Bill Janssen wrote:
> I built my own version of this scheme and it works OK but mine has some > "issues" > So I would like to have at least three of these.to replace my one. > > Anyone willing to take on the job of designing a circuit board? > > I log my results with a A-D converter and my Basic program > > Bill K7NOM > Bill I can design a suitable circuit but may need someone else to do the layout as my PCB layout software is rather ancient. There are several options. 1) A CMOS design that operates with input frequencies up to about 20MHz or so but is relatively inexpensive. 2) A modern ECL design that will operate with input frequencies up to about 500MHz at a significantly greater cost. 3) A state of the art SiGe ECL design that will operate with input frequencies up to 1GHz or so. The components wont be much more expensive than option 2 but will probably need a PCB with a good high frequency dielectric (teflon etc). I would suggest that option 1 would be perfectly adequate for comparing 5 and 10MHz sources, whereas comparing 100MHz sources would require either option 2 or option 3. If anyone wants to compare 1GHz sources then option 3 would be useful. Of course one can always use an external divider to produce frequencies within the input range of the comparator. Bruce _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
