[email protected] said: > I think a PIC might be fast enough to DDS it. The output bandpass filter > will cure a lot of sin. Using a dedicated switched capacitor filter would > be fun but more expensive.
There are two parts to a DDS like setup. One is the math for the DDS and then spining for the right number of cycles. The other is a PLL to measure the speed of the clock driving the CPU and tweaking the DDS "constants" so it tracks the PPS. It might be fun to do that with a fixed number of cycles. Or maybe you can use a counter/timer to count cycles. You don't need any filtering. The goal is not to make a pretty picture on a spectrum analyzer. All you have to do is get the long term timing right so the clock doesn't drift. -- These are my opinions. I hate spam. _______________________________________________ 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.
