[Discuss-gnuradio] AGC using RXPGA on MxFE

[Ahmad Sheikh]

The USRP user guide states that there is 20 db of gain on the USRP. Assuming 
that this is on the Receive path Programmable Gain Amplifier on the MxFE, can 
this be used as an AGC? I want to control the strength of the signal received. 
The way to do this, I think, would be to dynamically alter the value written to 
the Rx A/Rx B registers, using some feedback control mechanism. Would this 
control be on the FPGA, or GNU Radio Python/C++ software using 
usrp.source_c().set_pga()? Is there already some structure provided to do this?

If anyone has done something similar, I'd appreciate some information.

Thanks,
Ahmad

----- Original Message -----
From: "Eric Blossom" <address@hidden>
To: "Ahmad Sheikh" <address@hidden>
Subject: [Discuss-gnuradio] Re: FPGA Verilog code
Date: Sat, 16 Jul 2005 18:33:25 -0700

> 
> On Fri, Jul 15, 2005 at 06:05:25PM -0500, Ahmad Sheikh wrote:
> > Hi,
> >
> > I am interested in modifying the FPGA code in the USRP, and I 
> > would like to know the procedure used to create the Verilog code. 
> > Was the Verilog code written from scratch, or was some tool, like 
> > MATLAB/Simulink, used to convert signal processing algorithms to 
> > Verilog. If so, can I have access to the MDL files, and any 
> > documentation you might have?
> >
> > Thanks,
> > Ahmad Sheikh
> 
> It was written by hand.
> 
> The top level of the design is usrp/fpga/toplevel/usrp_std/usrp_std.v
> The rest of the code is in usrp/fpga/sdr_lib/*.v
> 
> Eric
> 
> 
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