DSO2250-USB ADC reference loading effects (0/1)
It was initially presumed that the DC reference of the individual ADCs
was exhibiting a regulation effect as the input signal was biased positive for position in the GUI. The waveforms 120107a through C show that the loading effect depends on whether or not the biased input varies from half-reference levels. At midpoint position in the GUI, no reference loading occurs, dependant upon the stiffness of reference decoupling. http://www.magma.ca/~legg/TVS/120107a_deviation.jpg http://www.magma.ca/~legg/TVS/120107b_deviation.jpg http://www.magma.ca/~legg/TVS/120107c_deviation.jpg A unipolar loading effect could have been compensated fairly simply by using the ADC outputs themselves to contribute reference bias, as the ADC output is positive logic and the originally noted reference regulation was negative. It's possible that the same compensation is still viable. Will let you know. RL |
DSO2250-USB ADC reference loading effects (0/1) - 120108_graph.jpg (1/1)
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