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Design a Pulse Clipper

This interview question is to design a black box that receives clock and cuts every second pulse. Basically you need to design a hardware system to eliminate the 'second clock'

 

 

 

 

   Figure 1: Pulse Clipper

As we can see from Figure 1, our black box is a simple clock divider with 25% duty cycle. So, to achieve this we need a controlled clock divider. To avoid glitches, the output must be locked in low position when counter changes its state. That means we need one negative-edge trigger as clock divider and one “AND” gate. The timing diagram is shown on Figure 2.

 

 Figure 2: Timing Diagram

The solution is based on a clock divider by 2, and an AND gate.

Figure 2: The Solution

 

 

 

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