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1987•Journal of Physics E Scientific InstrumentsOpen access

A cryogenic Si-JFET preamplifier for SQUIDS

Waldemar Nawrocki, Z. Litwicki

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Abstract

A silicon JFET preamplifier for use with SQUIDS and operating at 4.2 K and at 30 MHz has been developed. The silicon junction field effect transistors are Polish BF 245s. These worked satisfactory at 4.2 K. The noise of the cooling preamplifier is about 0.2 nV Hz -1 2/. A schematic and a description of the preamplifier are given.

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A silicon JFET preamplifier for use with SQUIDS and operating at 4.2 K and at 30 MHz has been developed. The silicon junction field effect transistors are Polish BF 245s. These worked satisfactory at 4.2 K. The noise of the cooling preamplifier is about 0.2 nV Hz -1 2/. A schematic and a description of the preamplifier are given.

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Available abstract

A silicon JFET preamplifier for use with SQUIDS and operating at 4.2 K and at 30 MHz has been developed. The silicon junction field effect transistors are Polish BF 245s. These worked satisfactory at 4.2 K. The noise of the cooling preamplifier is about 0.2 nV Hz -1 2/. A schematic and a description of the preamplifier are given.

Key concepts: Preamplifier, JFET, Schematic, Electrical engineering, Optoelectronics, Noise (video), Transistor, Silicon

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