[time-nuts] OP-Amps for 10MHz distribution...?
Bob Camp
lists at rtty.us
Wed Feb 29 22:32:26 UTC 2012
Hi
It's always a "that depends" sort of thing. If you are after total
perfection, then indeed any phase shift is suspect. That includes the shift
from the delay in the op amp.
Bob
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Hal Murray
Sent: Wednesday, February 29, 2012 3:56 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OP-Amps for 10MHz distribution...?
lists at rtty.us said:
> You *could* use transformers or filters to transform to higher impedance,
> but they add phase shift. Phase shift is a problem if it changes (over
time,
> temperature, vibration, phase of the moon...). Change in phase = change in
> time = signal is degraded.
Transformers are handy for providing isolation.
How significant are the phase shifts through a transformer relative to other
sources of trouble?
How much trouble do ground loops cause?
--
These are my opinions, not necessarily my employer's. I hate spam.
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