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FLUX FLOW OSCILLATORS FOR SUPERCONDUCTING INTEGRATED SUBMM WAVE RECEIVERS

V. P. Koshelets, J. Mygind

Published Jan 1, 2001• 8 citations
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A Josephson flux flow oscillator (FFO) is the most developed superconducting local oscillator for integration with an SIS mixer in a single-chip submm-wave receiver. Recently, using a new FFO design, a free-running linewidth /spl les/10 MHz has been measured in the frequency range up to 712 GHz, limited only by the gap frequency of Nb. This enabled us to phase lock the FFO in the frequency range 500-712 GHz where continuous frequency tuning is possible; resulting in an absolute FFO phase noise as low as -80 dBc at 707 GHz. Comprehensive measurements of the FFO radiation linewidth have been performed using an integrated SIS harmonic mixer. The influence of FFO parameters on radiation linewidth, particularly the effect of the differential resistances associated both with the bias current and the applied magnetic field has been studied in order to further optimize the FFO design. A new approach with a self-shielded FFO has been developed and experimentally tested.

IEEE Transactions on Applied Superconductivity•Jun 1, 2003•11 citations

SUPERCONDUCTING INTEGRATED RECEIVER

V. P. Koshelets

A Superconducting Integrated Receiver (SIR) [1, 2] was proposed more than 10 years ago and finally has been developed for practical applications [3]. A SIR comprises in one chip (size of 4 mm*4 mm*0.5 mm) a low-noise SIS mixer with quasioptical antenna, an flux-flow oscillator (FFO) [4] acting as a Local Oscillator (LO) and a second SIS harmonic mixer (HM) for the FFO phase locking, see Fig. 1. All components of the SIR microcircuits are fabricated in a high quality Nb-AlN/NbN-Nb tri-layer on a Si substrate [5]. The receiver chip is placed on the flat back surface of the silicon lens, forming an integrated lens-antenna. Light weight and low power consumption combined with nearly quantum limited sensitivity and a wide tuning range of the FFO make SIR a perfect candidate for many practical applications. In particular we have developed integrated receiver for novel balloon borne instrument TELIS (Terahertz Limb Sounder) [6]. TELIS is a collaborative European project to build a three-channel heterodyne balloon-based spectrometer for measuring a variety of the stratosphere constituents.

•Jan 1, 2009•0 citations
A Josephson flux flow oscillator (FFO) is the most developed superconducting local oscillator for integration with an SIS mixer in a single-chip submm-wave receiver. Recently, using a new FFO design, a free-running linewidth /spl les/10 MHz has been measured in the frequency range up to 712 GHz, limited only by the gap frequency of Nb. This enabled us to phase lock the FFO in the frequency range 500-712 GHz where continuous frequency tuning is possible; resulting in an absolute FFO phase noise as low as -80 dBc at 707 GHz. Comprehensive measurements of the FFO radiation linewidth have been performed using an integrated SIS harmonic mixer. The influence of FFO parameters on radiation linewidth, particularly the effect of the differential resistances associated both with the bias current and the applied magnetic field has been studied in order to further optimize the FFO design. A new approach with a self-shielded FFO has been developed and experimentally tested.
A Superconducting Integrated Receiver (SIR) [1, 2] was proposed more than 10 years ago and finally has been developed for practical applications [3]. A SIR comprises in one chip (size of 4 mm*4 mm*0.5 mm) a low-noise SIS mixer with quasioptical antenna, an flux-flow oscillator (FFO) [4] acting as a Local Oscillator (LO) and a second SIS harmonic mixer (HM) for the FFO phase locking, see Fig. 1. All components of the SIR microcircuits are fabricated in a high quality Nb-AlN/NbN-Nb tri-layer on a Si substrate [5]. The receiver chip is placed on the flat back surface of the silicon lens, forming an integrated lens-antenna. Light weight and low power consumption combined with nearly quantum limited sensitivity and a wide tuning range of the FFO make SIR a perfect candidate for many practical applications. In particular we have developed integrated receiver for novel balloon borne instrument TELIS (Terahertz Limb Sounder) [6]. TELIS is a collaborative European project to build a three-channel heterodyne balloon-based spectrometer for measuring a variety of the stratosphere constituents.