This patent refers to an A/D converter, which utilizes digitally pulse-width modulated reference currents for compensating the unknown input current.
The mixed analog-digital frontend operates with noise-shaping of 2nd order, resulting in a resolution gain of 2.5 db with every doubling of the oversampling rate.
This ADC is well suited for extremely high resolution in excess of 24 bit, while allowing sampling rates of 100 Hz. Typical applications of such an ADC are:
Such an ADC is very well suited for space-use, since it can be built as a hybrid module, made from rad-hard parts.
The german patent text may be requested from the Deutsches Patent- und Markenamt.
The author is happy to provide more details on request.