Digital-to-analog (D/A) converters based on the Josephson effect are promis
ing for ac voltage standards because they produce voltage, steps with ultim
ate precision and stability. We are currently developing a single-flux-quan
tum (SFQ)-based D/A converter, designed for synthesizing sinusoidal wavefor
ms for metrological applications, In this paper, me examine feasibility of
an ac-de transfer difference measurement for a thermal converter using the
SFQ-based D/A converter.