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Electronics => Projects, Designs, and Technical Stuff => Topic started by: JohnG on October 08, 2018, 07:50:56 pm

Title: Yet another high speed pulse generator (LMG1020)
Post by: JohnG on October 08, 2018, 07:50:56 pm

It won't win points for the fastest, but it will drive 50 ohms to 5V, and probably 10 ohms (have not had a chance to test), in a few hundred ps:http://www.ti.com/product/LMG1020 (http://www.ti.com/product/LMG1020)

Here are some pictures with an RTO1024 (spec'd at 175 ps risetime). Yes, I know there is some ringing.

Not a bad little chip. And no, I don't work for TI...

John

Title: Re: Yet another high speed pulse generator (LMG1020)
Post by: awallin on October 09, 2018, 04:27:19 am

Looks interesting. For a pulse-distribution amp[1] I am using IDT5PB1108 where 5 outputs are connected in parallell. Each output on the chip is 50R terminated, so the 5 parallell outputs drive about 2.7V into a 50R load - with decent rise-time (~400ps IIRC) - with the drawback that the output isn't 50R matched.

This chip might be a good alternative if higher voltage levels are required?
Would be nice to see a comparison between the LMG and the IDT on the same scope..

[1] https://www.ohwr.org/projects/pda-8ch-fda-8ch/wiki/wiki (https://www.ohwr.org/projects/pda-8ch-fda-8ch/wiki/wiki)