A 13-bit, 80 kHz Sigma-Delta A/D converter for ISDN.

A Sigma-Delta A/D converter which achieves 81 dB of resolution, 86 DB of linearity and produces output samples at 80 kHz is described. This level of performance is about 10dB higher than previously reported results for oversampled A/D converters in this frequency range. This device is for the ISDN U-Interface. The analog part of the circuit implemented in a 1.75micron 5-volt CMOS process occupies 2 mm sup 2 of silicon area and consume 75 mW of power.