![]() ![]() In order to determine whether the suppression of the critical current by an applied control current is caused by the magnetic induction or thermal heating due to dissipation in the control line, two different device geometries were developed. Superconducting flux-flow transistors were fabricated from thin (50 nm) high temperature superconducting YBa/sub 2/Cu/sub 3/O/sub 7/ films. The development of the superconducting amplifier applicable to various devices is expected. ![]() From our paper, the characteristics of amplification for superconducting flux flow transistor (SFFT) could be confirmed. The current and the voltage gains, which can be derived from the circuit for small signal analysis, were calculated at each operational point and compared with the results obtained from the numerical analysis for the small signal circuit. The variation of transresistance, which describes the operational characteristics of superconducting amplifier, was estimated with respect to conditions of dc bias. For the analysis of operation as an amplifier, dc bias operational point for the superconducting amplifier is determined and then ac operational characteristics for the designed superconducting amplifier were investigated. The operational characteristics of superconducting amplifier using vortex flux flow were analyzed from an equivalent circuit in which its current-voltage characteristics for the vortex motion in YBCO microbridge were reflected.
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