Although the DDS settles rapidly there some filter settling time is required.
These systems are combinations of DDS and direct synthesis with microsecond or
sub microsecond settling.
Bruce.
On October 8, 2014 at 3:52 AM Hal Murray hmur...@megapathdsl.net wrote:
br...@ko4bb.com said
Kratos (www.kratosepd.com) do fast switching synthesiser subsystems that can
be locked to a reference..
Aeroflex (www.aeroflex.com/ASCS) do 250ns settling time synthesisers.
Bruce
On October 7, 2014 at 7:52 PM Jim Lux jim...@earthlink.net wrote:
On 10/7/14, 1:19 PM, Don Latham wrote:
I
http://gmcatalog.kratosepd.com/index.cfm?act=prodsforgroupgrp=45
http://ams.aeroflex.com/ASCS/micro-ASCS-prods-synthesizers.cfm
are the relevant webpages
Bruce
On October 7, 2014 at 11:06 PM br...@ko4bb.com br...@ko4bb.com wrote:
Kratos (www.kratosepd.com) do fast switching synthesiser
I have a couple of these. however their noise spectral density tends
to rise precipitously below 1Hz or so. There are regulators with significantly
lower flicker noise.
Bruce
On August 7, 2014 at 6:35 AM Tom Van Baak t...@leapsecond.com wrote:
Ole,
Thanks for bringing it to our
Recently I have been comparing the phase noise of the HOlzworth HX4210 and the
LTC7957-4.
I have found that the performance of these devices is comparable with a 10MHz
sinewave input with a PN noise floor below -160dBc/Hz.
For offsets below 100Hz the LTC6957-4 is quieter and for offsets below 50Hz
On 07/29/2014 10:55 AM, br...@ko4bb.com wrote:
Recently I have been comparing the phase noise of the HOlzworth HX4210 and
the
LTC7957-4.
I have found that the performance of these devices is comparable with a
10MHz
sinewave input with a PN noise floor below -160dBc/Hz.
For offsets
However that will increase the signal transition times to significanly greater
than the 300ps seen at the LTC6957 output.
Bruce
On July 29, 2014 at 7:54 AM Gerhard Hoffmann dk...@arcor.de wrote:
Am 29.07.2014 um 13:38 schrieb David C. Partridge:
Further to my previous post:
I note that
-boun...@febo.com] On
Behalf Of br...@ko4bb.com
Sent: 29 July 2014 12:00
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Sine to square wave converter Phase Noise
Sorry, I meant the LTC6957-4 of course._SELA = l FILTA = L FILTB = H ie an
input stage BW
The Achilles heel of that biasing technique is that the emitter currents of the
pair of pnp's is affected by the noise on the 20V supply.
The 20V supply noise is only attenuated by a factor of 5 or so when both
transistors have equal collector currents.
I have both an LTC evaluation board for the
On July 10, 2014 at 10:55 AM ewkeh...@aol.com wrote:
As part of the FE 405 B project a separate output circuit is in the works.
The universal controller and auxiliary board are the same as used in the
FE5680A GPSDO but because of the very low ADEV a separate circuit board that
divides by
Sadly Ina was terminally ill and died in May 2012.
Ulrich kept this to himself until about six months later in an email explaining
why he had been out of touch.
In respect for Ulrich's wishes I kept this news off the list.
Ulrich's Obituary indicates that one parent, his in-laws and siblings as
There has been some controversy over the Phase noise of CMOS logic devices.
Perhaps the apparently anomalously low PN measures are due to the use of cross
correlation in the phase noise measurement equipment and the occurrence of
phenomena detailed in the recent NIST papers:
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