Physical design engineer interview questions shared by candidates
You are provided with one XOR gate, one OR gate and one NOR gate. Please build a NAND gate.
use truth table and see the pattern
Use the NOR and XOR gates as inverters and hook them up to the inputs of the OR gate. This is the De-Morgan equivalent of a NAND gate.
Convert the xor into inverter by connecting one of its i/p to logic 1
Draw a two-put NAND gate and size it, assuming the ratio of PMOS/NMOS is 2 in inverter. Then suppose two input are A and B for NMOS and PMOS. A is close to output and B is close to ground, input A change from 0 to 1 at t=t1, input B change from 0 to 1 at t =t1 (t1 > t0). Describe how the output change. Then input B changes from 0 to 1 first then input A changes from 0 to 1. Describe how the output changes. Are there any differences between these two scenarios?
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