Pulse Width Detection Circuit

Hi PengYu,

Please provide some additional details such as voltage levels of the signal, frequency range (how often is the pulse-width measured?), pulse-width range, and any additional details.  A block diagram of the system would also be helpful.

Regards,

~Leonard

 

Hi Leonard,

Is there any reference circuit you could share? A simple analog implementation (e.g., by some logic gate(s)) is needed.

Thanks.

Hi Pengyu,

 I am still not clear on what you are wanting to accomplish.  Are you looking to verify a minimum pulse width, and anything less than the minimum is rejected?   If so, a comparator with a '555 timer triggered by the pulse on one input, the pulse itself on the other would be a rather simple implementation.  Again, what are the MIN and MAX pulse widths?

Or do you want to measure the pulse width? 

Or just detect the presence of a transitioning edge?  And what is the source of the pulse?

~Leonard

Hi Pengyu,

What's the voltage for the pulse? Analog implementation only or we can use a MCU? A simple way is using GPIO interrupt to detect the start edge of the pulse then start a timer for 4ms threshold. MSP430FR2000 could be a option.

regards
KC