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Palinurus
Guest

Fri Feb 06, 2009 1:13 pm   



I have need to generate an extremely fast pulse to characterize the rise
time of oscilloscopes, and am disinclined (read "unable") to spend the
$Ks to buy a full-fledged scope calibrator. I notice that there are
occasionally tunnel diode pulse heads available used or surplus, but
nobody seems to know what kind of drive signal they require. One Tek
part currently on eBay, 067-0681-01, even Tektronix seems to know
nothing about. (Thanks a lot, Tek.) Is any information available? I
wouldn't be averse to building one, if I had a reliable design.

Tim Williams
Guest

Fri Feb 06, 2009 4:45 pm   



On Feb 6, 6:13 am, Palinurus <dissco...@oplink.net> wrote:
Quote:
I have need to generate an extremely fast pulse to characterize the rise
time of oscilloscopes, and am disinclined (read "unable") to spend the
$Ks to buy a full-fledged scope calibrator. I notice that there are
occasionally tunnel diode pulse heads available used or surplus, but
nobody seems to know what kind of drive signal they require. One Tek
part currently on eBay, 067-0681-01, even Tektronix seems to know
nothing about. (Thanks a lot, Tek.) Is any information available? I
wouldn't be averse to building one, if I had a reliable design.

Ah, look up Jim Williams' AN47 or "The Taming of the Slew" appnotes.
Both contain the same circuit, a BJT avalanche pulse generator, using
the 2N2369 to be exact. 2N3904 may even work. This type of circuit
typically switches in less than 2ns, with 350ps risetimes easy to
manage. If that's not enough, you might get some step recovery
diodes, which are reasonably easy to use (using them to their fullest
potential is only a little more complicated).

The kickinest stuff today involves screaming fast snap diodes, shock
lines and GaAs monolithics (including integrated shock lines!),
reaching single digit picoseconds. There are other approaches, too,
but they're more scientific (like femtosecond laser pulses converted
somehow into electricity).

Tim


Guest

Fri Feb 06, 2009 4:45 pm   



On Feb 6, 7:13 am, Palinurus <dissco...@oplink.net> wrote:
Quote:
I have need to generate an extremely fast pulse to characterize the rise
time of oscilloscopes, and am disinclined (read "unable") to spend the
$Ks to buy a full-fledged scope calibrator. I notice that there are
occasionally tunnel diode pulse heads available used or surplus, but
nobody seems to know what kind of drive signal they require. One Tek
part currently on eBay, 067-0681-01, even Tektronix seems to know
nothing about. (Thanks a lot, Tek.) Is any information available? I
wouldn't be averse to building one, if I had a reliable design.

How about using a fast logic chip in a 50 ohm PCB?
Just draw one up and get Alberta Printed Circuits to work on it and
the next day you got a PCB.
For the 067-0681-01, join the Yahoo Tekscopes group and ask them.
(I can't guarantee this, but I think this unit was meant to be
connected to the scope's (500 series and so on)
calibrator, and sharpens the rise-time. It's basically a tunnel diode
in a circuit powered by the square wave from the scope. Since the 500
series has a calibrator that can give 100V square waves, this is more
than enough to power such a gadget. )

Also be aware there is no need for a 1ps rise-time for a scope with a
100ps rise time.
What rise-time do you need? I'll look in the lab, we have a graveyard
of unused Micrel eval boards with SMAs on em. Great stuff.

Jim Yanik
Guest

Fri Feb 06, 2009 5:04 pm   



Palinurus <disscourn_at_oplink.net> wrote in
news:2bydnTC8Sr7xtBHUnZ2dnUVZ_trinZ2d_at_posted.oplink:

Quote:
I have need to generate an extremely fast pulse to characterize the rise
time of oscilloscopes, and am disinclined (read "unable") to spend the
$Ks to buy a full-fledged scope calibrator. I notice that there are
occasionally tunnel diode pulse heads available used or surplus, but
nobody seems to know what kind of drive signal they require. One Tek
part currently on eBay, 067-0681-01, even Tektronix seems to know
nothing about. (Thanks a lot, Tek.) Is any information available? I
wouldn't be averse to building one, if I had a reliable design.


TEK TD pulsers needed about 70-100V to drive them.A TEK 106 or PG506 hi-
amplitude output was used to drive them.Rise time was IIRC;1 ns.

that 067-0681-01 is just a pot,3 1K 1/8w resistors and a TD inside a nice
cast aluminum box with BNC's.

I -used- to have the schematic,when I was at TEK.

I even built my own pulser;if I find it,I'll open it up and copy it
down,and post it here or in alt.binaries.schematics.

--
Jim Yanik
jyanik
at
kua.net

John Larkin
Guest

Fri Feb 06, 2009 5:12 pm   



On Fri, 06 Feb 2009 06:13:30 -0600, Palinurus <disscourn_at_oplink.net>
wrote:

Quote:
I have need to generate an extremely fast pulse to characterize the rise
time of oscilloscopes, and am disinclined (read "unable") to spend the
$Ks to buy a full-fledged scope calibrator. I notice that there are
occasionally tunnel diode pulse heads available used or surplus, but
nobody seems to know what kind of drive signal they require. One Tek
part currently on eBay, 067-0681-01, even Tektronix seems to know
nothing about. (Thanks a lot, Tek.) Is any information available? I
wouldn't be averse to building one, if I had a reliable design.

You can probably drive it from a standard pulse generator. But TD
pulsers make ugly waveforms... a slow rise, then a fast jump, then a
slow drool to finish up. I vaguely recall that that particular box may
be slow.

A fast logic gate (NC7NZ34) or LVDS receiver (SN65LVDSDCBR), properly
grounded and bypassed, will make a clean sub-ns step output without
the TD artifacts.

How fast do you need?

John

Jim Yanik
Guest

Fri Feb 06, 2009 5:14 pm   



Jim Yanik <jyanik_at_abuse.gov> wrote in
news:Xns9BAA70994D117jyanikkuanet_at_74.209.136.83:

Quote:
Palinurus <disscourn_at_oplink.net> wrote in
news:2bydnTC8Sr7xtBHUnZ2dnUVZ_trinZ2d_at_posted.oplink:

I have need to generate an extremely fast pulse to characterize the
rise time of oscilloscopes, and am disinclined (read "unable") to
spend the $Ks to buy a full-fledged scope calibrator. I notice that
there are occasionally tunnel diode pulse heads available used or
surplus, but nobody seems to know what kind of drive signal they
require. One Tek part currently on eBay, 067-0681-01, even Tektronix
seems to know nothing about. (Thanks a lot, Tek.) Is any information
available? I wouldn't be averse to building one, if I had a reliable
design.


TEK TD pulsers needed about 70-100V to drive them.A TEK 106 or PG506
hi- amplitude output was used to drive them.Rise time was IIRC;1 ns.

that 067-0681-01 is just a pot,3 1K 1/8w resistors and a TD inside a
nice cast aluminum box with BNC's.

I -used- to have the schematic,when I was at TEK.

I even built my own pulser;if I find it,I'll open it up and copy it
down,and post it here or in alt.binaries.schematics.


As far as I recall the pulser was wired something like this

v.pot 1K 1K 1K
input BNC>---/\/\/\/------/\/\/---/\/\/\--/\/\/\---> BNC
|
|
[TD]
|
gnd

keep all leads short.Maybe build it on a PCB.
(the TEK pulser was point-point wired.)

I can't recall the pot value. adjust pot to where the TD -just- triggers.

--
Jim Yanik
jyanik
at
kua.net

John Larkin
Guest

Fri Feb 06, 2009 5:40 pm   



On 6 Feb 2009 16:14:49 GMT, Jim Yanik <jyanik_at_abuse.gov> wrote:

Quote:
Jim Yanik <jyanik_at_abuse.gov> wrote in
news:Xns9BAA70994D117jyanikkuanet_at_74.209.136.83:

Palinurus <disscourn_at_oplink.net> wrote in
news:2bydnTC8Sr7xtBHUnZ2dnUVZ_trinZ2d_at_posted.oplink:

I have need to generate an extremely fast pulse to characterize the
rise time of oscilloscopes, and am disinclined (read "unable") to
spend the $Ks to buy a full-fledged scope calibrator. I notice that
there are occasionally tunnel diode pulse heads available used or
surplus, but nobody seems to know what kind of drive signal they
require. One Tek part currently on eBay, 067-0681-01, even Tektronix
seems to know nothing about. (Thanks a lot, Tek.) Is any information
available? I wouldn't be averse to building one, if I had a reliable
design.


TEK TD pulsers needed about 70-100V to drive them.A TEK 106 or PG506
hi- amplitude output was used to drive them.Rise time was IIRC;1 ns.

that 067-0681-01 is just a pot,3 1K 1/8w resistors and a TD inside a
nice cast aluminum box with BNC's.

I -used- to have the schematic,when I was at TEK.

I even built my own pulser;if I find it,I'll open it up and copy it
down,and post it here or in alt.binaries.schematics.


As far as I recall the pulser was wired something like this

v.pot 1K 1K 1K
input BNC>---/\/\/\/------/\/\/---/\/\/\--/\/\/\---> BNC
|
|
[TD]
|
gnd

keep all leads short.Maybe build it on a PCB.
(the TEK pulser was point-point wired.)

I can't recall the pot value. adjust pot to where the TD -just- triggers.

3K output impedance? That doesn't look right. The step at the TD will
only be about half a volt.

John

Jim Yanik
Guest

Fri Feb 06, 2009 6:30 pm   



Jim Yanik <jyanik_at_abuse.gov> wrote in
news:Xns9BAA726962FD9jyanikkuanet_at_74.209.136.83:

Quote:
Jim Yanik <jyanik_at_abuse.gov> wrote in
news:Xns9BAA70994D117jyanikkuanet_at_74.209.136.83:

Palinurus <disscourn_at_oplink.net> wrote in
news:2bydnTC8Sr7xtBHUnZ2dnUVZ_trinZ2d_at_posted.oplink:

I have need to generate an extremely fast pulse to characterize the
rise time of oscilloscopes, and am disinclined (read "unable") to
spend the $Ks to buy a full-fledged scope calibrator. I notice that
there are occasionally tunnel diode pulse heads available used or
surplus, but nobody seems to know what kind of drive signal they
require. One Tek part currently on eBay, 067-0681-01, even Tektronix
seems to know nothing about. (Thanks a lot, Tek.) Is any information
available? I wouldn't be averse to building one, if I had a reliable
design.


TEK TD pulsers needed about 70-100V to drive them.A TEK 106 or PG506
hi- amplitude output was used to drive them.Rise time was IIRC;1 ns.

that 067-0681-01 is just a pot,3 1K 1/8w resistors and a TD inside a
nice cast aluminum box with BNC's.

I -used- to have the schematic,when I was at TEK.

I even built my own pulser;if I find it,I'll open it up and copy it
down,and post it here or in alt.binaries.schematics.


As far as I recall the pulser was wired something like this

v.pot 1K 1K 1K
input BNC>---/\/\/\/------/\/\/---/\/\/\--/\/\/\---> BNC
|____| |
|
[TD]
|
gnd

keep all leads short.Maybe build it on a PCB.
(the TEK pulser was point-point wired.)

I can't recall the pot value. adjust pot to where the TD -just- triggers.


the TD connects -between- the pot and 1K string.
the ASCII "schematic" didn't appear right when I read my own post.

--
Jim Yanik
jyanik
at
kua.net

cassiope
Guest

Fri Feb 06, 2009 7:45 pm   



On Feb 6, 8:40 am, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
Quote:
On 6 Feb 2009 16:14:49 GMT, Jim Yanik <jya...@abuse.gov> wrote:



Jim Yanik <jya...@abuse.gov> wrote in
news:Xns9BAA70994D117jyanikkuanet_at_74.209.136.83:

Palinurus <dissco...@oplink.net> wrote in
news:2bydnTC8Sr7xtBHUnZ2dnUVZ_trinZ2d_at_posted.oplink:

I have need to generate an extremely fast pulse to characterize the
rise time of oscilloscopes, and am disinclined (read "unable") to
spend the $Ks to buy a full-fledged scope calibrator. I notice that
there are occasionally tunnel diode pulse heads available used or
surplus, but nobody seems to know what kind of drive signal they
require. One Tek part currently on eBay, 067-0681-01, even Tektronix
seems to know nothing about. (Thanks a lot, Tek.) Is any information
available? I wouldn't be averse to building one, if I had a reliable
design.

TEK TD pulsers needed about 70-100V to drive them.A TEK 106 or PG506
hi- amplitude output was used to drive them.Rise time was IIRC;1 ns.

that 067-0681-01 is just a pot,3 1K 1/8w resistors and a TD inside a
nice cast aluminum box with BNC's.

I -used- to have the schematic,when I was at TEK.

I even built my own pulser;if I find it,I'll open it up and copy it
down,and post it here or in alt.binaries.schematics.

As far as I recall the pulser was wired something like this

              v.pot          1K       1K     1K
input BNC>---/\/\/\/------/\/\/---/\/\/\--/\/\/\---> BNC
                       |                    
                       |
                      [TD]
                       |
                      gnd

keep all leads short.Maybe build it on a PCB.
(the TEK pulser was point-point wired.)

I can't recall the pot value. adjust pot to where the TD -just- triggers..

3K output impedance? That doesn't look right. The step at the TD will
only be about half a volt.

John

If you reverse the "input" and "output" BNCs, it will work much
better Wink

Palinurus
Guest

Sat Feb 07, 2009 1:03 am   



<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
John Larkin wrote:
<blockquote cite="mid:8vnoo4p2hgir49sm5tm4fuupk2f88mg3f7_at_4ax.com"
type="cite">
On Fri, 06 Feb 2009 06:13:30 -0600, Palinurus <disscourn_at_oplink.net>

wrote:


<blockquote type="cite">
I have need to generate an extremely fast pulse to characterize the rise 

time of oscilloscopes, and am disinclined (read "unable") to spend the
$Ks to buy a full-fledged scope calibrator. I notice that there are
occasionally tunnel diode pulse heads available used or surplus, but
nobody seems to know what kind of drive signal they require. One Tek
part currently on eBay, 067-0681-01, even Tektronix seems to know
nothing about. (Thanks a lot, Tek.) Is any information available? I
wouldn't be averse to building one, if I had a reliable design.

</blockquote>
<!---->

You can probably drive it from a standard pulse generator. But TD
pulsers make ugly waveforms... a slow rise, then a fast jump, then a
slow drool to finish up. I vaguely recall that that particular box may
be slow.

A fast logic gate (NC7NZ34) or LVDS receiver (SN65LVDSDCBR), properly
grounded and bypassed, will make a clean sub-ns step output without
the TD artifacts.

How fast do you need?

John


</blockquote>
-

&nbsp;&nbsp;&nbsp; About 1 ns. This is just to characterize the rise time of yer
average, garden-variety scopes. We used to have such a thing, as part
of a Fluke 5500, but a nuby managed to blow it up, and management
doesn't want to spring for repairs. As to the logic gates mentioned
above - would I need to know anything special about the geometry of the
layout? It's rather out of my line.



</body>
</html>

John Larkin
Guest

Sat Feb 07, 2009 1:52 am   



On Fri, 6 Feb 2009 10:08:41 -0800 (PST), cassiope
<fpm_at_u.washington.edu> wrote:

Quote:
On Feb 6, 8:40 am, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On 6 Feb 2009 16:14:49 GMT, Jim Yanik <jya...@abuse.gov> wrote:



Jim Yanik <jya...@abuse.gov> wrote in
news:Xns9BAA70994D117jyanikkuanet_at_74.209.136.83:

Palinurus <dissco...@oplink.net> wrote in
news:2bydnTC8Sr7xtBHUnZ2dnUVZ_trinZ2d_at_posted.oplink:

I have need to generate an extremely fast pulse to characterize the
rise time of oscilloscopes, and am disinclined (read "unable") to
spend the $Ks to buy a full-fledged scope calibrator. I notice that
there are occasionally tunnel diode pulse heads available used or
surplus, but nobody seems to know what kind of drive signal they
require. One Tek part currently on eBay, 067-0681-01, even Tektronix
seems to know nothing about. (Thanks a lot, Tek.) Is any information
available? I wouldn't be averse to building one, if I had a reliable
design.

TEK TD pulsers needed about 70-100V to drive them.A TEK 106 or PG506
hi- amplitude output was used to drive them.Rise time was IIRC;1 ns.

that 067-0681-01 is just a pot,3 1K 1/8w resistors and a TD inside a
nice cast aluminum box with BNC's.

I -used- to have the schematic,when I was at TEK.

I even built my own pulser;if I find it,I'll open it up and copy it
down,and post it here or in alt.binaries.schematics.

As far as I recall the pulser was wired something like this

              v.pot          1K       1K     1K
input BNC>---/\/\/\/------/\/\/---/\/\/\--/\/\/\---> BNC
                       |                    
                       |
                      [TD]
                       |
                      gnd

keep all leads short.Maybe build it on a PCB.
(the TEK pulser was point-point wired.)

I can't recall the pot value. adjust pot to where the TD -just- triggers.

3K output impedance? That doesn't look right. The step at the TD will
only be about half a volt.

John

If you reverse the "input" and "output" BNCs, it will work much
better Wink

Except that you can't push a decent edge through a pot.

Most of the TD pulsers I've seen had a circa 50 ohm resistor between
the TD and the output.

One nice thing is the little Tek box that has a blocking oscillator,
pretrigger delay line, < 30 ps TD step generator, and a battery
inside. They show up on ebay now and then. GR 874 connectors. I have a
couple around here somewhere... 067-0513-00.

It shouldn't be hard to booger an old S52 pulse generator head to work
standalone. It has a < 25 ps TD step generator with SMA output. The
old Tek 1S2 also had a nice TD pulser inside, if you can find a
junker.

John

DaveM
Guest

Sat Feb 07, 2009 3:01 am   



"John Larkin" <jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote in message
news:tclpo4thg2epte7hhjt2afsbde55qvsvu4_at_4ax.com...
Quote:
On Fri, 6 Feb 2009 10:08:41 -0800 (PST), cassiope
fpm_at_u.washington.edu> wrote:

On Feb 6, 8:40 am, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On 6 Feb 2009 16:14:49 GMT, Jim Yanik <jya...@abuse.gov> wrote:



Jim Yanik <jya...@abuse.gov> wrote in
news:Xns9BAA70994D117jyanikkuanet_at_74.209.136.83:

Palinurus <dissco...@oplink.net> wrote in
news:2bydnTC8Sr7xtBHUnZ2dnUVZ_trinZ2d_at_posted.oplink:

I have need to generate an extremely fast pulse to characterize the
rise time of oscilloscopes, and am disinclined (read "unable") to
spend the $Ks to buy a full-fledged scope calibrator. I notice that
there are occasionally tunnel diode pulse heads available used or
surplus, but nobody seems to know what kind of drive signal they
require. One Tek part currently on eBay, 067-0681-01, even Tektronix
seems to know nothing about. (Thanks a lot, Tek.) Is any information
available? I wouldn't be averse to building one, if I had a reliable
design.

TEK TD pulsers needed about 70-100V to drive them.A TEK 106 or PG506
hi- amplitude output was used to drive them.Rise time was IIRC;1 ns.

that 067-0681-01 is just a pot,3 1K 1/8w resistors and a TD inside a
nice cast aluminum box with BNC's.

I -used- to have the schematic,when I was at TEK.

I even built my own pulser;if I find it,I'll open it up and copy it
down,and post it here or in alt.binaries.schematics.

As far as I recall the pulser was wired something like this

v.pot 1K 1K 1K
input BNC>---/\/\/\/------/\/\/---/\/\/\--/\/\/\---> BNC
|
|
[TD]
|
gnd

keep all leads short.Maybe build it on a PCB.
(the TEK pulser was point-point wired.)

I can't recall the pot value. adjust pot to where the TD -just- triggers.

3K output impedance? That doesn't look right. The step at the TD will
only be about half a volt.

John

If you reverse the "input" and "output" BNCs, it will work much
better ;)

Except that you can't push a decent edge through a pot.

Most of the TD pulsers I've seen had a circa 50 ohm resistor between
the TD and the output.

One nice thing is the little Tek box that has a blocking oscillator,
pretrigger delay line, < 30 ps TD step generator, and a battery
inside. They show up on ebay now and then. GR 874 connectors. I have a
couple around here somewhere... 067-0513-00.

It shouldn't be hard to booger an old S52 pulse generator head to work
standalone. It has a < 25 ps TD step generator with SMA output. The
old Tek 1S2 also had a nice TD pulser inside, if you can find a
junker.

John


I have one of the 067-0513-00 pulsers here. As John says, it has a 30 ps
risetime, 0.4V output pulse. It has no input; generates its own pulse, complete
with pretrigger output. Runs from a 22V battery, or build your own small power
supply. It only draws about 1.5ma, so almost any 22V source can run it. If
you're interested in the documentation, I'll post it on A.B.S.E.

--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)

Life is like a roll of toilet paper; the closer it gets to the end, the faster
it goes.

Robert Baer
Guest

Sat Feb 07, 2009 8:50 am   



Palinurus wrote:

Quote:
I have need to generate an extremely fast pulse to characterize the rise
time of oscilloscopes, and am disinclined (read "unable") to spend the
$Ks to buy a full-fledged scope calibrator. I notice that there are
occasionally tunnel diode pulse heads available used or surplus, but
nobody seems to know what kind of drive signal they require. One Tek
part currently on eBay, 067-0681-01, even Tektronix seems to know
nothing about. (Thanks a lot, Tek.) Is any information available? I
wouldn't be averse to building one, if I had a reliable design.
There is another way, used before Dr. Esaki discovered and explained

the diode that bears his name; a magnificent discovery and discourse and
advancement in solid state physics.
This other scheme is also solid state; it is a small variation of the
relay.
Use a mercury-wetted reed relay; put in the middle of a coax
enclosure and engineered to retain a 50-ohm profile on all transitions
between solid core to relay and back, the system can achieve
sub-nanosecond transistions.
If you make a window thru the outer enclosure so as to view the
contact, and charge an open cable on one end to a high voltage, when the
relay closes, a coincendent pulse of light comes out of that window
(PW=2*linelength) and can be used to characterize PMTs; called a Huggins
Lamp.
The other end, of course, gives a nice electrical pulse of the same
width and transistion speeds that can be used to trigger the scope
viewing the PMT output.
Tek made some mercury-wetted reed pulse generators (no Huggins lamps
AFAIK).

dougfgd@gmail.com
Guest

Sat Feb 07, 2009 12:45 pm   



On Feb 7, 7:50 am, Robert Baer <robertb...@localnet.com> wrote:
Quote:
Palinurus wrote:
I have need to generate an extremely fast pulse to characterize the rise
time of oscilloscopes, and am disinclined (read "unable") to spend the
$Ks to buy a full-fledged scope calibrator. I notice that there are
occasionally tunnel diode pulse heads available used or surplus, but
nobody seems to know what kind of drive signal they require. One Tek
part currently on eBay, 067-0681-01, even Tektronix seems to know
nothing about. (Thanks a lot, Tek.) Is any information available? I
wouldn't be averse to building one, if I had a reliable design.

   There is another way, used before Dr. Esaki discovered and explained
the diode that bears his name; a magnificent discovery and discourse and
advancement in solid state physics.
   This other scheme is also solid state; it is a small variation of the
relay.
   Use a mercury-wetted reed relay; put in the middle of a coax
enclosure and engineered to retain a 50-ohm profile on all transitions
between solid core to relay and back, the system can achieve
sub-nanosecond transistions.
   If you make a window thru the outer enclosure so as to view the
contact, and charge an open cable on one end to a high voltage, when the
relay closes, a coincendent pulse of light comes out of that window
(PW=2*linelength) and can be used to characterize PMTs; called a Huggins
Lamp.
   The other end, of course, gives a nice electrical pulse of the same
width and transistion speeds that can be used to trigger the scope
viewing the PMT output.
   Tek made some mercury-wetted reed pulse generators (no Huggins lamps
AFAIK).

If you go back 35? years Scientific American Amateur Scientist (back
pages) did a picosecond pulse (rise and fall) generator employing a
double sided PCB unetched as the charge store and the mercury wetted
relay as the short generator.
Should work with transistor in avalanche mode

Winfield Hill
Guest

Sat Feb 07, 2009 4:45 pm   



John Larkin wrote:

Quote:
A fast logic gate (NC7NZ34) or LVDS receiver (SN65LVDSDCBR),
properly grounded and bypassed, will make a clean sub-ns step
output without the TD artifacts.

What's a SN65LVDSDCBR? I know you like the
65LVDS2 -- running on 3.3V? With a say 22-ohm
output resistor for a 50 ohm coax and termination
(Zout looks about 27 ohms - see ds fig 9 and 10)?

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