Rick,
On 06/19/2015 07:32 AM, Richard (Rick) Karlquist wrote:
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.
Which was what I meant. You have your third pole in that filter, but you
put away from the dominant pair.
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.
I think I just didn't use the terms you expected. Cool it.
Cheers,
Magnus
_______________________________________________
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.
