Superconducting Quantum Interference Device Amplifiers with over 27 GHz of Gain-Bandwidth Product Operated in the 4 GHz--8 GHz Frequency Range

摘要

We describe the performance of amplifiers in the 4 GHz--8 GHz range usingDirect Current Superconducting Quantum Interference Devices(DC SQUIDs) in alumped element configuration. We have used external impedance transformers tocouple power into and out of the DC SQUIDs. By choosing appropriate values forcoupling capacitors, resonator lengths and output component values, we havedemonstrated useful gains in several frequency ranges with differentbandwidths, showing over 27 GHz of power gain-bandwidth product. In this work,we describe our design for the 4 GHz--8 GHz range and present datademonstrating gain, bandwidth, dynamic range, and drift characteristics.