On Wed, Jan 4, 2012 at 12:58 AM, Hal Murray <[email protected]> wrote:
> > Neat. Thanks for sharing. > > With a XOR, you can't tell which input is higher frequency. I think you > can > fix that with a second XOR and a delay line. I think you can build a PFD or Phase Frequency Detector with three or four flip flops. This avoid using the delay line and works over a wide range. If I'm not mistaken there is a PFD inside the 74HC4046. It uses flip flops. Be sure to look at the 74HC type not the cd4046. The 75hc type works up to 18MHz. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
