.
- Henry
Brian Justin schrieb:
Not yet, but I guess I will now!
Thanks!
-Brian
- Original Message
From: Orin Eman
To: Discussion of precise time and frequency measurement
Sent: Wed, January 4, 2012 12:59:12 PM
Subject: Re: [time-nuts] crunching numbers from XOR phase detector
Have you
On 1/4/12 8:14 AM, Joe Gwinn wrote:
At 10:16 AM + 1/4/12, time-nuts-requ...@febo.com wrote:
Date: Wed, 04 Jan 2012 00:58:24 -0800
From: Hal Murray
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] crunching numbers from XOR phase detector
Message-ID
Not yet, but I guess I will now!
Thanks!
-Brian
- Original Message
From: Orin Eman
To: Discussion of precise time and frequency measurement
Sent: Wed, January 4, 2012 12:59:12 PM
Subject: Re: [time-nuts] crunching numbers from XOR phase detector
Have you tried the 74HCT9046
Have you tried the 74HCT9046? They claim no dead zone. Note - seems to be
HCT only.
Orin.
On Wed, Jan 4, 2012 at 9:32 AM, Brian Justin wrote:
> Be very careful of the FPD in the 4046. It has a dead-zone when the phase
> error
> is at or very close to zero. Some versions of the chip claim to
- Original Message
From: Chris Albertson
To: Discussion of precise time and frequency measurement
Sent: Wed, January 4, 2012 12:21:06 PM
Subject: Re: [time-nuts] crunching numbers from XOR phase detector
On Wed, Jan 4, 2012 at 12:58 AM, Hal Murray wrote:
>
> Neat. Thanks for sharing
You're right there are 3 phase detectors in the 4046: RS and JK flip-flops
and and XOR gate.
On Wed, Jan 4, 2012 at 6:21 PM, Chris Albertson
wrote:
> On Wed, Jan 4, 2012 at 12:58 AM, Hal Murray
> wrote:
>
> >
> > Neat. Thanks for sharing.
> >
> > With a XOR, you can't tell which input is higher
On Wed, Jan 4, 2012 at 12:58 AM, Hal Murray wrote:
>
> Neat. Thanks for sharing.
>
> With a XOR, you can't tell which input is higher frequency. I think you
> can
> fix that with a second XOR and a delay line.
I think you can build a PFD or Phase Frequency Detector with three or four
flip flo
At 10:16 AM + 1/4/12, time-nuts-requ...@febo.com wrote:
Date: Wed, 04 Jan 2012 00:58:24 -0800
From: Hal Murray
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] crunching numbers from XOR phase detector
Message-ID:
<20120104085824.8426e
On Wed, 04 Jan 2012 00:58:24 -0800, Hal Murray
wrote:
>With a XOR, you can't tell which input is higher frequency. I think you can
>fix that with a second XOR and a delay line.
>
>I think 90 degrees of delay will provide the most information. At 10 MHz,
>that's 25 ns. I think that's about 15
Neat. Thanks for sharing.
With a XOR, you can't tell which input is higher frequency. I think you can
fix that with a second XOR and a delay line.
I think 90 degrees of delay will provide the most information. At 10 MHz,
that's 25 ns. I think that's about 15 feet of good coax.
all that s
Le 04/01/2012 09:58, Hal Murray a écrit :
Neat. Thanks for sharing.
With a XOR, you can't tell which input is higher frequency. I think you can
fix that with a second XOR and a delay line.
I think 90 degrees of delay will provide the most information. At 10 MHz,
that's 25 ns. I think that's
Neat. Thanks for sharing.
With a XOR, you can't tell which input is higher frequency. I think you can
fix that with a second XOR and a delay line.
I think 90 degrees of delay will provide the most information. At 10 MHz,
that's 25 ns. I think that's about 15 feet of good coax.
--
These a
Having access to two Rb sources and looking at phase shift and jitter is
something I find interesting. Has anyone fed two Rb sourced 10mhz signals
in to a high-z an op-amp and looked at the output on a SA ? Should probably
have at least 100mhz bw on the SA in order to see the events. A few tests
to
There is some nonlinearity but it seems consistent from cycle to cycle. I
might be able to reduce the bumps with better circuit layout, shorter
wires, terminated lines etc. But just for playing around with my initial
data, I think I can model the shape of the response and get a more accurate
re
Previously I have been comparing 10 MHz frequencies using TvB's picPET
device plus a picDIV divider to get a 1 PPS signal, but I wanted more
resolution for comparing relative drift of two Rb references. I got square
wave outputs from my references (see my previous posts) and I made a simple
XOR
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