Noise characteristics of a dc SQUID with a resistively shunted inductance
Noise characteristics of a dc SQUID with an inductance shunted by a damping resistance are studied numerically. It is shown that the damping resistance improves considerably the resolution of the SQUID in the case of large ..beta.., where ..beta.. = 2LI/sub 0//Phi/sub 0/, I/sub 0/ is a critical current, L is a loop inductance and Phi/sub 0/ is the flux quantum. The energy resolutions for ..beta.. = 4 and ..beta.. = 10 are only about 2 and 4 times larger than that for ..beta.. = 1, respectively. Furthermore, the ranges of both the bias current and the external flux, where good resolution is obtained, become very wide compared with the conventional SQUID. Therefore, the SQUID with the damping resistance can be used for large ..beta.. (or L) without the significant degradation of the resolution, and will much improve the coupling properties between the SQUID and the input circuitry. The numerical simulation results are also compared with analytical ones, and a reasonable agreement is obtained.
- Research Organization:
- Department of Electronics, Kyushu University 36, Fukuoka 812, Japan
- OSTI ID:
- 5650076
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 58:5; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANALYTICAL SOLUTION
CRITICAL CURRENT
CURRENTS
DAMPING
DATA
ELECTRIC CURRENTS
ELECTRONIC EQUIPMENT
ENERGY RESOLUTION
EQUIPMENT
FLUXMETERS
INFORMATION
MAGNETIC FLUX
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NOISE
NUMERICAL DATA
NUMERICAL SOLUTION
ONE-DIMENSIONAL CALCULATIONS
RESOLUTION
SQUID DEVICES
SUPERCONDUCTING DEVICES
THEORETICAL DATA