[USRP-users] USRP N210 half-band rx filters

Perelman Nathan (Nathan) nperelman at LGSInnovations.com
Mon Sep 30 16:58:32 EDT 2013


I'm attempting to decipher when each half-band rx filter is active in
the N210 receive chain. In looking at 

http://code.ettus.com/redmine/ettus/projects/uhd/repository/revisions/ma
ster/entry/host/lib/usrp/cores/rx_dsp_core_200.cpp

http://code.ettus.com/redmine/ettus/projects/uhd/repository/revisions/ma
ster/entry/fpga/usrp2/sdr_lib/ddc_chain.v

 

It looks to me like the larger halfband (enable_hb2) is active if the
decimation is a multiple of 2 and both (enable_hb1 and enable_hb2) are
active if the decimation is a multiple of 4. Is this correct? Thanks.
(Also, it'd probably be easier to understand if hb1 and hb2 were used in
the cpp file to match the .v.)

-Nathan Perelman

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