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Home ‣ Digital Electronics ‣ Flip-Flops See What Others Are Saying!
  • Question

  • A positive edge-triggered J-K flip-flop is used to produce a two-phase clock. However, when the circuit is operated it produces erratic results. Close examination with a scope reveals the presence of glitches. What causes the glitches, and how might the problem be corrected?


  • Options
  • A. The PRESET and CLEAR terminals may have been left floating; they should be properly terminated if not being used.
  • B. The problem is caused by a race condition between the J and K inputs; an inverter should be inserted in one of the terminals to correct the problem.
  • C. A race condition exists between the Q and Q outputs to the AND gate; the AND gate should be replaced with a NAND gate.
  • D. A race condition exists between the clock and the outputs of the flip-flop feeding the AND gate; replace the flip-flop with a negative edge-triggered J-K Flip-Flop.

  • Correct Answer
  • A race condition exists between the clock and the outputs of the flip-flop feeding the AND gate; replace the flip-flop with a negative edge-triggered J-K Flip-Flop. 

    • More questions

    • 1. In HDL, LITERALS is/are:

    • Options
    • A. digital systems.
    • B. scalars.
    • C. binary coded decimals.
    • D. a numbering system.
      • Discuss
    • 2. Convert the following decimal number to hexadecimal.
      74

    • Options
    • A. A416
    • B. B416
    • C. 4A16
    • D. 4B16
      • Discuss
    • 3. Most modern digital systems are based on semiconductor technology.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The BCD equivalent of 73 is 01001001.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The stepper motor HDL will ignore its counter inputs and pass control inputs directly to the output when set in mode ________.

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 6. The CMOS uses bipolar transistors instead of MOSFET.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. In TTL the noise margin is between 0.8 V and 0.4 V.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A very critical dimension in project management is the time your boss will give you to complete the HDL project.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The Boolean sum of the four product terms is called the sum-of-products.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. How many flip-flops are required to construct a decade counter?

    • Options
    • A. 10
    • B. 8
    • C. 5
    • D. 4
      • Discuss

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