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Springer proceedings in physics

DC-SQUID Electronics Based on Adaptive Noise Cancellation and a High Open-Loop Gain Controller

Heikki Seppä

Published Jan 1, 1992• 14 citations
Publisher
DOI
10.1007/978-3-642-77457-7_62

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The power gain and the noise temperature of a DC SQUID RF amplifier at a signal frequency 400 MHz were measured in the presence of external microwave radiation at 2 cm, 8 mm and 4 mm wavelengths. The authors used a four-loop planar DC SQUID with an integrated input coil and very low values of inductances and stray capacitances. In the noise measurements they used an SIS junction as a precise source of input noise at high DC bias voltage V b >V 2 Delta . In such a configuration the studied system is the same as an SIS mm-wave mixer with a SQUID IF amplifier.