![]() On application of the third falling clock edge, FF-A will toggle from 0 to 1 but there is no change of state for FF-B.QBQA = 11 after the third clock pulse. Hence QB changes from 0 to 1.QBQA = 10 after the second clock pulse. On the arrival of second negative clock edge, FF-A toggles again and QA changes from 1 to 0.But at this instant QA was 1. So QB will remain 0.QBQA = 01 after the first clock pulse. If we use n flip flops to design the Johnson counter, it is known as 2n bit Johnson counter or Mod 2n Johnson counter.Īs soon as the first negative clock edge is applied, FF-A will toggle and QA will change from 0 to 1.But at the instant of application of negative clock edge, QA, JB = KB = 0. In this the inverted output of the last stage flip flop is connected to the input of first flip flop. Johnson’s counter or twisted ring counter: The Johnson counter is a modification of ring counter.The Ring counters transfers the same output throughout the circuit. In ring counter if the output of any flip flop is 1, then the output of remaining flip flops is 0. Ring counter: The ring counter is a application of shift register, in which the output of last flip flop is connected to input of first flip flop.Rather than going from the 1001 state to the 1010 state, it recycles to the 0000 state. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |