Discussion in 'Homework Help' started by Tarquin, Feb 2, 2007.

1. ### Tarquin Thread Starter Member

Dec 14, 2006
11
0
I need the circuit for a 4 bit binary adder using JK Flip Flops.

Nov 17, 2003
6,960
145

Dave

3. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
Hi,

That's a fun assignment. It's a bit like having to make a car out of bricks - possible, but a bit clunky.

4. ### Papabravo Expert

Feb 24, 2006
10,338
1,850
Adders don't require flip-flops. It's a combinatorial circuit.

5. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
But think of the challenge.

6. ### Papabravo Expert

Feb 24, 2006
10,338
1,850
Nonsense! Who would even think of such a question?

7. ### thingmaker3 Retired Moderator

May 16, 2005
5,072
6
Some instructor in Bhopal, obviously.

8. ### Papabravo Expert

Feb 24, 2006
10,338
1,850
......or not since the OP didn't say he was in school. The chief engineer might be engaged in a bit of hazing.

9. ### Tarquin Thread Starter Member

Dec 14, 2006
11
0
I am in an engg college. Could u atleast get me started in the right direction (regarding the assignment), however silly it might seem to u at present.

10. ### Papabravo Expert

Feb 24, 2006
10,338
1,850
I already did. A binary adder is a combinatorial circuit which can be synthesized with logic gates alone. The input values and output values may be held in registers constructed with any of several different kinds of flip-flops. One of those types is the JK type.

The adder has three inputs, called operand A, operand B, and Carry In. It produces two outputs called Result and Carry Out. The carry out from one stage is connected to the carry in of the next stage. The carry in to the lowest stage can be set to zero. Make yourself a truth table and just do it! Is that enough help or do you still need more?

Dec 14, 2006
11
0
Thanx!!

12. ### Papabravo Expert

Feb 24, 2006
10,338
1,850
It would be great if you could post your results for all to see.