Hi Bob, since the sine wave is symmetric, you can use a simple LVC type CMOS inverter with 1M Ohm resistor from input to output, and a 100nF cap (or the largest COG cap you can find) from the input of the inverter to the sine wave output. You may also want to load the sine wave output with 50 Ohms, as required by the source. This works very well. Don't use a schmitt trigger inverter though. bye, Said In a message dated 7/30/2008 17:35:46 Pacific Daylight Time, [EMAIL PROTECTED] writes:
Can you point me to a Time-Nut grade Zero Crossing circuit that I can feed a Actel Igloo FPGA (It doesn't like sine waves)? For the sake of discussion the source signal is a ThunderBolt at 10 MHz. The FPGA is rated to 350 MHz, so no need to have a 5.0000000000000000 GHz Zero Crossing circuit. ;-) The FPGA has several interface styles, so we are not limited to just TTL or CMOS. Suggestions? **************Get fantasy football with free live scoring. Sign up for FanHouse Fantasy Football today. (http://www.fanhouse.com/fantasyaffair?ncid=aolspr00050000000020) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.