Low-noise circuitry for low-temperature NMR and SQUIDs
- 1 September 1977
- journal article
- letter
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 48 (9), 1219-1220
- https://doi.org/10.1063/1.1135228
Abstract
A method of coupling the low‐temperature induction coil of an NMR or SQUID system to a preamplifier is proposed. This method greatly reduces the Johnson noise generated by line losses. A suitable 9‐K noise‐temperature GaAs FET, liquid nitrogen cooled preamplifier is described. The coupling scheme and preamplifier will yield a spectrometer with a noise temperature near 15 K.Keywords
This publication has 4 references indexed in Scilit:
- Tunnel junction dc SQUID: Fabrication, operation, and performanceJournal of Low Temperature Physics, 1976
- V.H.F. f.e.t. preamplifier with 0.3 dB noise figureElectronics Letters, 1975
- Liquid Helium Temperature cw NMR S/N Improvement Using a MOSFET rf AmplifierReview of Scientific Instruments, 1970
- Helium Cooled Radio Frequency Preamplifier for Use in NMRReview of Scientific Instruments, 1968