A Closest-Value-Substitution Digital Pre-Distortion Method for Current- Steering Digital-to-Analog Converters

Abstract

This paper presents a Closest-Value-Substitution Digital Pre-Distortion(CVSDPD) Method for Current-Steering digital-to-analog converters(DACs). The proposed approach relies solely on offline sampling to select input code whose output values are closest to the ideal, without requiring complex digital calibration circuitry, elaborate error modeling, or prior knowledge of the DAC architecture. This makes the method both versatile and low-cost. MATLAB simulations demonstrate that the proposed method can reduce the static mismatch-induced INL to 1.5 LSB. Furthermore, silicon measurements on a 16-bit DAC fabricated in a 28nm-CMOS process show that the CVSDPD technique improves the SFDR by more than 12 dBc, achieving up to 82 dBc at low frequencies.