Microwave linear oscillator/amplifier utilizing a multicoupled ferrite resonator
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United States of America Patent
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Sep 1, 1998
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app pub date -
May 13, 1997
filing date -
May 13, 1997
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Abstract
A multi-octave ferrite oscillator topology that utilizes transformer coupling to provide the proper phase shift in the feedback loop. In a specific embodiment, a 10 mil YIG sphere is loosely coupled to 20 mil input and output loops, both of which are connected to a GaAs integrated circuit that includes a Darlington pair of bipolar transistors. The Darlington pair provides high gain, high output power, and low parasitic reactance up to about 10 GHz. A resistor bridge across the base of the input transistor of the Darlington pair insures a substantially real input impedance over a wide bandwidth.
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