Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1991-11-29
1993-06-22
Mottola, Steven
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330277, 330307, H03F 126, H03F 316
Patent
active
052219089
ABSTRACT:
For use in a spacecraft for correcting amplifier distortion, a wideband distortion corrector avoids the need for directional couplers. The corrector includes a FET mounted in a miniature microwave-type housing. Signal flows through the source-to-drain channel. A gate impedance selected to be inductive at the operating frequency is coupled from the FET gate to the platform of the package, and may be simply a loop of bond wire. The channel connects by a strip transmission line to an amplifier, the distortion of which is to be corrected. For enhanced bandwidth, an inductor is coupled between the FET source and drain electrodes within the miniature housing. The platform of the package is coupled to the reference conductor of the transmission line. In one embodiment, direct bias voltage is applied by way of a bias tee across a strip transmission line and ground, and galvanic connections cause the bias to appear between the FET gate electrode and the channel.
REFERENCES:
patent: 4525678 (1985-06-01), Lehmann et al.
patent: 4658220 (1987-04-01), Heston et al.
patent: 5038113 (1991-08-01), Katz et al.
Katz Allen
Pallas George P.
Berard Clement A.
General Electric Co.
Meise William H.
Mottola Steven
Young Stephen A.
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