10 V transconductance amplifier for the comparison of Josephson standards and thermal converters

Abstract

This paper presents a further development of a transconductance amplifier for unloading a Josephson waveform synthesizer in quantum-based ac-dc difference measurements on thermal converters. The new amplifier has ultimate dc and low-frequency precision and works at voltages up to 10 V peak. It enables sub-μν/ν ac-dc transfer measurements at frequencies up to 10 kHz.