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
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
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
On Wed, 04 Jan 2012 00:58:24 -0800, Hal Murray
hmur...@megapathdsl.net 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
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 hmur...@megapathdsl.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] crunching numbers from XOR phase detector
On Wed, Jan 4, 2012 at 12:58 AM, Hal Murray hmur...@megapathdsl.net 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
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
albertson.ch...@gmail.comwrote:
On Wed, Jan 4, 2012 at 12:58 AM, Hal Murray hmur...@megapathdsl.net
wrote:
Neat. Thanks for sharing.
With a
Message
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
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 hmur
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 wa1...@att.net 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
Not yet, but I guess I will now!
Thanks!
-Brian
- Original Message
From: Orin Eman orin.e...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wed, January 4, 2012 12:59:12 PM
Subject: Re: [time-nuts] crunching numbers from XOR phase
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 hmur...@megapathdsl.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] crunching numbers
numbers from XOR phase detector
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 wa1...@att.net 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
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
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
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