ADC TEST USING FILTERING AND DIGITAL CORRECTION

摘要

The combination of two methods enable to decrease an influence of testing signal distortion for testing of the dynamical quality of middle resolution AD modules in frequency range from several tens of kHz to several MHz is described. In the first step, the distortion of a generated testing signal is suppressed by applying a low distortion LC filter special designed for this purpose. It decreases all spurious components and also even harmonic components of the generated signal, but further odd harmonic component arise due to applying a ferromagnetic material in the used coils. However, in combination with the modified FFT method (spectrum correction test) these undesirable harmonic components can be digitally corrected.