NI5922 High Speed Digitizer - Antialiasing digital input filter

[Roberto_N.]

Is it possible to acquire a signal with the NI5922 board, without the antialising digital input filter?

My application doesn't require the antialias protection, and It would be useful the avilability of the full Nyquist band.

Thanks for your answers.

Natalino Roberto

[psisterhen]

There is no way to disable the alias-protection in the 5922.  The cutoff frequency of the digital input filter varies by sample rate, but the ratio is constant (cutoff freq = .43 * sample rate).  If you need a wider bandwidth, you will need to increase the sample rate- but, keep in mind that this may decrease your resolution, since the 5922 is a flexible-resolution digitizer.

You can configure the type of the digital filter.  Refer to the documentation for the NISCOPE_ATTR_FLEX_FIR_ANTIALIAS_FILTER_TYPE attribute (Vertical:Advanced:Flex FIR Antialias Filter Type in LabVIEW).  You can configure a number of different options for the 5922.  However, the option with the highest bandwidth is the default setting that I discussed above.