Re: [Discuss-gnuradio] Required -- DDC Implementation Circuit of USRP

[Eric Blossom]

On Sat, Feb 02, 2008 at 09:09:55PM +0530, Prasanna Rao wrote:
> Hello there..
> 
>   I wanted to have the schematic and possibly, the FPGA implementation code
> of the DDC circuit employed in USRP. I am not a core expert in analyzing all
> of it, just need to understand the basic implementation of DDC for dynamic
> extraction of baseband in channels up to 6MHz in bandwidth.
> 
>   Thanking you in anticipation..
> 
> Regards,
> Prasanna

If you've downloaded the code for GNU Radio, you have all the code
that goes in the FPGA.
usrp/fpga/top_level/usrp_std/usrp_std.v is the top of the design.
The stuff you're looking for is in usrp/fpga/sdr_lib

For schematics, see http://www.gnuradio.org/trac/wiki/USRP

Eric