Optimizing MMIC Reflection-Type Oscillators

F. Lenk, M. Schott, J. Hilsenbeck, and W. Heinrich

Ferdinand-Braun-Institut für Höchstfrequenztechnik, Albert-Einstein-Straße 11, D-12489 Berlin, Germany

Published in:
IEEE MTT-S Int. Microwave Symp. Dig., 2004, pp. 1341-1344.
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Abstract:
In this paper, optimization of the loaded quality factor Q_L for reflection-type HBT oscillators is investigated. Main result is an optimum relation between the S parameter phases at the three transistor ports. To support this finding, a 35.5 GHz MMIC VCO phase-noise better then -85 dBc/Hz at 100 kHz offset frequency is require efforts not only to keep reflections low but demonstrated.

Index Terms:
Q factor, Microwave oscillators, MMIC oscillators, Voltage controlled oscillators, Heterojunction bipolar transistors

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