CMOS gate: b) When input v, is low while input v is high, select one of the foll

Question

CMOS gate: b) When input v, is low while input v is high, select one of the following statements: 1) and Q are off, while a and a, are on 2) a and Q are on, while Q and Q are off 3) a1 and Q, are off, while a, and a are on 4) a1 and a are on, while Q, and Q, are off 5) and a are off, while Q, and a, are on 6 and are on, while a2 and Q are off The objective of this question is to investigate the operation of the four MOSFETs for all combinations of the inputs, v, and v and to deduce the type of the gate c) When input vi is high while input v is low, select one of the following statements: 1) The drain-source voltages (magnitudes) of a and a are low, while the drain-source voltages magnitudes) of Q3 and are high 2) The drain-source voltages (magnitudes) of Q, and Q are high, while the drain-source voltages [magnitudes) of Q and a are low 3) The drain-source voltages (magnitudes) of and Q are low, while the drain-source voltages magnitudes) of Q and a are high 4) The drain-source voltages (magnitudes) of Q, and a, are high, while the drain-source voltages (magnitudes) of Q and e low 5) The drain-source voltages (magnitudes) of Q, and Q, are low, while the drain-source voltages [magnitudes) of Q and Q, are high 6) The drain-source voltages (magnitudes) of a, and Q are high, while the drain-source voltages magnitudes) of Q and Qs are low out d) When the two inputs, v, and v, are both high, select one of the following statements: 1 a and Q are off, while a, and Q are orn 2) a1 and a, are on, while Q, and Q, are off 3) a and a, are off, while Q, and a are on 4) a and d are on, while Q and Qs are off 5 and Q are off, while a and Q are on 6 and are on, while a2 and Q are off a) When the two inputs, v, and v are both low, select one of the following statements: 1) The drain-source voltages (magnitudes) of and a, are low, while the drain-source voltages (magnitudes) of a, and Q are high 2) The drain-source voltages (magnitudes) of and Q are high, while the drain-source voltages (magnitudes) of a and Q are low 3) The drain-source voltages (magnitudes) of a, and Q are low, while the drain-source voltages (magnitudes) of a, and Q, are high 4) The drain-source voltages (magnitudes) of a and Q, are high, while the drain-source voltages (magnitudes) of a, and Q, are low 5) The drain-source voltages (magnitudes) of a, and Q are low, while the drain-source voltages (magnitudes of a, and Q are high 6) The drain-sourceages(magnitudes) of a and are high, while the drain-source voltages (magnitudes) of a and a are low e) Deduce the type of this digital gate. 1) AND gate 2) NAND gate 3) OR gate 4) NOR gate 5) XOR gate

Explanation / Answer

a)

1) The drain-source voltages(magnitudes) of Q1 & Q2 are low, while the drain-source voltages (magnitudes) of Q3 & Q4 are high.

Q1 & Q2 are NMOS and Q3 & Q4 are PMOS. So, when input V1 & V2 are LOW both NMOS are OFF.

Q1 & Q3 ares connected as seies with same input and acts as inveter. So, V1 is low NMOS is OFF (Q1) and Q3 (PMOS) is ON.

Q2 & Q4 ares connected as seies with same input and acts as inveter. So, V2 is low NMOS is OFF (Q2) and Q4 (PMOS) is ON.

b)

5) Q1 & Q4 are OFF, while Q2 & Q3 are ON.

c)

6) The drain-source voltages(magnitudes) of Q1 & Q4 are high, while the drain-source voltages (magnitudes) of Q2 & Q3 are low.

d)

2) Q1 & Q2 are ON, while Q3 & Q4 are OFF.

e)

2) NAND Gate

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