Hi
Not sure if you could do it with just a straight PRNG or not. The idea is
normally approached as picking the codes you hop between so the errors (phase
and amplitude null out. In practice that may not be any different than random
since you don't really know what the D/A is doing.
Bob
On Ma
In message , Bob Camp writes:
>The 9852 can be dithered from an external source. Of course, to
>be effective, you need a source that can calculate and transmit a
>multi megabit / second bit stream to do it. That gets you right
>back to the FPGA.
There are dedicated PRNG chips which would do a pre
he Symmetricom AOG 110 must be similar in design.
>
> Best regards
> Ulrich Bangert
>
>> -Ursprungliche Nachricht-
>> Von: time-nuts-boun...@febo.com
>> [mailto:time-nuts-boun...@febo.com] Im Auftrag von Bruce Griffiths
>> Gesendet: Mont
and frequency measurement
> Betreff: Re: [time-nuts] DDS in GPSDO design?
>
>
> Poul-Henning Kamp wrote:
> > In message<4fc2a5e9.7050...@partiallystapled.com>, Michael Tharp
> > writes:
> >
> >
> >> Does anyone have any comments or experie
Poul-Henning Kamp wrote:
In message<4fc2a5e9.7050...@partiallystapled.com>, Michael Tharp writes:
Does anyone have any comments or experience with DDS-based frequency
references?
I belive that is basically how the optional "output generator" works for
hydrogen masers.
The Symmet
cell
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bruce Griffiths
Sent: Monday, May 28, 2012 1:44 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] DDS in GPSDO design?
Since the Taylor series
In message <4fc2a5e9.7050...@partiallystapled.com>, Michael Tharp writes:
>Does anyone have any comments or experience with DDS-based frequency
>references?
I belive that is basically how the optional "output generator" works for
hydrogen masers.
--
Poul-Henning Kamp | UNIX since Zilog Z
[mailto:time-nuts-boun...@febo.com] On
Behalf Of Bruce Griffiths
Sent: Monday, May 28, 2012 1:44 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] DDS in GPSDO design?
Since the Taylor series correction is done entirely within the FPGA there
should be no settling
Behalf Of Bruce Griffiths
Sent: Monday, May 28, 2012 12:36 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] DDS in GPSDO design?
These Xilinx datasheets indicate the performance of some techniques:
http://www.xilinx.com/support/documentation/ip_doc
uency measurement
Subject: Re: [time-nuts] DDS in GPSDO design?
These Xilinx datasheets indicate the performance of some techniques:
http://www.xilinx.com/support/documentation/ip_documentation/ds794_dds_compi
ler.pdf
http://www.xilinx.com/support/documentation/ip_documentation/dds.pdf
The T
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bruce Griffiths
Sent: Monday, May 28, 2012 12:10 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] DDS in GPSDO design?
Michael Tharp wrote:
On 05/27/2012 06
Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bruce Griffiths
Sent: Monday, May 28, 2012 12:10 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] DDS in GPSDO design?
Michael Tharp wrote:
On 05/27/2012 06:23 PM
...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bruce Griffiths
Sent: Monday, May 28, 2012 12:10 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] DDS in GPSDO design?
Michael Tharp wrote:
> On 05/27/2012 06:23 PM, Bruce Griffiths wrote:
>> The
Michael Tharp wrote:
On 05/27/2012 06:23 PM, Bruce Griffiths wrote:
The principal problem with conventional DDS implementations is phase
truncation spurs which can occur close to the desired carrier.
Virtually all commercial DDS chips produce such phase truncation spurs.
It is possible to elimi
On 05/27/2012 07:10 PM, Magnus Danielson wrote:
How far off? What Rb do you have?
Most Rb:s not having a EFC input should be possible to modify for EFC in
one way or another, since the C-field needs to be applied regardless.
I don't know how far off it is. It's an Efratom 102100-001, which
th
On 05/27/2012 06:23 PM, Bruce Griffiths wrote:
The principal problem with conventional DDS implementations is phase
truncation spurs which can occur close to the desired carrier.
Virtually all commercial DDS chips produce such phase truncation spurs.
It is possible to eliminate such spurs if one
standards with variable DSS
output that can be real handy.
Thomas Knox
Date: Sun, 27 May 2012 18:08:41 -0400
From: g...@partiallystapled.com
To: time-nuts@febo.com
Subject: [time-nuts] DDS in GPSDO design?
Greetings,
I've been pondering topologies for a custom GPSDO design and two obv
utput that can be real handy.
Thomas Knox
> Date: Sun, 27 May 2012 18:08:41 -0400
> From: g...@partiallystapled.com
> To: time-nuts@febo.com
> Subject: [time-nuts] DDS in GPSDO design?
>
> Greetings,
>
> I've been pondering topologies for a custom GPSDO design and
On 05/28/2012 01:41 AM, Bob Camp wrote:
Hi
Simple answer - good resolution is a challenge to get. It's much easier to
modify the Rb to make it pull able.
It can be as simple as a wire and a resistor into the right place.
Cheers,
Magnus
___
time-nu
Hi
Simple answer - good resolution is a challenge to get. It's much easier to
modify the Rb to make it pull able.
Bob
On May 27, 2012, at 6:08 PM, Michael Tharp wrote:
> Greetings,
>
> I've been pondering topologies for a custom GPSDO design and two obvious
> choices seem to present themsel
On 05/28/2012 12:08 AM, Michael Tharp wrote:
Greetings,
I've been pondering topologies for a custom GPSDO design and two obvious
choices seem to present themselves. The first, and seemingly more
popular by far, is to use a "pullable" oscillator as many OCXO and Rb
oscillators are and discipline
Michael Tharp wrote:
Greetings,
I've been pondering topologies for a custom GPSDO design and two
obvious choices seem to present themselves. The first, and seemingly
more popular by far, is to use a "pullable" oscillator as many OCXO
and Rb oscillators are and discipline it using a slow but p
Greetings,
I've been pondering topologies for a custom GPSDO design and two obvious
choices seem to present themselves. The first, and seemingly more
popular by far, is to use a "pullable" oscillator as many OCXO and Rb
oscillators are and discipline it using a slow but precise DAC. But
unfor
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