On Mon, 19 Sep 2011 03:52:15 +0200
Peter Krengel krengelda...@gmx.de wrote:
I like to synchronisize a fine 100MHz TCXO with the
10MHz output of the Tbold. The TCXO has a EFC input.
I know this can be done
using a PLL but I do not want to add noise
to the very good noise parameters of the
Replace the 10 mHz oscillator with a divide by ten counter
driven by the 100 mHz signal. Connect the control voltage
from the Tbolt to the 100 mHz oscillator through a low pass
filter and voltage divider that provides the minimum signal
required for discipline. Tboltmon can set gain etc., even
Peter
I would use a PLL like the ADF 4001 because of its low noise floor and
depending of which Tbolt, its phase noise is very good. The advantage is that
you can pick the filter response in such a way that you take advantage of
the individual Osc. parameters.
Bert Kehren
In a message
Hi Tom,
Would it be possible for your application to let the 100 MHz
TCXO free-run? Then you could use one or two of the ADC
channels to sample the TBolt 10 MHz and 1PPS leaving all
the rest of the channels to do real work.
This would then give you all the information you need to apply
phase
but of course: Whatever algorithms you put into your after-the-fact
software correction will have an influence similar to a hardware PLL.
Chris,
I'm curious about this. What are the inherent limits of each
approach? One difference comes to mind -- with a software
post-processing solution you
the TCXO will have to follow the TBolt...
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Peter Krengel
Sent: Sunday, September 18, 2011 9:52 PM
To: time-nuts@febo.com
Subject: [time-nuts] Synchronisizing a 100MHz TCXO with Tbold, pse
If the 100 MHz VCTCXO is fundamentally better than the 10 MHz VC?XO
in the Tbolt, then I would go with Chuck's idea to just use it with a
divide by 10 in front, as the main oscillator. You will still have a
good 10 MHz signal available from the divider - just buffer it up
and maybe harmonic
If your 100 MHz is already at HCMOS levels, then just use a 74AC
family decade divider or D-FF for the downconversion to 10 MHz - very
straightforward. A small series damping resistor may be needed if the
100 MHz signal has to be carried very far from its source.
Ed
...@febo.com] On Behalf Of ewkeh...@aol.com
Sent: Monday, September 19, 2011 4:04 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Synchronisizing a 100MHz TCXO with Tbold, pse
help
Peter
I would use a PLL like the ADF 4001 because of its low noise floor and
depending of which Tbolt, its phase noise
Hello group,
I like to synchronisize a fine 100MHz TCXO with the
10MHz output of the Tbold. The TCXO has a EFC input.
I know this can be done
using a PLL but I do not want to add noise
to the very good noise parameters of the TCXO
cause the 100MHz signal is to be used to clock
a FPGA which
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