Cryogenic GaAs-FET amplifiers for SQUIDS
| Autor: | H. Ahola, P. Ostman, G.J. Ehnholm, B. Rantala |
|---|---|
| Rok vydání: | 1979 |
| Předmět: |
Squid
Materials science biology business.industry Amplifier Transistor General Engineering Impedance matching Semiconductor device Condensed Matter Physics Signal Noise (electronics) Atomic and Molecular Physics and Optics law.invention Gallium arsenide chemistry.chemical_compound chemistry law biology.animal Equivalent circuit Optoelectronics General Materials Science Field-effect transistor business |
| Zdroj: | Journal of Low Temperature Physics. 35:313-328 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/bf00115582 |
| Popis: | Gallium arsenide field effect transistor amplifiers for use with SQUIDs and operating at 4.2 K in the frequency range 50–500 MHz have been developed. The system sensitivity is limited by intrinsic SQUID noise and is 5 × 10−30 J/Hz at 500 MHz. Further improvement can be obtained by cooling the SQUID. The methods of obtaining proper impedance matching to the transistor are discussed both theoretically and in connection with practical measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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