Abstract
This paper describes the design and testing of a hybrid buffer amplifier (HBA) with a theoretical gain error of less than $1 \mu\mathrm{V}/\mathrm{V}$ gain error and $60 \mu\text{deg}$ phase error up to 20 kHz. The application of this amplifier is for use in ac-dc difference measurements such as unloading low amperage ac-dc current shunts and Josephson Arbitrary Waveform Synthesizers. Preliminary experimental results show the ac-dc difference errors less than $(3\pm 2) \mu \mathrm{V}/\mathrm{V} (k=2)$ for $200 \Omega$ and $400 \Omega$ impedances at a rms amplitude of 1 V, and less than $(4\pm 2) \mu \mathrm{V}/\mathrm{V} (k=2)$ for $50 \Omega$ impedance at a rms amplitude of 2 V.
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