On Sat, Jun 09, 2007 at 09:43:02AM -0400, Achilleas Anastasopoulos wrote: > After a bit of digging I think I partially > answered my questions. > > Just to make sure I have it right: > > There are 2 complex interpolators implemented in the FPGA (say int0, and > int1). There are 4 real (ie, 2 complex) upconverters implemented in the > DAC chips (say dac0, dac1, dac2, dac3). The mux routes the I and Q > of int0 and int1 to the appropriate dacs. > > Is it true that dac0,1 are hardwired to the TXA side of the USRP and > dac2,3 to the TXB? > > Also, is the second complex interpolator used only if nchannels = 2 ? > > Thanks > Achilleas
Yes. You have it right. Eric > > > Achilleas Anastasopoulos wrote: > > > >I understand the purpose of the mux on the rx side of the usrp. > > > >I have a question regarding the tx side of the usrp. > >In particular, it is not clear to me what the purpose of the mux > >is on the tx side. > >My understanding is that the samples from the USB (say complex) > >are interpolated by N in the FPGA, then further interpolated > >by 4 in the DAC chip (to reach 128Msps), then digitally up-converted and > >then digital-to-analog converted. > > > >where is the Mux in this chain? and what does the default value 152 > >represent? > > > >Thanks > >Achilleas > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
