Title :
Properties of autonomous and injection locked flux flow oscillators
Author :
Mygind, J. ; Koshelets, V.P. ; Shchukin, A.V. ; Shitov, S.V. ; Lapytskaya, I.L.
Author_Institution :
Dept. of Phys., Tech. Univ. Denmark, Lyngby, Denmark
fDate :
6/1/1995 12:00:00 AM
Abstract :
Flux flow oscillators (FFO) have been experimentally investigated at frequencies up to 850 GHz. At 440 GHz the received power in an on-chip integrated SIS mixer is 5 /spl mu/W. The first experimental measurements of the FFO linewidth as a function of applied dc bias current and magnetic field have been performed both for two autonomous FFOs and with one of the FFOs injection-locked to a narrow-band external microwave source. By beating the two autonomous FFOs an integral spectral linewidth as low as 750 kHz is measured at 280 GHz. Mechanisms leading to a broadening of the FFO linewidth are discussed. Experimentally it is shown that the FFO can be used as harmonic generator.<>
Keywords :
flux flow; injection locked oscillators; submillimetre wave mixers; submillimetre wave oscillators; superconductor-insulator-superconductor mixers; 280 to 850 GHz; 5 muW; DC bias current; autonomous FFOs; beating; flux flow oscillators; harmonic generator; injection locking; magnetic field; microwave source; on-chip integrated SIS mixer; spectral linewidth; Circuit testing; Detectors; Frequency; Injection-locked oscillators; Josephson junctions; Magnetic flux; Sensor arrays; Superconducting devices; Superconducting microwave devices; Tuned circuits;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
