원문정보
초록
영어
Low-noise amplifiers in the radio-frequency (RF) band based on the direct current (DC) superconducting quantum interference device (SQUID) can be used for quantum-limited measurements in precision physics experiments. For the prediction of peak-gain frequency of these amplifiers, we need a reliable design formula for the resonance frequency of the microstrip circuit. We improved the formula for the resonance frequency, determined by parameters of the DC SQUID and the input coil, and compared the design values with experimental values. The proposed formula showed much accurate results than the conventional formula. Minor deviation of the experimental results from the theory can be corrected by using the measured geometrical parameters of the input coil line.
목차
1. INTRODUCTION
2. RESONANCE FREQUENCY MODEL
2.1. Basic configuration of SQUID RF amplifier
2.2. Resonance frequency of SQUID RF Amplifier
3. FABRICATION OF SQUIDS
3.1. Fabrication process of SQUID amplifiers
4. MEASUREMENT OF AMPLIFIER GAIN CURVE
4.1. Measurement setup
4.2. Measured gain curve
4.3. Dependence of resonance frequencies on the input coil parameters
5. CONCLUSIONS
ACKNOWLEDGMENT
REFERENCES