R. Harjani et Ta. Lee, FRC - A METHOD FOR EXTENDING THE RESOLUTION OF NYQUIST RATE CONVERTERS USING OVERSAMPLING, IEEE transactions on circuits and systems. 2, Analog and digital signal processing, 45(4), 1998, pp. 482-494
Nyquist rate converters have traditionally been used for low to modera
te resolution data acquisition applications. In this paper, we describ
e a feedforward residue compensation (FRC) technique to extend the res
olution of such converters using an oversampling modulator loop. Close
d-form analytical expressions are developed to provide insight into th
e operation and limits on the resolution of such converters. Simulatio
n results are used to verify the operation and confirm the limitations
of this technique.