Hi Simon,
On 29/10/14 20:15, Simon Marsh wrote:
This is a fairly long post, at the top is a bit of description of of
changes since my last posts and then around the middle is some
description of the data thats attached. The data raises a few questions,
and I'll put those in a separate post.
Agilent and Hitite make the only monsters that I am aware of being
commercially available.
I have heard tell of implementing time interleaved ADCs and
magical wonderous but barely stable fpga ideas. Could ask around.
hol...@hotmail.com wrote:
A friend of mine is looking for an ADC that can
On 30 Oct 2014 04:48, Mark Sims hol...@hotmail.com wrote:
A friend of mine is looking for an ADC that can do 5 bits at 20-40
gigasamples/second... there is a timing related component to the project.
Any ideas of who makes a decent beastie? It needs to supply continuous
data so things like a
On 30/10/2014 07:12, Iain Young wrote:
Hi Simon,
On 29/10/14 20:15, Simon Marsh wrote:
This is a fairly long post, at the top is a bit of description of of
changes since my last posts and then around the middle is some
description of the data thats attached. The data raises a few questions,
pipeline converter, but it needs as many clock period as the required
bits, does he has the fast logic to deal with that amount of data?
73
KJ6UHN
Alex
On 10/29/2014 9:46 PM, Mark Sims wrote:
A friend of mine is looking for an ADC that can do 5 bits at 20-40
gigasamples/second... there is a
Lots more pictures and data uploaded here:
https://drive.google.com/folderview?id=0BzvFGRfj4aFkMFBtNWFSZVBKWkkusp=sharing
In an effort to understand which component was responsible for my ~17us
spikes I decided to go back to basics with just a single DFlop (AC74) on
a breadboard; no BBB, just
Generally speaking, metastability problems with FF's are caused
by an inappropriate timing relationship causing both of the latch
gates to get stuck between a logic 1 and a logic 0. If you are
in the exact right spot, the FF has no way to decide whether to go
up, or to go down, so it just hangs
Fujitsu used to sell ultra-fast charge mode interleaved sampler (CHAIS)
ICs.
These have analog bandwidths of ~20GHz and sampling rates of 65 GS/s, 8-bit
resolution, with ENOB 5-6.
They pipe data out at a max 128 bit* 500MHz (8 GB/s). How are you planning
to digest this data stream?
Regards,
Just a hint: I tried successfully Ulrichs Z38XX software
(http://www.ulrich-bangert.de/html/downloads.html)
in Windows7-32. At least the Manual Command Entry and the Debug
Window should work.
regards Götz
Am 29.10.2014 23:55, :
Hi
One thing that might help others who are having issues with
and here comes another trick:
Ulrich's Z38XX can be persuaded to accept the Z3811 instead of an Z3805.
For this to happen search with an Hex-editor in Z38XX twice for the
string z3805 and replace this z3805 with z3811, save the changes and
enjoy the various Views Ulrich provided.
Götz
Am
A startup in Massachusetts named Hypres has/had exactly what you want.
It is a cryogenic delta-sigma converter using some kind of quantum logic.
As I remember it did about four bits per sample at up to 40 Giga-samples
per second.
You have to run it submerged in liquid Helium. But they would sell
He will use a beagleboard via bluetooth to absorb the data rate hahaha.
Pipedream.
In a message dated 10/30/2014 10:32:58 Pacific Daylight Time,
ke9h.gra...@gmail.com writes:
A startup in Massachusetts named Hypres has/had exactly what you want.
It is a cryogenic delta-sigma
From: Simon Marsh subscripti...@burble.com
Subject: Re: [time-nuts] BBB DDMTD - analysis
Message-ID: 54524f04.7060...@burble.com
The first few pics (DFlop-unsync-floating-*) show
the Q output, which was unconnected to anything
other than the oscilloscope. They show a few glitches
at the
subscripti...@burble.com said:
In an effort to understand which component was responsible for my ~17us
spikes I decided to go back to basics with just a single DFlop (AC74) on a
breadboard; no BBB, just a couple of oscillators driving the data and clock
pins ...
I don't know what the
I also tried Steward Cobbs RS422 - Rs232 hack but with no joy in the
beginning. First I had used the standard RS232 com1 port of my computer
with no success. Later I tried my Prolific USB-to Serial adapter and
things got better. After some measurments and looking at the pinout of
the
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault
light is on and the No GPS and Standby lights flash. When I connect my GPS
antenna, the No GPS light stops flashing and stays on. After several minutes
only the Standby light is on.
When I connect both the Ref1
subscripti...@burble.com said:
In an effort to understand which component was responsible for my ~17us
spikes ...
17 microseconds is 58 KHz. That's a reasonable number for a switching power
supply.
What does your power look like?
I don't know what you are using for a circuit. My guess is
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5?
And can you remind me whether you are using the supplied interface cable, or
are you using something else? After warmup, the ON light is on for the REF-0
unit and the STBY light is on for the REF-1
Oh, it gets much more fun than that... try doing it with 32 channels.
I haven't a clue what this system will use... and frankly am rather glad I
don't have to do it.
I have built some rather large systems that were a bit ahead of their time.
Early 80's did a 256,000 custom processor
The fault light will come on until both oscillators have locked. It takes a
long while, at least on mine.
I think it needs to establish the position before everything is stable.
- Original Message -
From: Anthony Roby ar...@antamy.com
To: Discussion of precise time and frequency
Am 30.10.2014 um 20:08 schrieb Hal Murray:
17 microseconds is 58 KHz. That's a reasonable number for a switching power
supply.
What does your power look like?
I don't know what you are using for a circuit. My guess is that the crap on
the power is shifting the switching point slightly.
Karen,
as by the datasheet, the time interval resolution of your counter is 50 ps.
This translates into an ADEV value of 5E-11 at tau = 1 sec, 5E-12 at tau
= 10 sec etc, and represents the theoretical measurement limit of the
counter.
It can be measured by feeding the same signal into both
Hi
The gotcha with translating ADEV directly to a measurement is the nature of
ADEV. You are looking at a standard deviation measure, so the result will be
some sort of “one sigma” kind of measure.
Bob
On Oct 30, 2014, at 6:32 PM, Adrian rfn...@arcor.de wrote:
Karen,
as by the
Hi
It looks like the power bricks are labeled 1.9A. This is at 18V. At 24V max
current is probably 1.3A or so. It’s also labeled 25W. That is a good
indication the 1.3 might be a little high. It’s a good bet that the -15V
output has nearly zero load, so the “real” max should be below 1A at
Hi
On Oct 28, 2014, at 11:41 PM, Tom Miller tmiller11...@verizon.net wrote:
Until you have the two units tied together and GPS ok and the Fault light
out, you won't see the 15 MHz signal. You should see a 5 volt pp square wave
of sorts coming out of the 10 MHz port.
I found a clean 10
I was finally able to get my units to lock and behave as described below. I am
still unable to get any data into the PC, either via the RS422 to RS232 hack or
through Götz Romahn's modification of the RS422 output. This issue must be to
do with the voltage levels.
I did connect my scope up
Hi
I wonder if anybody has a copy of Ulrich’s source code? If so, there might be
somebody on the list willing to rework it for the 3810 series and the more
modern operating systems.
Bob
On Oct 30, 2014, at 1:25 PM, Götz Romahn go...@g-romahn.de wrote:
and here comes another trick:
Hi
How about a picture of the “as built” circuit? There may be something about the
construction that’s the issue.
Bob
On Oct 30, 2014, at 10:45 AM, Simon Marsh subscripti...@burble.com wrote:
Lots more pictures and data uploaded here:
Hi Anthony,
When you ran Satstat, did you open the serial port? Click Commport-Settings
and set it 9600,8,N,1. Then click Commport-Port open. Works OK under XP for
me. I haven't tried it under Wine as I'm out of serial ports on the server and
have the laptop to use.
Bob
From:
Yes I did, with XP running in VirtualBox on Win7 with COM1 mapped to the
hardware port and a serial cable connected to another cable that does the pin
conversion. I also tried it via a USB cable connected to an FTDI serial to USB
convertor. I'll play around with it some more this weekend.
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