Flux-Flow-Type Josephson Linear Amplifier with Large Gain and Wide Linear Range

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Abstract
A linear amplifier using a flux-flow phenomenon in a long Josephson junction has been designed and tested by connecting a load resistance. The present experiment has demonstrated that a current gain of 500/W s (1/µm) is obtained for the load resistance of 9 mΩ when an input signal is applied with a control line of width W s (µm). An equivalent circuit of the amplifier has also been presented, which shows that the device is most suitable for current amplification with large gain in low impedance circuits.