How to design divide by 4.5 frequency divider?

[gck]

Hi,

can anybody tell me, how to design divide by 4.5 frequency divider.

thanks in advance

 

[IanP]

Re: frequency divider

To do that you will need two blocks: division by 9 and multiplication by 2 ..
2/9 = 1/4.5 ..
To multiply be 2 you can use XOR gates (7486) and generate two pulses: one at the falling edge and one at the rising edge ..
To divide by 9 you can use 7490 decimal counter in :9 configuration ..
.. see pictures below ..

Regards,
IanP

 

[kanagavel_docs]

Re: frequency divider

This logic is not preferred for synthesis. Try to use both positive and negative edges to derive the clock.

 

[lordsathish]

Re: frequency divider

there is pdf called clock dividers made easy... i think it will be available in this forum... it contains synthesisable circuits for all sort of clock dividers withn explainations... try searching it...

 

[master_picengineer]

frequency divider

Dear loardship,
could you please reupload it. Because I could'nt find it seen the huge amound of pdf available.
Thanks.