1
Ronald Duane McCallister: Transmitter and method for RF power amplifier having a bandwidth controlled, detroughed envelope tracking signal. CrestCom, Schmeiser Olsen & Watts, Lowell W Gresham, December 9, 2014: US08909175 (59 worldwide citation)

A transmitter (70) generates a time-varying, detroughed, biasing signal (154) for an RF power amplifier (10) so that the RF power amplifier (10) is biased in accordance with an envelope tracking scheme. A trough-filling section (94) is responsive to an envelope tracking signal (86), which in turn is ...


2
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 (58 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 ...


3
Ronald Duane McCallister: Distortion-managed digital RF communications transmitter and method therefor. Crestcom, Meschkow & Gresham, August 29, 2006: US07099399 (26 worldwide citation)

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


4
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 (22 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 ...


5
Ronald Duane McCallister: Transmitter linearized using look-up table with unadaptable data and method therefor. CrestCom, Schmeiser Olsen & Watts, Lowell W Gresham, December 17, 2013: US08611459 (22 worldwide citation)

A transmitter (50) includes a low power nonlinear predistorter (58) that inserts predistortion configured to compensate for a memoryless nonlinearity (146) corresponding to gain droop and another memoryless nonlinearity (148) corresponding to a video signal. When efforts are taken to reduce memory e ...


6
Ronald Duane McCallister: Predistortion circuit and method for compensating A/D and other distortion in a digital RF communications transmitter. CrestCom, Lowell W Gresham, Jordan M Meschkow, Charlene R Jacobsen, March 11, 2008: US07342976 (16 worldwide citation)

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


7
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 (12 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 ...


8
Ronald D McCallister: Methods and apparatus for controlling signals. Crestcom, Morgan & Finnegan L, November 13, 2007: US07295816 (12 worldwide citation)

A communication and/or amplifier system according to various aspects of the present invention includes an excursion signal generator and a filter system. The excursion signal generator identifies a peak portion of a signal that exceeds a threshold, such as a magnitude threshold. The filter system fi ...


9
Ronald Duane McCallister: Radio frequency transmitter and method therefor. Crestcom, Lowell W Gresham, Jordan M Meschkow, Gouri G Nair, June 2, 2009: US07542519 (11 worldwide citation)

An RF transmitter (10) is configured to transmit either wideband multichannel modulations or narrowband multichannel modulations in a variety of licensed frequency bands (70) using a single set of hardware. For narrowband modulations, a digital IF upconversion stage is performed so that, after upcon ...


10
Ronald D McCallister, Eric M Brombaugh: Method and apparatus for adaptively controlling signals. CrestCom, Locke Lord Bissell & Liddell, August 24, 2010: US07783260 (10 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. ...