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Articles you may be interested inThe pumpistor: A linearized model of a flux-pumped superconducting quantum interference device for use as a negative-resistance parametric amplifier A transmission line with distributed positive and negative resistances as well as with distributed noise generators is treated. Gain and noise factor are derived as a function of boundary conditions, matching conditions and distributed noise. It is found that low-noise amplification can be achieved on such a line provided the line is characterized by high gain per unit length, high total gain, good matching, and low distributed noise. A distortionless active line for such low-noise amplifiers appears attractive.

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