Gated shaped toneburst - Page 1
Forum section: electronics / testgear

author: jan.didden
author_rank: Newbie
timestamp: December 12, 2022, 01:21:35 pm
content: Hi guys, this one has me stumped. I want to generate a shaped tone burst.A sine wave signal AM modulated, and then gated so that I get a series of say 5 sinewaves of the carrier, each of those bursts am modulated, separated by the gate zero level.I have a two channel Siglent function generator, and I can generate the modulated/shaped tone burst, OR the gated tone burst (which actually is a sine wave modulated by a square wave).But I can't seem to combine it.I tried to use the gated sine wave as external input and modulate it with a sine wave but that doesn't seem te work.Attached is what I am after. Hopefully someone has an idea how to.Jan Didden

author: Marco
author_rank: Super Contributor
timestamp: December 12, 2022, 01:36:56 pm
content: Quote from: jan.didden on December 12, 2022, 01:21:35 pmI don't have the signal generator, but this doesn't really make sense. The logical way to chain it is to have one channel generating a repeating modulated tone and then gate it with a square wave signal from the other channel supplied to the AUX input, not modulate it a second time.Even if your signal generator is an expensive one with external analogue modulation input, it's better to AWG the repetitive shape and binary gate it ... which even the cheap ones supportAFAICS.

author: jan.didden
author_rank: Newbie
timestamp: December 12, 2022, 02:26:36 pm
content: I understand, and that was my first thought as well. But the you cannot gate a signal that's already AM modulated, the user interface isn't set up for that.You can choose between gated or modulated, not both.Maybe my function generator is a too basic model, but I have looked at other's user manuals and what I've seen is that you have only one procession selection, not two.Unless I misunderstand you and miss something. It's happened before ;-)Edit haven't used the ARB but I don't know if you can set it up for a sine-modulated sine.Jan

author: Marco
author_rank: Super Contributor
timestamp: December 12, 2022, 02:43:38 pm
content: That would be my suggestion, see if EasyWave can make the repeating modulated sine for Arb generation and then gate that.

author: jan.didden
author_rank: Newbie
timestamp: December 12, 2022, 03:57:35 pm
content: EasyWaveX installed. I got the basic modulated sine set up, see attached.Now I assume that if I download this to the FuncGen this will be output as a continues signal (don't have the funcgen here right now).Now I have to figure out how to output one ' cycle' of that, wait for am adjustable time, then the next one.This is all new for me so apologies for thinking out loud.Jan

author: voltsandjolts
author_rank: Unknown
timestamp: December 12, 2022, 04:11:26 pm
content: If you use MATLAB orOctavethenthismight help.

author: Marco
author_rank: Super Contributor
timestamp: December 12, 2022, 04:32:00 pm
content: Quote from: jan.didden on December 12, 2022, 03:57:35 pmLooking at the manual, you can use N-Cycle mode with a trigger, use the other channel to generate the trigger.

author: 2N3055
author_rank: Super Contributor
timestamp: December 12, 2022, 04:50:55 pm
content: Quote from: jan.didden on December 12, 2022, 03:57:35 pmHello!What exact model of Siglent AWG you have?Newer models all have Burst capability.You load this very waveform you made,enable Burst mode, set 1 Cycle (what you made is one cycle), and set repetition frequency of the burst.Or set it to manual, where you press button to emit one burst.Or use external trigger where you bring in trigger signal to input trigger BNC on the back of generator..

author: jan.didden
author_rank: Newbie
timestamp: December 12, 2022, 06:09:15 pm
content: I have a very old SDG1020, which I already repaired once when I blew an output driver in Ch. 1.I'm ready to upgrade if necessary.I'll look at it again tomorrow, made some progress today thanks to you guys!Jan

author: 2N3055
author_rank: Super Contributor
timestamp: December 12, 2022, 06:24:50 pm
content: Quote from: jan.didden on December 12, 2022, 06:09:15 pmJan,I took a look at user manual, and your AWG has burst mode and all the features I explained.You should have no problems doing the steps I explained.Let us know how it goes.Best,Sinisa

author: tautech
author_rank: Super Contributor
timestamp: December 12, 2022, 07:01:01 pm
content: A customer with one of the later X models had a similar issue with a complex waveform from which they needed a continuous waveform.The Burst feature and it's settings is the solution.