Hi Alexander,
On Thu, 15 Mar 2012 11:51:06 +0100, Alexander Huemer
<alexander.huemer(a)xx.vu> wrote:
Assuming this is the case, could something like a
Schmitt trigger
between the sine wave source and the PLL improve the situation?
Or would that add jitter or some other negative effects to the signal?
74AC(T)04 are considered quite excellent input stages (or amplifiers for
fanout) for
timing signals.
See, for example, this posting on the "time-nuts" mailinglist (which is
dedicated
to precision frequency measurement/timekeeping):
http://www.mail-archive.com/time-nuts@febo.com/msg26830.html
With a feedback resistors (say, a few 10kOhm) and a series input capacitor
(a few nF)
the bias-DC of the input will automatically adjust to 1/2 duty cycle.
Using anything more fancy, for example high-bandwidth comparators, is
frowned upon.
Chris