A noise-shaping coder topology for 15+ bit converters

A topology for high-precision noise-shaping converters that can be integrated on a standard digital IC process is presented. This topology uses a multibit noise-shaping coder and a novel form of dynamic element matching to achieve high accuracy and long-term stability without requiring precision matching of components. A fourth-order noise-shaping D/A (digital-to-analog) conversion system using a 3-b quantizer and a dynamic element-matching internal D/A converter, fabricated in a standard double-metal 3- mu m CMOS process, achieved 16-bit dynamic range and a harmonic distortion below -90 dB. This multibit noise-shaping D/A conversion system achieved performance comparable to that of a 1-bit noise-shaping D/A conversion system that operated at nearly four times its clock rate.>