A 3 V 10 b 100 MS/s digital-to-analog converter for cable modem applications

Abstract

This paper describes a 10 b 100 MS/s CMOS digital-to-analog converter (DAC) for cable modem applications. Differential switches with the proposed deglitching circuit and the cascode current sources, separated from the unit decoded current cell matrix improve the dynamic performance. The proposed and conventional prototype DAC's are fabricated in a 0.35 /spl mu/m CMOS process. The measured differential and integral nonlinearities of the proposed DAC shows /spl plusmn/0.17 LSB and /spl plusmn/0.43 LSB at a 10b level, respectively. At 100 MS/s, the spurious-free dynamic range is 66 dB for a 100 kHz input signal and 52 dB for a 10 MHz input signal.