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The typicalsampling rate on the RF5609A is 50 timeslhe corner frequency. (Note: Sampling rate = 1/2 input clock trigger rate.) Because the sample rate will be far from the frequencies of interest in most cases, antialiasing filtering will usually not be required. However, as with all sampling systems, frequencies or noise above half the sample rate wiIJ be aliased and may appear in the band of interest. If this is the case, an external antialiasing filter will be required on the input. A one- or two-pole Butterworth low-pass filter will usually suffice. An unstable clock frequency can also produce the effect of an aliased signal. In applications where sampling residue may affect system perfor- mance, a single-pole RC filter may be added to the output.