A Temperature Compensation Technique for a Dynamic Amplifier in Pipelined-SAR ADCs

Abstract

This letter presents a temperature compensation technique for the gain of a dynamic amplifier in a pipelined-successive approximation register analog-to-digital converter. A fully dynamic temperature-dependent common-mode detector is proposed to assist in the compensation process of the dynamic amplifier. A single-stage dynamic amplifier with the proposed temperature compensation technique was designed and fabricated in a 130-nm CMOS process with an active area of 0.0135 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . With a 1.2-V power supply, the dynamic amplifier consumes 0.11 mW at 50 MS/s, and the proposed technique reduces the gain variation of the dynamic amplifier from 12.5% to 2.1% across the temperature range of -20 °C to 85 °C.