Author Topic: EEVblog #306 - Jim Williams Pulse Generator (Read 308961 times)

free_electron · « **Reply #225 on:** February 14, 2013, 03:24:50 pm »

Looks right to me.

G7PSK · « **Reply #226 on:** February 14, 2013, 03:28:42 pm »

I make it 44$ for the UK 22$ X1 Kit
05$ Cal.
17$ International post.

free_electron · « **Reply #227 on:** February 14, 2013, 04:22:14 pm »

The 'LIST' -updated FEB15 8AM PST-

Sagan's fund is already at 20 125 US$

This will be updated with more info as we go.

current status :

- if you're not on the list or have not received the PM: post below or send me a PM ASAP so i can add you and send instructions

- When i get the paypal information in i will update your line with the exact mixture you ordered ( don't worry if it is wrong right now , we go by the paypal order.) and the text -PAID- will appear behind the PM mark. At that point your order is sealed. Doublecheck i got the right mix, or you didn't mess up (like EV.. ordering 2xkit but paying for 2xcal

) i am human... albeit slightly.

***WINNER*** G7PSK was the first to pay.

- as soon as your box is handed off to USPS the text -SHIPPED- will appear as well.

I have spare kits and boards so if you want to 'up' you can do so during the paypal transaction. i will update the table accordingly.

The jazz is on (as hannibal used to say)

Kit : CAL : PCB: PM : PAID : SHIPPED
alfbaz : 2x : 3x : pm : PAID :
andyturk : 1x : : pm : PAID :
Barryg41 : 1x : : PM : PAID :
biot : 1x : : PM : PAID :
BravoV 1x : 1x : : PM : PAID : with BFG
blackknife 1x : : : pm : :
casinada : 1x : : pm : PAID :
circuitous : 1x : : pm : PAID :
Christe4nM : 1x : 1x : pm : PAID :
condor : 1x : : pm : PAID :
cyr : 1x : : pm : PAID :
echo88 1x : 1x : : pm : :
enz : 1x : : pm : PAID :
EV : 2x : : pm : PAID :
fmaimon 1x : 1x : : pm : PAID : bfg
g7psk : 1x : : PM : PAID :
gibbled 1x : : 1x : pm : PAID :
grenert : : : pm : :
komet : PM : :
marshallh : 1x : : pm : PAID :
nadona : 1x : : pm : PAID :
Neganur : 2x : : pm : PAID :
noize : 1x : : PM : :
olegjay : 2x : 2x : pm : PAID :
olepr01@gmail.com 1x : : : pm : :
plesa 1x : : 1x : pm : :
robrenz : 1x : : pm : :
sdscotto : 2x : 1x : pm : :
Spelunker 1x : : : pm : :
suba 1x : 1x : : PM : :
teneyes 1x : 1x : : pm : PAID :
Tymm : 2x : 1x : pm : PAID :
Wsalden 1x : : : pm : :

------------------------------------
11x : 31x : 10x

EV · « **Reply #228 on:** February 14, 2013, 06:00:11 pm »

Quote from: free_electron on February 14, 2013, 03:16:53 pm

I'll send people a message through the forum

OK, I am waiting your message!

olegjay · « **Reply #229 on:** February 14, 2013, 06:29:09 pm »

Hi free_electron,

You have me down in your list for a total of just 1 kit (as per my initial request sent 1/19/2013 msg). But I modified my request on my 1/20/2013 msg (Reply #204) to a total of "2 Calibrated and 2 bareboards". Can I pay and get the final request (2 calib & 2 bare)?

free_electron · « **Reply #230 on:** February 14, 2013, 06:41:00 pm »

jep. no problem. i have spares.

Like is said : if you want a different mix simply pay what you want . i will update the table above based ont he paypal transaction. i have extra boards and parts so it's no problem.

BravoV · « **Reply #231 on:** February 16, 2013, 12:34:09 am »

Hey Vincent, just curios what scope you're planning to use to generate the plot for CAL unit ?

Also want to say I really appreciate this really nice extra service you provided, thank you.

free_electron · « **Reply #232 on:** February 16, 2013, 01:00:15 am »

The stuff dreams is made off : a 33GHz bandwidth, 80Gs/s DSA-X93204A courtesy of Agilent. I called in a favor...

-WARNING- If you go look that model up make sure you sit down before your eyes wander to the right of the screen where the price is stated ... this is beyond eye-watering territory. Many people live in houses that are cheaper than that...

That should state beyond a figment of doubt what the pulser really does as rise time , and, that whatever pulse you see on YOUR scope when you attach the pulse generator is caused by the bandwidth limitation of your scope.

BravoV · « **Reply #233 on:** February 16, 2013, 01:16:40 am »

Damn, I drolled big time just seeing the spec ...

- 80 GSa/s sample rate
- 50 Mpts per channel
- noise floor 2.15 mVrms at 33 GHz at 50mV/div
- jitter measurement floor <100 fS

Now, you've made my patience nerve shrink thinner, just can't wait to receive mine.

free_electron · « **Reply #234 on:** February 17, 2013, 01:50:29 am »

Success !. i just built prototype 1. fully working. the stripline also works nicely. i get a 5ns pulse with a very sharp rise time.
screencaptures below

first picture is the built assembly
second picture in the regular version
thrid picture using the backside stripline. this gives a 5nS pulse.

Note : this is measured using my older 600MHz Infiniium 54831A. So that rise time is way faster. I am going to assemble all of them using the stripline.

BravoV · « **Reply #235 on:** February 17, 2013, 02:19:43 am »

Glad to see the new revision with the stripline works, great news !

casinada · « **Reply #236 on:** February 17, 2013, 05:36:53 am »

Are you using more than one adapter to connect the pulser to the scope?
BNC-M - SMA-F to SMA-M - SMA-M to Pulser ?
Thank you

BravoV · « **Reply #237 on:** February 17, 2013, 06:58:46 am »

Quote from: casinada on February 17, 2013, 05:36:53 am

Are you using more than one adapter to connect the pulser to the scope?
BNC-M - SMA-F to SMA-M - SMA-M to Pulser ?
Thank you

I believe using sma male to bnc male is enough.

free_electron · « **Reply #238 on:** February 17, 2013, 03:40:48 pm »

I didn't have the right one laying around... (I know i have some, couldn't find them). Oh, and i also forgot to put the scope in 50 ohm.... I took new pictures with the scope in 50 ohm mode and the ringing at the top is almost gone. There is still a 'step' at the tail. But you get a nice 5ns pulse with razorsharp risetime. I've built the first 20 and they all work. Today i'm out but i'll post the screencaptures tonight. I'll hook up my 1Ghz machine tonight. I'll try to get rid of the step at the end as well.

Jay_Diddy_B · « **Reply #239 on:** February 17, 2013, 03:56:01 pm »

Hi,
When you borrow the very expensive Agilent scope, don't forget to use an attenuator. The typical amplitude of the 2N2369A pulser will damage the input which is 5V max.

Jay_Diddy_B

free_electron · « **Reply #240 on:** February 18, 2013, 06:08:16 am »

I'll be using their active probes. Those can handle the pulse.

notsob · « **Reply #241 on:** February 18, 2013, 07:27:53 am »

Hey Vincent, have you compared the 2N against the BFG version.

Just curious

Peter

BravoV · « **Reply #242 on:** February 18, 2013, 08:19:02 am »

Quote from: notsob on February 18, 2013, 07:27:53 am

Hey Vincent, have you compared the 2N against the BFG version.

Just curious

Peter

<sigh> ... I've been dying just to see how it performs for quite some time now ...

free_electron · « **Reply #243 on:** February 18, 2013, 04:00:59 pm »

I do t have the bfg transistors yet. Need to order them.

free_electron · « **Reply #244 on:** February 18, 2013, 05:09:59 pm »

Update

Kit : CAL : PCB: PM : PAID : SHIPPED
alfbaz : 2x : 3x : pm : PAID :
andyturk : 1x : : pm : PAID :
Barryg41 : 1x : : PM : PAID :
biot : 1x : : PM : PAID :
BravoV 1x : 1x : : PM : PAID : with BFG
blackknife 1x : : : pm : :
casinada : 1x : : pm : PAID :
circuitous : 1x : : pm : PAID :
Christe4nM : 1x : 1x : pm : PAID :
condor : 1x : : pm : PAID :
cyr : 1x : : pm : PAID :
echo88 1x : 1x : : pm : PAID :
enz : 1x : : pm : PAID :
EV : 2x : : pm : PAID :
fmaimon 1x : 1x : : pm : PAID : bfg
g7psk : 1x : : PM : PAID :
gibbled 1x : : 1x : pm : PAID :
grenert : 1x : : pm : PAID :
komet : 1X : : PM : PAID :
marshallh : 1x : : pm : PAID :
nadona : 1x : : pm : PAID :
Neganur : 2x : : pm : PAID :
noize : 1x : : PM : paid :
olegjay : 2x : 2x : pm : PAID :
olepr01@gmail.com 1x : : : pm : PAID :
plesa 1x : : 1x : pm : PAID :
robrenz : 1x : : pm : PAID :
sdscotto : 2x : 1x : pm : :
Spelunker 1x : : : pm : :
sCuba 1x : 1x : : PM : PAID :
teneyes 1x : 1x : : pm : PAID :
Tymm : 2x : 1x : pm : PAID :
Wsalden 2x : : : pm : PAID :

sagan's fund is at 150$ now.

free_electron · « **Reply #245 on:** February 22, 2013, 05:46:46 am »

Tomorrow is D-Day

Camera charged, memory erased - check
Memory stick - check
SMA cables Semi rigid 10 Ghz - Check
Box with pre-tested pulsers - check
test jig - check
attenuator - check
agilent t-shirt -check

i will visit the museum as well . i'll post photo's

BravoV · « **Reply #246 on:** February 22, 2013, 06:06:58 am »

Sharpie - checked ?

free_electron · « **Reply #247 on:** February 22, 2013, 06:40:50 am »

they are already marked both on the pcb and antistatic bags. i'll scavenge an Agilent pen >

SeanB · « **Reply #248 on:** February 22, 2013, 04:28:20 pm »

Scavenge a box, and send one with each meter........

free_electron · « **Reply #249 on:** February 22, 2013, 09:39:54 pm »

And the results are in! They range from 170pS to 210pS for a 8 vpp pulse measured at 20 to 80% into 50 ohm.

So the JW pulser is faster than Jim ever was able to measure. We are talking in the 30pS per volt range... Given that agilents calibrator does 15...

It's one hell of a scope!

I got closeups of the a/d converter chip....


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Author Topic: EEVblog #306 - Jim Williams Pulse Generator (Read 308961 times)

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