1
James A Proctor, Lance Todd Mucenieks: Adaptive digital predistortion linearization and feed-forward correction of RF power amplifier. Spectrian, Charles E Wands, September 7, 1999: US05949283 (112 worldwide citation)

A digitally implemented, look-up table-based, predistortion and feed-forward correction signal processing mechanism compensates for distortion generated in the RF power amplifier. The input signal to the RF amplifier is stored for comparison with the measured the RF output. In each of predistortion ...


2
Donald K Belcher, Michael A Wohl, Kent E Bagwell: Feed-forward correction loop with adaptive predistortion injection for linearization of RF power amplifier. Spectrian, Charles E Wands, June 2, 1998: US05760646 (94 worldwide citation)

A linearization scheme for an RF power amplifier combines an adaptive predistortion modulator with a feedforward error correction loop, which cancels noise imparted by predistortion modulation to the amplified signal, and minimizes distortion in the RF amplifier's output to a level that allows the u ...


3
Lance Todd Mucenieks: Distortion detection apparatus for controlling predistortion, carrier cancellation and feed-forward cancellation in linear RF power amplifiers. Spectrian Corporation, Allen Dyer Doppelt Milbrath & Gilchrist P A, March 19, 2002: US06359508 (86 worldwide citation)

RF power amplifier distortion can be accurately measured in the presence of multi-carrier input signals, by using a common swept local oscillator to tune RF input and output receivers, whose outputs are monitored for distortion correction purposes. In carrier cancellation and feedforward cancellatio ...


4
David Kent Bonds: Swept performance monitor for measuring and correcting RF power amplifier distortion. Spectrian Corporation, Allen Dyer Doppelt Milbrath & Gilchrist P A, May 7, 2002: US06384681 (81 worldwide citation)

RF power amplifier distortion is measured in the presence of multi-frequency input signals, by sweeping a local oscillator to tune RF input and output receivers. When the power detected by the input receiver exceeds a carrier energy threshold, the operation of a predistortion processor is blanked. T ...


5
John Eisenberg, Steve Avis: Closed loop active cancellation technique (ACT)-based RF power amplifier linearization architecture. Spectrian Corporation, Allen Dyer Doppelt Milbrath & Gilchrist P A, September 17, 2002: US06452446 (77 worldwide citation)

A closed loop, active cancellation technique (ACT)-based RF power amplifier linearization architecture injects a pilot tone as a ‘pseudo distortion’ signal into signal paths through first and second matched RF amplifiers, and a set of power minimization loops are closed around the RF amplifier pair. ...


6
Armando C Cova, Emil J Crescenzi Jr, Augustin P Chang, Stephen J Foley: High linearity multicarrier RF amplifier. Spectrian Corporation, Allen Dyer Doppelt Milbrath & Gilchrist P A, January 7, 2003: US06504428 (71 worldwide citation)

A hybrid multicarrier RF power amplifier linearization architecture combines ACT and feed-forward amplifier stages to achieve high output distortion rejection and enhanced amplifier linearity. A carrier cancellation loop is coupled with a main RF power amplifier stage having parallel RF power amplif ...


7
Lance Todd Mucenieks, David Kent Bonds: Carrier-blanking mechanism for sweeping detector used to measure and correct RF power amplifier distortion. Spectrian Corporation, Allen Dyer Doppelt Milbrath & Gilchrist P A, June 18, 2002: US06407635 (69 worldwide citation)

RF power amplifier distortion can be accurately measured in the presence of multi-frequency input signals, by using a swept local oscillator to tune RF input and output receivers. The power detected by the input receiver is compared with a threshold associated with the carrier. Whenever the power de ...


8
Donald K Belcher, Michael A Wohl, Kent E Bagwell: Adaptive compensation of RF amplifier distortion by injecting predistortion signal derived from respectively different functions of input signal amplitude. Spectrian, Charles E Wands, April 6, 1999: US05892397 (68 worldwide citation)

The envelope-dependency of the distortion-introducing behavior of an RF power amplifier is used to derive a predistortion signal, that is derived from a plurality of respectively different work function representative signals. Each work function signal, in turn, is based upon the envelope of the inp ...


9
Francois Hebert, Daniel Ng: MOSFET having buried shield plate for reduced gate/drain capacitance. Spectrian, Henry K Woodward, Townsend and Townsend and Crew, June 15, 1999: US05912490 (65 worldwide citation)

Gate to drain capacitance in a lateral DMOS and vertical DMOS field effect transistor is minimized by providing a conductive shield plate under the gate and between the gate and the drain of the transistor. In operation, the shield plate is preferably connected to a DC voltage potential and coupled ...


10
Francois Hebert: Lateral diffused MOS transistor with trench source contact. Spectrian, Henry K Woodward, Townsend and Townsend and Crew, February 9, 1999: US05869875 (59 worldwide citation)

A lateral diffused MOS transistor formed in a doped epitaxial semiconductor layer on a doped semiconductor substrate includes a source contact to the substrate which comprises a trench in the epitaxial layer filled with conductive material such as doped polysilicon, a refractory metal, or a refracto ...



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