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Get Answers to all your Questions
- #Physics Part II Textbook for Class XII
- #Semiconductor Electronics: Materials, Devices and Simple Circuits
- #NCERT
- #CBSE 12 Class
- #Physics
Q 14.13 You are given two circuits as shown in Fig. 14.38, which consist of NAND gates. Identify the logic operation carried out by the two circuits.
Answers (1)
a) A and B are inputs of a NAND gate and the output of this gate is the input of another NAND gate so,
Y =
Y=
Y=
Hence this circuit functions as an AND gate.
b) A is input to the NAND gate output of which goes to the rightmost NAND gate. Also, B is input to the NAND gate whose output goes to the rightmost NAND gate.
Y =
Y = +
Y = A + B
Hence the circuit functions as an OR gate.
Alternative method
Construct the truth table by giving various inputs and observing the output
|
INPUT |
INTERMEDIATE OUTPUT |
OUTPUT |
| 00 | 1 | 0 |
| 01 | 1 | 0 |
| 10 | 1 | 0 |
| 11 | 0 | 1 |
The above truth table is the same as that of an AND gate
fig. b
| INPUTS | OUTPUT |
| 00 | 0 |
| 01 | 1 |
| 10 | 1 |
| 11 | 1 |
The above truth table is the same as that of an OR gate
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