Published: February 11, 2019
Peter F. Hopkins, Justus A. Brevik, Manuel C. Castellanos Beltran, Nathan E. Flowers-Jacobs, Anna E. Fox, David I. Olaya, Christine A. Donnelly, Paul D. Dresselhaus, Samuel P. Benz
We report on NISTs development of Josephson junction-based programmable reference sources to synthesize quantum-accurate, spectrally-pure waveforms for characterizing and improving next generation communication devices and systems. The goal is to provide reference sources that together span the entire radio frequency (RF) band, equivalent to 7 orders of magnitude in frequency (20 kHz - 300 GHz). To synthesize waveforms in the microwave frequency band, we are extending the existing Josephson arbitrary waveform synthesizer (JAWS) technology that is used for ac voltage metrology at audio frequencies (<20 kHz). Using new microwave circuits and experimental techniques developed at NIST, we demonstrate JAWSbased synthesis of single and multi-tone waveforms at 1 GHz, with output power of -49dBm and spur-free dynamic range (SFDR) of 79 dBc. To synthesize waveforms in the millimeterwave frequency band, we are exploiting single-flux-quantum (SFQ) superconducting digital technology to design circuits that amplify SFQ pulses using a network of pulse splitters. Our initial SFQ-based circuit is used to synthesize a 4 GHz sine wave with output power of -74dBm and an SFDR of 70 dBc.
Citation: IEEE Transactions on Applied Superconductivity
Pub Type: Journals
millimeter-wave, RF, waveform synthesis, superconducting electronics, Josephson junction, single flux quantum, reference source
Created February 11, 2019, Updated April 26, 2019