Pulse generator 150ps 1Vpp - Page 1
Forum section: electronics / projects

author: luky315
author_rank: Regular Contributor
timestamp: July 24, 2012, 09:39:52 am
content: I made a Pulse generator with a pulse width of about 150ps and an Amplitude of approximately 1Vpp. It uses the Step-Recovery Effect of a HF-npn-Transistor and a shorted-out Stub to shape the pulse.Unfortunately (for you) the documentation is in german (https://engineeringarts.wordpress.com/2012/07/24/pulsgenerator-150ps-1vpp/), but I try to answer all questions.

author: Chipset
author_rank: Contributor
timestamp: July 24, 2012, 12:07:23 pm
content: Send one to dave so he can test it with his 13ghz scope.

author: luky315
author_rank: Regular Contributor
timestamp: July 24, 2012, 12:32:04 pm
content: I have only one handmade Prototype.The measurement is made with a LeCroy WAVEMASTER 8620A (20Gs/s) and verrified with an Agilent 86100B (Agilent 86118A 70 GHz Remote Sampling Module), so there is no need to use a slow13GHz Scope

author: Lukas
author_rank: Frequent Contributor
timestamp: July 24, 2012, 01:45:09 pm
content: Can you post the documentation anyway, there are some German members, as well.

author: Chipset
author_rank: Contributor
timestamp: July 24, 2012, 02:15:47 pm
content: It being in german isn't really a problem, pasting it in google translate usually yields readable enough results.

author: Time
author_rank: Frequent Contributor
timestamp: July 24, 2012, 02:58:35 pm
content: Ugly board, beautiful pulse!

author: robrenz
author_rank: Super Contributor
timestamp: July 24, 2012, 03:39:10 pm
content: Doesn't a pulse for this type of measurement need at least a short section reasonably steady state voltage before it drops?

author: ejeffrey
author_rank: Super Contributor
timestamp: July 24, 2012, 03:50:49 pm
content: I can't speak for everyone else, but when I use a pulse generator I typically want either the shortest pulse possible or the fastest step possible holding the 'high' value for at least 10s of nanoseconds. I can't think of a time I have wanted a pulse with 250 ps rise and fall times but a 1.5 ns hold time at the top.

author: luky315
author_rank: Regular Contributor
timestamp: July 24, 2012, 03:55:26 pm
content: This Pulse Generator ist used for Cable testing, not for BW-measurements.But can also be used to test the BW of a scope if you use the Cursors and not the internalRisetime-measurement-function.

author: robrenz
author_rank: Super Contributor
timestamp: July 24, 2012, 04:08:18 pm
content: Quote from: luky315 on July 24, 2012, 03:55:26 pmThat makes sense. Thanks

author: T4P
author_rank: Super Contributor
timestamp: July 24, 2012, 08:10:03 pm
content: 13GHz slow? And what's that POS i see before me anyway(LeCrap)

author: robrenz
author_rank: Super Contributor
timestamp: July 24, 2012, 08:16:06 pm
content: Quote from: Mechatrommer on July 24, 2012, 08:13:44 pmLooks like copper eyelets to me.

author: luky315
author_rank: Regular Contributor
timestamp: July 24, 2012, 08:37:05 pm
content: The Vias are made with a Bungard "Bel Favorit" hand press. They are small (d=0,8mm) copper rivets.

author: robrenz
author_rank: Super Contributor
timestamp: August 03, 2012, 11:24:32 am
content: Quote from: robrenz on July 24, 2012, 04:08:18 pmQuote