Abstract
We report a design procedure and performance of a voltage amplifier using commercially available GaAs metal-semiconductor field-effect transistors. There are two stages: a common-source amplifier that provides a moderate gain, followed by a common-drain stage for driving the 50Ω coaxial cable. The overall voltage gain measured at 4.2K with a 50Ω load is 3.3, with a bandwidth of 36MHz. The input-referred voltage noise is measured to be approximately 3.2nV∕√Hz in a wide frequency range.
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