Two-Dimensional Structure Compatible with DEM Methods Utilizing in DACs

Abstract

A two-dimensional digital-to-analog converter (DAC) structure compatible with dynamic element matching (DEM) methods is presented. Unlike the DACs using segmented structure for employing DEM, the new structure randomizes inter-segment error. This advantage is achieved because of the characteristics of the algorithm of two-dimensional decoding. The simulation results in 180[Formula: see text]nm CMOS technology, 319.72[Formula: see text]MHz signal frequency and 800[Formula: see text]MS/s sample rate for an 8-bit two-dimensional DAC utilizing the presented structure, shows 14.94[Formula: see text]dB spurious-free dynamic range (SFDR) improvement compared to the SFDR of the same DAC without employing the presented structure. Also, the IMD3 of the DAC employing the presented structure for [Formula: see text][Formula: see text]MHz and [Formula: see text][Formula: see text]MHz is 50.1[Formula: see text]dB.