Maximum output frequency of AWG

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raman
Newbie
Posts: 0
Joined: Wed Jul 28, 2010 12:36 pm

Maximum output frequency of AWG

Why is the maximum output frequency of AWGs is limited to 20MHz if there are 125MS/s and 200MS/s available in 5000 and 6000 series, respectively?

raman
Newbie
Posts: 0
Joined: Wed Jul 28, 2010 12:36 pm

Re: Maximum output frequency of AWG

Well, I think it just because you want to have enough points for your sine wave.
But one could increase the maximum frequency by putting an analog lowpass filter at the output. Is there one already in your AWG? If not, do you think it's possible to add one at the output?

ziko
Posts: 1705
Joined: Fri Dec 01, 2006 10:03 am
Location: St Neots

Re: Maximum output frequency of AWG

Hi,

I put your question across to one of our hadrware engineers and here is what he said:

"The AWG on the 5000 and 6000 products has an output amplifier with a bandwidth of ~40MHz.

Signals faster than 20MHz will show decreased amplitude (triangle and squarewaves become quite rounded) and increased jitter.

As an example we can generate a 100MHz sinewave from a 6000 by importing a csv file with these values;

1
-1
1
-1
1
-1
1
-1
1
-1

The amplitude measures ~370mV when terminated with 50ohm."

I hope this helps.

Kind regards
Ziko

Technical Specialist

raman
Newbie
Posts: 0
Joined: Wed Jul 28, 2010 12:36 pm

Re: Maximum output frequency of AWG

So, it seems to be straightforward to generate sine waves up to 40MHz without loosing amplitude - higher harmonics will be damped by the amplifier. One could still add a lowpass filter to suppress them completely.
By the way, specification for the amplitude is +/-2V: does it mean 4V peak-to-peak?

ziko
Posts: 1705
Joined: Fri Dec 01, 2006 10:03 am
Location: St Neots

Re: Maximum output frequency of AWG

Hi yes it would be 4V peak to peak.

Kind regards
Ziko

Technical Specialist

raman
Newbie
Posts: 0
Joined: Wed Jul 28, 2010 12:36 pm

Thanks!