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What is the operation principle of AD9122 Half-band filter ?

Question asked by ADI_Wei on Feb 21, 2012
Latest reply on Mar 2, 2012 by YiZ

As shown in page 36 of the datasheet, when HB1 operating in mode 0 and mode 1, the input signal is not modulated by the filter , and mode 2 and mode 3 modulate the input signal, what is the modulation principle? Is it similar to the digital quadrature modulator block diagram shown in page 39?

 

When operating in mode 1 and mode 3, mixing of the data between the I and Q paths occurs. How does this occurs? Could you please help to explain it by some equations? And what is the data format to input to the AD9122?

Thank you very much.

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