1
Ronald Duane McCallister, Eric M Brombaugh: Transmitter predistortion circuit and method therefor. Crestcom, Jordan M Meschkow, Lowell W Gresham, Charlene R Jacobsen, December 30, 2008: US07469491 (57 worldwide citation)

A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200, 1800, 2800) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital re ...


2
Ronald Duane McCallister, Eric M Brombaugh: RF transmitter with variably biased RF power amplifier and method therefor. Crestcom, Lowell W Gresham, Jordan M Meschkow, Charlene R Jacobsen, August 4, 2009: US07570931 (20 worldwide citation)

An RF transmitter (30) includes an RF power amplifier (32) for which the power input bias voltage (40) and signal input bias voltage (80) are controlled within feedback loops. A peak detector (44) generates a lowered-spectrum, peak-tracking signal (34) that follows the largest amplitude peaks of a w ...


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Ronald Duane McCallister, Eric M Brombaugh: RF transmitter with heat compensation and method therefor. Crestcom, Meschkow & Gresham, March 1, 2011: US07899416 (9 worldwide citation)

An RF transmitter (10) includes an RF amplifier (22) that experiences gain-droop distortion as a result of self-heating. A heat compensator (20) is included to insert a gain boost of an amount which is the inverse of the gain droop experienced by the RF amplifier (22). The amount of gain boost is de ...


5
Ronald Duane McCallister, Eric M Brombaugh: RF transmitter with predistortion and method therefor. Crestcom, Meschkow & Gresham, May 25, 2010: US07724840 (8 worldwide citation)

An RF transmitter (10) includes a linear predistorter (22) and a nonlinear predistorter (24) which together drive analog transmitter components (14). The linear and nonlinear predistorters (22, 24) are implemented using a collection of adaptive equalizers (30). A feedback signal (20) is developed by ...


6
Ronald Duane McCallister, Eric M Brombaugh: Transmitting unit that reduces PAPR using out-of-band distortion and method therefor. CrestCom, Meschkow & Gresham, May 22, 2012: US08185065 (8 worldwide citation)

A transmitting unit (12) clips a communication signal (14) to form a threshold-responsive signal (36, 36′) which includes in-band distortion (40) and out-of-band distortion (38). A portion of the out-of-band distortion (38) is notched within rejection bands (48, 50) adjacent to the communication sig ...


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Ronald D McCallister, Eric M Brombaugh: Method and apparatus for adaptively controlling signals. CrestCom, Locke Lord Bissell & Liddell, July 6, 2010: US07751786 (5 worldwide citation)

A signal processing system according to various aspects of the present invention includes an excursion signal generator, a scaling system and a filter system. The excursion signal generator identifies a peak portion of a signal that exceeds a threshold and generates a corresponding excursion signal. ...


9
Ronald D McCallister, Eric M Brombaugh: Method and apparatus for adaptively controlling signals. CrestCom, Locke Lord Bissell & Liddell, August 24, 2010: US07783260 (5 worldwide citation)

A signal processing system according to various aspects of the present invention includes an excursion signal generator, a scaling system and a filter system. The excursion signal generator identifies a peak portion of a signal that exceeds a threshold and generates a corresponding excursion signal. ...


10
Ronald D McCallister, Eric M Brombaugh: Method and apparatus for adaptively controlling signals. CrestCom, Locke Lord Bissell & Liddell, June 29, 2010: US07747224 (4 worldwide citation)

A signal processing system according to various aspects of the present invention includes an excursion signal generator, a scaling system and a filter system. The excursion signal generator identifies a peak portion of a signal that exceeds a threshold and generates a corresponding excursion signal. ...



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