On 6/18/2015 1:20 PM, Magnus Danielson wrote:
The trick is to convert the 2nd degree loop to a 3rd degree loop, which then allows for a 12 dB/oct slope, to counteract the 9 dB/oct slope.
No this is not correct. A very conventional Type 2 loop, where the loop filter consists of an integrator with series RC for the feedback, and a resistor for the input, will suppress noise at 12 dB/octave with the corner at w=1/RC. A 3rd order loop is rarely helpful because the noise is typically limited by phase detector noise floor. Of all the many hundreds of PLL's I have designed, I don't remember ever using 3rd order. Rick _______________________________________________ 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.
