Re: [ARTIQ] ARTIQ hardware proposal
I agree that not stuffing ADC does not make things worthwhile. How about considering a DSP breakout board similar to the standalone digital box? This, obviously, is another piece of hardware need to be maintained. But I think this makes more sense for the application of laser stabilization, i.e. you want the servo controller physically closer to your laser system rather than have all of them sitting inside a crate. I am not very clear about the analog FMC card (item 6) as it is not indicated in the 'system overview' diagram. Is this basically a DSP breakout board? Also, how about considering a 2:1 DAC to ADC channels ratio for DSP? I think most experiments prefer more output than input. Ting Rei -Original Message- From: Robert Jördens [mailto:jord...@gmail.com] Sent: Saturday, March 19, 2016 3:10 PM To: Tan, Ting Rei (IntlAssoc) <tingrei@nist.gov> Cc: artiq@lists.m-labs.hk Subject: Re: [ARTIQ] ARTIQ hardware proposal On Sat, Mar 19, 2016 at 8:54 PM, Tan, Ting Rei (IntlAssoc) <tingrei@nist.gov> wrote: > For complicated trap users, the most common use case is to drive trap > electrode so we will need much more DAC channels and ADC channels. One > possible solution is to have two kind of DSP boards? One with balanced > DAC and ADC channels and the other with only DAC. Specifying, designing, producing, stocking, and selling more boards just to get variations is quite time consuming and expensive. Two things to consider here: We can probably do a run where the ADCs are not populated. But you won't get more DAC channels and the amount of money saved might not make it worth the trouble. Also for "many DAC channels" we will probably end up needing to do hardware anyway. -- Robert Jordens. ___ ARTIQ mailing list https://ssl.serverraum.org/lists/listinfo/artiq
Re: [ARTIQ] ARTIQ hardware proposal
On Sat, Mar 19, 2016 at 8:54 PM, Tan, Ting Rei (IntlAssoc)wrote: > For complicated trap users, the most common use case is to drive trap > electrode so we will need much more DAC channels and ADC channels. One > possible solution is to have two kind of DSP boards? One with balanced DAC > and ADC channels and the other with only DAC. Specifying, designing, producing, stocking, and selling more boards just to get variations is quite time consuming and expensive. Two things to consider here: We can probably do a run where the ADCs are not populated. But you won't get more DAC channels and the amount of money saved might not make it worth the trouble. Also for "many DAC channels" we will probably end up needing to do hardware anyway. -- Robert Jordens. ___ ARTIQ mailing list https://ssl.serverraum.org/lists/listinfo/artiq
Re: [ARTIQ] ARTIQ hardware proposal
On Sat, Mar 19, 2016 at 12:09 PM, Sébastien Bourdeauducqwrote: > What about grounding the FMC pins near the analog signals, would that help? Yes. This is also what the USRP hardware does. And FMC does ground shielding for its regular digital pairs as well. Given that nobody seems to have done analog over the FMC connector, it would be useful to measure the pair-to-pair coupling on a FMC prototype board and then alternatively (and in any case if RFI requires caging) use separate shielded connectors. It wouldn't be too ugly because mounting an FMC already needs more than just fingers. Robert. ___ ARTIQ mailing list https://ssl.serverraum.org/lists/listinfo/artiq
Re: [ARTIQ] ARTIQ hardware proposal
On Friday, 18 March 2016 4:27:53 PM HKT Ben Keitch wrote: > This gives me a 404: > > http://ssl.serverraum.org/lists-archive/artiq/attachments/20160318/ce9d656c/ > attachment.pdf This links works fine here. Anyway, here is the slightly updated version. Change log: https://github.com/m-labs/artiq-hardware Sébastien artiq_hardware.pdf Description: Adobe PDF document ___ ARTIQ mailing list https://ssl.serverraum.org/lists/listinfo/artiq
[ARTIQ] ARTIQ hardware proposal
Hi, I've been collecting ideas about the new hardware we've been talking about for a while. Please see the attached document and let me know what you think. Sébastien artiq_hardware.pdf Description: Adobe PDF document ___ ARTIQ mailing list https://ssl.serverraum.org/lists/listinfo/artiq