Power-up calibration techniques for double-sampling ΔΣ modulators
Two new start-up DAC calibration techniques are proposed for double-sampling ΔΣ modulators. The first one is a modification of the existing calibration technique, while the second technique is proposed specifically for double-sampling ΔΣ modulators. Dynamic element matching is used to eliminate ‘intra-DAC’ mismatches, and digital correction for the remaining ‘inter-DAC’ mismatches.