"A Higher Order Topology for Interpolative Modulators for Oversampling A/D Converters", by Chao et al., published at pp. 309-318 of IEEE Transactions on Circuits and Systems, vol. 37, No. 3, Mar. 1990. |
"A Comparison of Modulator Networks for High-Order Oversampled Sigma-Delta Analog-to-Digital Converters", published at pp. 145-159 of IEEE Transactions on Circuits and Systems, vol. 38, No. 2, Feb. 1991. |
"A Third-Order Multistage Sigma-Delta Modulator and Reduced Sensitivity to Nonidealities", published at pp. 1764-1774 of the IEEE Journal of Solid-State Circuits, vol. 26, No. 12, Dec. 1991. |