Ra. Belcher et F. Deravi, DIRECT INTERPOLATION METHOD FOR REDUCING THE NONLINEARITY AND QUANTIZATION DISTORTION OF ANALOG-TO-DIGITAL CONVERTERS, IEE proceedings. Circuits, devices and systems, 142(1), 1995, pp. 61-68
A direct interpolation method is described that reduces the distortion
due to quantisation and linearity errors of practical analogue-to-dig
ital convertors. In contrast with other interpolation systems, the ana
logue signal is not oversampled, and no feedback loops are required. C
ompared with the conventional use of 'dither', direct interpolation pr
ovides an increase in signal-to-noise ratio as well as a reduction in
harmonic distortion. Computer simulations and experimental measurement
s are presented. The method is particularly suited,to reducing high-or
der harmonics and increasing the effective resolution of an ADC.