Signal bandwidth versus integration period

Hi gavint ,

Thank you for your interest in AD9162. Each HB filter reduces the bandwidth by 1/2 plus an additional 10%. Consecutive filters reduce bandwidth by another 1/2. 

Given you have an fDATA of 614.4 MSPS, the maximum bandwidth with the first HB filter is 0.9*(fDATA/2) or 276.48 MHz. After the first interpolation stage, the sample rate doubles, but the signal bandwidth does not increase. The second 2× HB filter has a larger absolute passband and therefore is not the limiting filter. Thus, your maximum complex signal BW is ~276.48 MHz or equivalently, ±138.24 MHz around DC for a complex baseband signal (assuming the first half-band filter is operating in the 90% mode and no other digital filter such as FIR85 is enabled).

Best regards,
Marco

Hello Marco

Something else I spotted. My question relates to the AD9162, whereas your response mentions the AD9164. Do the same bandwidth rules apply to both?

Thanks

Gavin

Hello Marco

Something else I spotted. My question relates to the AD9162, whereas your response mentions the AD9164. Do the same bandwidth rules apply to both?

Thanks

Gavin

Hi gavint , 

Apologies for the delayed response. Your understanding is correct: for a complex data rate of fDATA = 614.4MSPS at 4x interpolation (HB2 in 90% BW mode), the max supported complex baseband signal BW is 276.48 MHz which corresponds to ±138.24 MHz around DC. This applies to both the AD9162 or AD9164 (they are from the same DAC family).

Best regards,
Marco