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We present a 90-dB spurious-free dynamic range sigma-delta modulator (61M) for asymmetric digital subscriber line applications (both ADSL and ADSL+), with up to a 4.4-MS/s digital output rate. It uses a cascade (MASH) multibit architecture and has been implemented in a 2.5-V supply, 0.25-m CMOS process with metal-insulator-metal capacitors. The prototypes feature 78-dB dynamic range (DR) in the 30-kHz to 2.2-MHz band (ADSL+) and 85-dB DR in the 30-kHz to 1.1-MHz band (ADSL). Integral anddoi:10.1109/tcsi.2003.821308 fatcat:e3z4pgfgsjbkdko6l5wnjhkvaq