Hello Altug, The CIC can be programed to decimate by a range of integer amounts. If the ratio is 20 (50 MHz sampling rate, 2.5 MHz output rate) then both half bands will be used (divide by 2*2) and the CIC will decimate by 5. Odd CIC rates have poor filter roll off compared to even rates.
Derek On Wed, Jul 19, 2017 at 10:52 AM, altuğ kaya via USRP-users < [email protected]> wrote: > Dear Martin, > > So, CIC's status is a binary one. For example if the ratio is 3, 3%4 = 3 > and because there is a remainder, the CIC is enabled. If the ratio is 20, > both half-bands will be enabled and CIC is disabled as 20%4 = 0. Did I > understand correctly? > > Regards, > Altug > > On Tue, Jul 18, 2017 at 5:59 PM, Martin Braun via USRP-users < > [email protected]> wrote: > >> Altuğ, >> >> per channel, there's 2 half-bands and 1 CIC. The rule is: We try and >> enable as many half-bands as possible, the rest is done by CIC. So, any >> ratio of sample_rate to master_clock_rate that is divisible by 4 has 2 >> half-bands, any other even ratio has 1 half-band, and the remainder is >> done in the CIC. >> >> Cheers, >> Martin >> >> On 07/18/2017 07:55 AM, altuğ kaya via USRP-users wrote: >> > Hello everyone, >> > >> > In B210 there are 2 half-band filters and 4 CIC filters. As far as I >> > know we can select how many filters we would like to use by tuning the >> > ratio between sample_rate and master_clock_rate. What is the rule of it? >> > >> > I am looking forward to your answer, >> > Altug Kaya >> > >> > >> > _______________________________________________ >> > USRP-users mailing list >> > [email protected] >> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > >> >> >> _______________________________________________ >> USRP-users mailing list >> [email protected] >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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