[hpsdr] ADC Question

[Helmut, DC6NY]

Hi, 

it's not very helpful to evaluate ADCs by comparing SNR, SFDR or ENOB
exhibited in the data sheets.   These data refer to the full Nquist zone and
to one-tone testing. Our SDR is usually a 'small band' application.

Check up noisefloor , IMDR or NPR criteria also in the data sheets. Some
supplier like TI and NS publish these infos meanwhile. Note the measurements
of Adam VA7OJ/AB4OJ, HB9AJG, I2VGO etc. You will recognize that IMD is the
most ticklish issue  in a SDR too and distance to perfect analog designs is
not so far.

 

73 Helmut, DC6NY

 

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