166 Keysight M8194A 120 GSa/s Arbitrary Waveform Generator User Guide
7 Appendix
Figure 22 Interpolation/Antialiasing filter
The filter shape remains the same no matter the resampling
characteristics. For resampling ratios greater than 1.0, filter will implement
an interpolator so nulls in the impulse response must be located at
multiples of the sampling period of the input signal. For ratios lower than
1.0 the filter will implement an antialiasing filter. In this case, distance
between nulls will have to be longer than the output waveform sampling
period so the filter reach the required attenuation (>80 dB) at the output
signal Nyquist frequency. For the implemented filter this is accomplished
by choosing 0.89 ratio between the output sampling period and the
distance between consecutive nulls in the filter’s impulse response.
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