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MAX_FIR twice the max baseband rate? #11

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mhennerich opened this issue Apr 6, 2018 · 4 comments

Contributor

mhennerich commented Apr 6, 2018

libad9361-iio/ad9361_calculate_rf_clock_chain.c

Line 22 in 93d4a22

#define MAX_FIR MAX_DATA_RATE * 2

Contributor

tfcollins commented Apr 6, 2018 •

edited

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From here: https://github.com/analogdevicesinc/ad936x-filter-wizard/blob/ca68f7d0b041f59fd117a7f55ac05b7f1edfd8ff/rate_bounds.m#L11

I think the comment is just wrong

Contributor

rgetz commented Apr 6, 2018

but that means you can never use FIR which is *4? That doesn't make sense.

Contributor

tfcollins commented Apr 6, 2018 •

edited

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It means that the input to the FIR (on the RX side) cannot exceed 2*61.44MHz

Contributor Author

mhennerich commented Apr 7, 2018

That‘s outdated corrected stuff from the old manual where BB rates of 122.88 were valid in 1rx1tx mode. We need to fix that here too

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