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AD6655, Spectral reversal

Question asked by Shyam61 on Jun 20, 2016
Latest reply on Jul 31, 2016 by Shyam61


Hi Jonathan,

One more question about AD6655.

"In the event of even Nyquist zone sampling, the half-band filter can be configured to provide a spectral reversal. Setting Bit 2 high in Address 0x103 enables the spectral reversal feature." this is from data sheet , page 39, below figure 73.

Now imagine a condition where Ch-A has +5 to +25 MHz IF , while Ch-B has -5 to -25 MHz IF, in a 100 MHz Sampling clock. Can I use the spectral reversal feature to invert the -5 MHz to -25 MHz spectrum? Here the assumption is that a 15 MHz NCO is used for I & Q generation. Is it same as multiplication by -1 on the Q component?

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