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RF Josephson Arbitrary Waveform Synthesizer with Integrated Superconducting Diplexers



Akim Babenko, Nathan Flowers-Jacobs, GREGOR LASSER, Justus Brevik, Anna Fox, Paul Dresselhaus, Zoya Popovic, Samuel P. Benz


We present the design, fabrication and characterization of a broadband RF Josephson Arbitrary Waveform Synthesizer (RF-JAWS) with a series array of 4500 Josephson junctions (JJs) and integrated low-pass/high-pass five-pole superconducting diplexers. The integrated diplexers enable broadband filtering of the drive-current pulses with decade-wide instantaneous bandwidth. The diplexers have at least 30 GHz passband with less than 0.8 dB insertion loss. The JJ array is driven with a delta-sigma pulse sequence that encodes 10 kHz and 1.005 GHz tones, and generates an open-circuit voltage of 22 mV rms (−26.18 dBm) into 50 Ω at 1.005 GHz – a 25% increase compared to the state of the art. The drive current pulses undergo a three-step equalization to compensate for the linear distortion of the room-temperature electronics, the on-chip diplexers and the remaining on- and off-chip components. The measured parasitic feedthrough voltages at 1.005 GHz are around −33 dBc, and their effect on the quantum locking ranges (QLRs) is quantified by measurements. The results demonstrated in this paper show a significant step toward a broadband, integrated, quantum-based microwave voltage source.
IEEE Transactions on Applied Superconductivity


Josephson junctions, pulse measurements, superconducting integrated circuits, superconducting microwave devices, equalizers


Babenko, A. , Flowers-Jacobs, N. , LASSER, G. , Brevik, J. , Fox, A. , Dresselhaus, P. , Popovic, Z. and Benz, S. (2022), RF Josephson Arbitrary Waveform Synthesizer with Integrated Superconducting Diplexers, IEEE Transactions on Applied Superconductivity, [online],, (Accessed March 2, 2024)
Created August 24, 2022, Updated December 22, 2023