When I designed fir filter for ad9361, I noticed that the number of taps of FIR is automatically changed by Fstop and Fpass setting.
For example, when FIR configuration is set as attached screenshot, the valued of TxFIR taps is 128.
However, when Fpass is changed to 3MHz, the value of TxFIR taps is automatically decreased to 64.
I'd like to know that how the wizard calculates the value of FIR taps internally.
Could you tell me about it?