Re: [Discuss-gnuradio] USRP and RFX2400 block diagrams

[Angilberto Muniz Sb]

Eric,
If we start usrp_siggen.py, for instance, and set -f 0
(zero) or no frequency at all, what blocks gets
activated?

Angilberto.

--- Eric Blossom <address@hidden> wrote:

> On Wed, Aug 30, 2006 at 01:28:33PM -0400, Lee Patton
> wrote:
> > On Wed, 2006-08-30 at 06:56 +0000, Eric Blossom
> wrote:
> > > On Tue, Aug 29, 2006 at 10:08:47PM -0400, Lee
> Patton wrote:
> > > > I've taken a shot at coming up with block
> diagrams for the USRP and
> > > > RFX2400.  The diagram for the USRP is the
> result of information I've
> > > > gleaned from different messages in the list,
> data sheets, and block
> > > > diagrams created by other GNU Radio users
> (specifically, Achilleas
> > > > Anastasopoulos).  The RFX2400 diagram was
> created from Matt's drawings
> > > > and associated data sheets. 
> > > > 
> > > > The diagrams can be found here:
> > > > http://www.pattoncentral.org/gnuradio/diagram/
> > > 
> > > Nice diagrams! Thanks!
> > 
> > Glad to.
> > 
> > > Here are a couple of tweaks:
> > > 
> > > The digital down-conversion should show a single
> complex multiplier
> > > instead of two real multipliers.
> > 
> > Thanks. I'll make the change.  A complex
> multiplier is just a more
> > efficient digital version of what I've drawn,
> right?
> 
> No.  They're not equivalent.  The naive complex
> multiplier has 4 real
> mulitipliers and two adders:
> 
>   (a + bj) * (c + dj) = (ac - bd) + (ad + bc)j 
> 
> > > Same comment on the digital up-conversion. 
> We've got "Block D"
> > > enabled in the AD9862, thus it's functioning as
> a complex multiplier.
> > 
> > Okay. Out of curiosity, is "Block B" enabled too?
> 
> Yes, if it needs to be.
> 
> Eric
> 
> 
> 
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> 


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