COMPUTER SCIENCE AND ENGINEERING
DIGITAL LOGIC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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NAND Latch
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NOR Latch
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Mechanical switch
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None of the above
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Detailed explanation-1: -You can use a latch or an SR flip-flop to eliminate signal bounce or noise caused by the switching of a mechanical device (switches, buttons etc.).
Detailed explanation-2: -The solution to this problem is a switch de-bouncing circuit, which makes use of an SR latch constructed from cross-coupled NAND gates as shown in Figure 2-3, along with its associated state table.
Detailed explanation-3: -When a switch is toggled, contacts have to physically move from one position to another. As the components of the switch settle into their new position, they mechanically bounce, causing the underlying circuit to be opened and closed several times.
Detailed explanation-4: -Adding a p-channel MOSFET and a hot-swap controller IC to a mechanical relay removes relay-contact bounce and reduces inrush current.