How to prolong a very short pulse signal for latches of lower frequency to latch it?

Thread Starter

achen

Joined Sep 11, 2022
18
I generated a pulse signal with very short width, it is too short for practical purpose.
How can I prolong it (like the below red drawing) in to a wider square signal so it can be picked up by the latches of much lower clock frequency?

1665351815970.png
 

Papabravo

Joined Feb 24, 2006
19,592
Use a monostable multivibrator, as long as you do not need precise control for the timing of the trailing edge. The length of the pulse will be based on the time constant of an RC network. Never had much use for those parts as a result of that.
 

ronsimpson

Joined Oct 7, 2019
2,532
pulse signal with very short width
We need to know what is "short". 50nS, 20nS, 1nS?? This will change what parts to use.

Here is the IC Papabravo is talking about. 74ls122, 123, or 130. Depending on how you set it up, it will respond to a rising edge or a falling edge. The output will be on for a time set by the Resistor & Capacitor on the RC pin. There are other parts that will do the job.

a wider square signal
Please define "wider". 1 second, 1 year, 3.78mS?


1665363011152.png
1665362955266.png
 

Papabravo

Joined Feb 24, 2006
19,592
We need to know what is "short". 50nS, 20nS, 1nS?? This will change what parts to use.

Here is the IC Papabravo is talking about. 74ls122, 123, or 130. Depending on how you set it up, it will respond to a rising edge or a falling edge. The output will be on for a time set by the Resistor & Capacitor on the RC pin. There are other parts that will do the job.


Please define "wider". 1 second, 1 year, 3.78mS?


View attachment 278068
View attachment 278067
He doesn't need a real part, at least not yet. He is working with the Keysight ADS simulator, which either has no documentation, or that documentation has not been scoured for answers. Chances are this is another 1-post thread.
 

Papabravo

Joined Feb 24, 2006
19,592
There has been many Keysight ADS post recently.
Fifteen to be exact and all by the same person. There does not seem to be any help for him forthcoming. That is why I suggested that he post on a Keysight specific forum if such a thing exists. Member @KeithWalker worked for a predecessor company and assures us that they have excellent and reputable customer support. It seems curious that @achen is not asking for help there. Maybe he his, but we would never know about that.
 
Last edited:
Top