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A cryogenic amplifier for direct measurement of high-frequency signals from a single-electron transistor

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4 Author(s)
Pohlen, S.L. ; Department of Physics and Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 ; Fitzgerald, R.J. ; Hergenrother, J.M. ; Tinkham, M.

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We have developed a cryogenic voltage amplifier using GaAs metal semiconductor field effect transistors and coupled it to a superconducting single-electron transistor (SET) inside a dilution refrigerator. With this amplifier, we could extend the maximum output frequency of the SET, normally less than a kilohertz, up to 1 MHz. By placing this amplifier off-chip, we could maintain the low SET temperature required for proper SET operation. © 1999 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:74 ,  Issue: 19 )