Nonlinear response of a superconducting filter: To compress or not to compress

Salkola, M. I.
May 2005
Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p202506
Academic Journal
Nonlinearities in passive superconducting filters give rise to gain and intermodulation distortions that can diminish their ability to attenuate large interfering signals. It is shown that the departure from gain linearity depends on the phase of a nonlinear interaction. If the nonlinear interaction arises from the kinetic inductance of a superconducting state, the signal frequency determines whether the superconducting filter exhibits gain expansion or compression. The absence of gain expansion is a signature of the nonlinear interaction that is mainly resistive.


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