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AFE7952: FREQ-DDC-FILTER-CALC tool for IL, HD2 image, HD3 image

Gordon Liu
Intellectual 825 points
Part Number: AFE7952

Hi,

I find out a good tool in TI; https://www.ti.com/tool/FREQ-DDC-FILTER-CALC  

I set on sheet-2 ; Fs=2900MHz,  Interleave=2,  Fc=2050MHz, BW=1MHz.

I get: Rx band=850MHz,  HD2 image=250MHz, HD3 image=1100MHz, IL=600MHz

1: Interleace=2;  Fs become 5800MHz or 1450MHz?? 

2: What;s the interleave spur. (IL) and how to calculate it?? 

  • +1
    TI__Guru 66104 points

    Hi Gordon,

    For AFE7952, there is no interleaving ADC. Interleaving ADC means that to achieve 3GSPS of sampling, there are two ADCs operating at 1.5GSPS each at 180 degree out of phase. Interleaving causes Fs/2 +/- FIN spurs, where FS = sampling rate of 3GSPS, and FIN is the input frequency.

    Since AFE7952 has no interleave ADC, the interleave spur does not exist.

    -Kang