2-input NAND gate at the transistor level is built using two PMOS and two NMOS transistors. Here's its diagram:nn```plaintextn +-----+ +-----+ +n 1 | |-----| In |-------| Out |n +-----+ +-----+ +n +-----+ +n | NMOS|n +-----+ +n | PMOS|n```n(a) To optimize for Vth, both PMOS and NMOS transistors can be sized to have similar threshold voltages (Vth). This ensures that both types of transistors turn on at approximately the same gate voltage, reducing signal delay and improving overall circuit performance.nn(b) For equal rise and fall times, the PMOS and NMOS transistors should be matched in terms of their channel lengths. Shorter channels will result in faster rise times (due to higher current drive), while longer channels will lead to slower fall times (due to lower current drive). To achieve equal rise and fall times, the channel lengths of both types of transistors can be adjusted accordingly.
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