Hi What choices do I have for

[CentauriX]

Hi
What choices do I have for converting a variable DC voltage into a duty cycle for input into the clock input of a logic unit?

 

[xnuke]

Try a voltage-to-frequency converter. It can create a frequency proportional to the DC level that is applied to its input. There are examples in many textbooks.

 

[jbartos]

Suggestion: Essentially, a chopper circuit with the adjustable frequency for chopping to match the required clock frequency will suffice. Visit

http://dspace.dial.pipex.com/awr.tech/ih/ih_fgen.htm

http://www.nwlink.com/~kevinro/chpdrv.pdf

http://www.nwlink.com/~kevinro/products.html

http://www.hku.nl/~pieter/HARD/FSR/FSR.html

http://www.iitkgp.ernet.in/research/sric/rdmag/09.html

etc. for more info