A 16-bit 60/spl mu/W multi-bit /spl Sigma//spl Delta/ modulator for portable ECG applications

To address the growing field of on-line, out-of-hospital health care a front-end ADC for portable electrocardiographic systems has been designed. The converter is realized as a first-order, 3-bit /spl Sigma//spl Delta/ with an oversampling ratio of 512. Performance is optimized to adhere to the standard IEC60601-2-47, which governs ambulatory ECG equipment. The single ended design achieves a dynamic range of 16 bits for signal offsets up to /spl plusmn/1.25V. Measured power consumption is 60 /spl mu/W with supplies of 2.6V analog and 2.2V digital.