A 10-bit binary-weighted DAC with digital background LMS calibration

Abstract

A 10-bit binary-weighted DAC utilizes identical transistors with different overdrive voltages to achieve small area and high speed. Employing LMS calibration, the proposed current-steering DAC can be digitally calibrated in the background. The measured SFDR of the output signal at 61 kHz can be improved by 19 dB at 1 GS/s. The 10-bit DAC occupies 0.2 mm2 in a 0.18-mum CMOS technology and consumes 27 mW from a 1.8-V supply.