Fully-monolithic, 600°C differential amplifiers in 6H-SiC JFET IC technology

Abstract

A family of fully-integrated differential amplifiers was designed and fabricated in 6H-SiC, n-channel JFET integrated-circuit technology. A single-stage amplifier with resistor loads has gain-bandwidth of ~2.8 MHz, and differential-mode gain that varies by less than 1 dB from 25-600degC. A two-stage amplifier with current-source loads and common-mode feedback in 1 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">st</sup> -stage, and resistor loads in 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> -stage has gain-bandwidth of 1.4 MHz, and differential-mode gain of 69 dB at 576degC, with just 3.6 dB gain-variation from 25-576degC.