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DDS output filters (DAC reconstruction filters)

Question asked by fossil on Jun 3, 2013
Latest reply on Jun 5, 2013 by fossil

I'm using an AD9834 to generate 15.2 MHz (using a 52 MHz clock) and then picking off the 1st image at 36.8 MHz. The output is terminated in the recommended 200 ohms and an RF transformer. I'll put the BP filter on the other side of the transformer, but according to AN-837, it looks like the first element of the filter has to be a shunt element because of the current source. That's inconvenient if you want to use a top-C coupled 3rd order filter, where the first element is series. Does the presence of the RF transformer relieve me of having to worry about whether the filter input is series or shunt?

Thanks!

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