Microstrip superconducting quantum interference device radio-frequency amplifier: Effects of negative feedback on input impedance
نویسندگان
چکیده
We present the results of measurements of the scattering parameters of microstrip amplifiers MSAs based on the dc superconducting quantum interference device. The amplifier input impedance is poorly matched to typical transmission line impedances, resulting in high input return loss around 2 dB. We show that negative feedback can lower the MSA input impedance to achieve a robust match to 50 . In the presence of capacitive and inductive feedback, the input return loss of the MSA can be reduced below 10 dB, opening the door to the practical use of the MSA for a variety of demanding applications. © 2009 American Institute of Physics. DOI: 10.1063/1.3114419
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