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11-08-2019 01:10 AM
Hello,
in the Zynq UltraScale+ RFSoc Data Sheet are the RF-ADC Features listed.
Its written that the decimation filters have 80% pass band. What exactly does that mean? Is that a low pass filter with cut-off frequency at 80% of the nyquist frequency? Or is that a wrong interpretation?
Thanks for your help!
Best,
Philipp
11-08-2019 01:47 AM
Hi rosenzweig@acin.tuwien.ac.at
"80% Nyquist passband is 0.4*Fs"
This means that the -3dB is at 0.4Fs.
Please read for pg269-rf-data-converter more details. (Page46: Decimation Filter Operating Modes; Page 48: Decimation Filter Details)
Benedek
11-08-2019 01:47 AM
Hi rosenzweig@acin.tuwien.ac.at
"80% Nyquist passband is 0.4*Fs"
This means that the -3dB is at 0.4Fs.
Please read for pg269-rf-data-converter more details. (Page46: Decimation Filter Operating Modes; Page 48: Decimation Filter Details)
Benedek
11-08-2019 04:03 AM
Thanks a lot. That is excatly what i was looking for.
Philipp
11-08-2019 01:32 PM
Hi,
The passband edge is defined as the point at which the low pass response deviates from the pass band ripple spec of 0.001dB - this means the -3dB point is at a higher frequency. As these are decimation filters, 80% passband is relative to the decimated Nyquist rate, or between 0 to 0.4 of the input Nyquist rate. Hope this helps.