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194 Views
Registered: ‎04-08-2019

RF-ADC decimation filter

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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

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Explorer
Explorer
179 Views
Registered: ‎10-12-2018

Re: RF-ADC decimation filter

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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

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Explorer
Explorer
180 Views
Registered: ‎10-12-2018

Re: RF-ADC decimation filter

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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

154 Views
Registered: ‎04-08-2019

Re: RF-ADC decimation filter

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Thanks a lot. That is excatly what i was looking for.

Philipp

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Xilinx Employee
Xilinx Employee
123 Views
Registered: ‎03-21-2008

Re: RF-ADC decimation filter

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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.