kumari wrote:
>  Hi
>  i'm new to using Fpga.My project is design of modulator using Fpga based
> on Dsp technology.My data rate is 12Mb and Intermeadiate freq  is 140
> Mhz.
> I decided to use D8psk modulation technique. i want to choose Fpga for
> this design.which parameters have to be considered for choosing fpga. 
> 
> 
You may want to cross-post this question to the fpga newsgroup (I trust 
you haven't multiple-posted).

Scratch out your modulator design as a block diagram, then look at the 
arithmetical operations you're going to be doing and the sampling rate 
you feel you need to achieve.  I suspect there will be a substantial 
number of multiplies, with some phase-to-sine conversions.  This would 
imply you want an FPGA that has multiplier blocks and memory blocks -- 
fortunately these are easy to come by.

Then go looking for an FPGA that's easy to work with.  I can't help you 
here -- my little bit of experience with FPGAs is with Xilinx parts and 
it's a few years old now.  Moreover my choice had more to do with having 
a local circle of friends that includes more people with practical 
Xilinx experience than with other parts, and because the local Xilinx 
app engineer is a friendly and helpful guy.

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

 Hi
 i'm new to using Fpga.My project is design of modulator using Fpga based
on Dsp technology.My data rate is 12Mb and Intermeadiate freq  is 140
Mhz.
I decided to use D8psk modulation technique. i want to choose Fpga for
this design.which parameters have to be considered for choosing fpga.