HV/LV jumper setting

Applications, development tools, FPGA, C, WEB
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igttgit
Posts: 15
Joined: Fri Jul 31, 2015 9:22 pm

HV/LV jumper setting

Post by igttgit » Mon May 30, 2016 3:18 pm

Hello developers,
It is known the RP default scope utility has an HV/LV selector to correspond to the jumper settings.
Up to this point I have assumed that this was simply a gain setting, however it seems to be so much more.

When sampling a square wave signal with very high dv/dt I have noticed a "probe compensation"-like overshoot on the LV setting and almost complete elimination of this effect on the HV setting wit hthe scope utility.

My question is, presumably there is a filter on the FPGA to correct this response, what type of filter is this ?
If possible, could a link to the filter coefficients be posted ?

I am making my own acquisition utility and this is the last stumbling block

Nils Roos
Posts: 1441
Joined: Sat Jun 07, 2014 12:49 pm
Location: Königswinter

Re: HV/LV jumper setting

Post by Nils Roos » Mon May 30, 2016 10:57 pm

The old wiki has some information about the digital input filter (including the transfer function), and the parameters are as follows:

KK: 0xd9999a
PP: 0x2666

HV
AA: 0x4c5f
BB: 0x2f38b

LV
AA: 0x7d93
BB: 0x437c7
All in a day's work for Bicycle Repair Man

mnordgard
Posts: 12
Joined: Mon Feb 13, 2017 10:18 am

Re: HV/LV jumper setting

Post by mnordgard » Mon Jan 22, 2018 11:58 am

Now that the old wiki is not accessible, is there any other place one can find this information?

redpitaya
Site Admin
Posts: 227
Joined: Wed Mar 26, 2014 7:04 pm

Re: HV/LV jumper setting

Post by redpitaya » Wed Jan 24, 2018 12:59 pm

hi

this information was moved into a common document which can be found here.

Jumpers are explained there in the Fast analog IO paragraph.

kind regards

Red Pitaya team

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