GATE Papers >> ECE >> 2017 >> Question No 144

Question No. 144 ECE | GATE 2017

Figure I shows a 4-bit ripple carry adder realized using full adders and Figure II shows the circuit of a full-adder (FA). The propagation delay of the XOR, AND and OR gates in Figure II are 20 ns, 15 ns and 10 ns, respectively. Assume all the inputs to the 4-bit adder are initially reset to 0.



At t = 0, the input to the 4-bit adder are changed to XXXX= 1100, YYYY= 0100 and Z= 1. The output of the ripple carry adder will be stable at t (in ns)=____________

Answer : 70.0 to 70.0

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