[Ronja] Trying out a FPGA

[Arun Krishnan]

Hi.

http://bleesmrt.hopto.org/~ladmanj/spider/

Regards,
Arun


----- Original message -----
From: "eldis" <eldis111 at seznam.cz>
To: "Twibright Ronja" <ronja at lists.pointless.net>
Date: Sat, 15 Mar 2008 22:30:57 +0100
Subject: Re: [Ronja] Trying out a FPGA

Very important thing - ADC/DAC must be High-speed..
I assume, that you are talking about Spartan-IIIE Starter kit - look at 
manual, it will be way too slow.

eldis

> Thanks for the info Gregory,
>  
> It does have an integrated ADC/ DAC,  I will discuss the possibility 
> with my instructors...
>  
> By the way does anyone have the link for the spider project?
>  
> Thanks
>  
> Saad
>
> */Gregory Maxwell <gmaxwell at gmail.com>/* wrote:
>
>     On Thu, Mar 13, 2008 at 3:00 PM, Saad Shakeel
>     wrote:
>     > Hi everyone,
>     >
>     > Just got a SPARTAN 3-E FPGA..... and was wondering if i can
>     implement the
>     > some parts of the RONJA on it as well....
>     > I came across the SPIDER project, which was implemented on a
>     CPLD, but i'm
>     > not sure if a CPLD code is compatible with an FPGA too?
>
>     If you have a DAC and ADC chips you could implement the pretty much a
>     complete signal chain... QAM (de)modulation on the FPGA, error
>     correction, equalization, etc.
>
>     A ronja type device could consist of little more than:
>
>     [ethernet mac] - [fpga] - [dac] - [voltage to current amp] - [Tx LED]
>     - [adc] - [preamp] - [RX sensor]
>     - [small dac] / < AGC
>
>     A digital signal chain like this is, in my opinion, the most cost
>     effective way to achieve speeds of 100mbit without switching to laser
>     diodes.
>
>     QAM 16 would should be able to fit 100mbit into the (post
>     equalization) bandpass or the LEDs being used for 10mbit ronja today,
>     though I do not know what the SNR is like on real paths.
>
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