One-bit noise-shpaing converters with high-order loop filters have long been considered difficult or impossibleto stabilize. A new approach is discussed which simplifies the analysis of high-order loops, and several topologies that can be used for the implementation of such loops are presented. An 18-bit analog-to-digital converter integrated circuit has been designed using this approach, which uses a fifth-order loop filter with an unusual loop topology. Implementation of the loop using differential switched-capacitor techniques is described. A one-step decimation filter with 115-dB stopband attenuation is used to remove out-of-band quantization noise. Preliminary measurements indicate a dynamic range of 105 dB, a number that is compatible with the requirements of professional digital audio.

Authors: Adams, Robert W.; Ferguson, Jr., Paul F.; Ganesan, Apparajan; Vincelette, Scott; Volpe, Anthony; Libert, Robert
Affiliation: Analog Devices Semiconductor, Wilmington, MA
JAES Volume 39 Issue 7/8 pp. 515-528; July 1991
Publication Date: July 1, 1991

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