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19 th International Symposium on Space Terahertz Technology P7-6 High Power Heterostructure Barrier Varactor Quintupler Sources for G-Band Operation Josip Vukusic, Tomas Bryllert and Jan Stake Department of Microtechnology and Nanoscience, Chalmers University of Technology; SE-41296 Göteborg, Sweden (e-mail: vukusic@chalmers.se). Abstract: There is a need for signal power in the G-band (140-220 GHz) for remote sensing of atmospheric gases and imaging applications, both as local oscillator and illumination source. Because of the inherent difficulty to generate power at these frequencies the output power from a lower frequency source can be multiplied to higher frequencies using a nonlinear device such as the heterostructure barrier varactor (HBV) diode. The advantage of the HBV is the symmetric/antisymmetric C-V/I-V that only allows odd multiplication, i.e x3, x5, x7 etc [1], which is beneficial leverage when targeting high frequencies. Also, the HBV operates bias free which simplifies connective circuitry resulting in a more compact and robust solution. Since the voltage handling capability of the HBV can be scaled by cascading the epitaxial growth this device is well suited for high power generation [2]. We aim at presenting design, fabrication and experimental results from state-of-the-art quintuplers (x5) operating at ~170 and ~200 GHz. The graph below shows measurement results from a 202 GHz quintupler with over 20 mW output power (limited by the available input power). Graph (a) Output power and efficiency from a 202 GHz HBV quintupler (b) frequency sweep with a constant input power for the quintupler References: [1] T. Bryllert, A. Olsen, J. Vukusic, T. A. Emadi, M. Ingvarson, J. Stake and D. Lippens, “11% efficiency 100 GHz InP-based heterostructure barrier varactor quintupler” Electron. Lett., vol. 41, no. 3, pp. 131–132, Feb. 3, 2005. [2] J. Vukusic, T. Bryllert, T. A. Emadi, M. Sadeghi, and J. Stake, "A 0.2-W heterostructure barrier varactor frequency tripler at 113 GHz," IEEE Electron Device Letters, vol. 28, pp. 340-342, May 2007. 140
19 th International Symposium on Space Terahertz Technology P7-7 Cryogenic Phase Locking Loop System for Flux-Flow Oscillator A.V. Khudchenko 1,2 , V.P. Koshelets 1,2 , P.N. Dmitriev 1 , A.B. Ermakov 1,2 , O.M. Pylypenko 3 and P.A. Yagoubov 2 , 1 Institute of Radio Engineering and Electronics, Moscow, Russia 2 SRON Netherlands Institute for Space Research, Groningen, the Netherlands 3 State Research Center of Superconducting Electronics "Iceberg", Kyiv, Ukraine ABSTRACT Recently a cryogenic phase detector (CPD) based on a superconductor-insulatorsuperconductor junction has been proposed and preliminary tested. A sinusoidal output signal of the CPD has been measured. Experimental data demonstrate that the CPD intrinsically could operate with an effective bandwidth more than 100 MHz. The CPD is initially intended for phase locking of the Flux-Flow Oscillator (FFO) in the Superconducting Integrated Receiver (SIR). A model describing coupling between a CPD and an FFO has been developed and experimentally verified. This model takes into account dependence of the CPD current on the input power and differential resistance of the CPD. Design of the Cryogenic Phase Locking Loop (CPLL) system for the SIR will be presented along with results of its implementation. An effective bandwidth of the CPLL system exceeds 25 MHz at an operation frequency of 400 MHz. This is considerably better than bandwidth of the room-temperature PLL system which is limited to 12 MHz by unavoidable delays in the long cables and semiconductor PLL system. The novel CPLL system synchronizes more than 50% of the FFO power for free-running FFO linewidth of about 10 MHz, compare to 20% in the case of regular PLL system. It results in improvement of the FFO spectral ratio and would expand the SIR operation range. Details of the phase noise measurements for the FFO phaselocked by the CPLL and results of development of the CPLL with the operation frequency 4 GHz will be discussed. Practical application of the CPLL looks especially promising for development of the arrays of SIRs. The work was supported by the projects: RFBR 06-02-17206, ISTC 3174, NATO SfP 981415, and Grant for Leading Scientific School 5408.2008.2 Presentation: poster The corresponding author: Andrey V. Khudchenko Institute of Radio Engineering and Electronics Mokhovaya street 11, bldg 7; Moscow, 125 009, Russia Phone: +7-495-6293418 Fax +7-495-6293678 E-mail: Khudchenko@hitech.cplire.ru 141
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