Michael W Rawlins

US Patent:

6687493, Feb 3, 2004

Filed:

Apr 16, 1999

Appl. No.:

09/293342

Inventors:

David F. Sorrells - Jacksonville FL
Michael J. Bultman - Jacksonville FL
Robert W. Cook - Switzerland FL
Richard C. Looke - Jacksonville FL
Michael W. Rawlins - Lake Mary FL
Gregory S. Rawlins - Lake Mary FL

Assignee:

ParkerVision, Inc. - Jacksonville FL

International Classification:

H04B 126

US Classification:

455323, 455313, 455333

Abstract:

Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.

US Patent:

6694128, Feb 17, 2004

Filed:

May 10, 2000

Appl. No.:

09/567963

Inventors:

David F. Sorrells - Middleburg FL
Michael J. Bultman - Jacksonville FL
Robert W. Cook - Switzerland FL
Richard C. Looke - Jacksonville FL
Gregory S. Rawlins - Lake Mary FL
Michael W. Rawlins - Lake Mary FL
Francis J. Smith - Livermore CA

Assignee:

ParkerVision, Inc. - Jacksonville FL

International Classification:

H04B 140

US Classification:

455 76, 455260, 327105, 331 34, 331143, 376376

Abstract:

Frequency translation and applications of same are described herein, including frequency synthesizers that employ universal frequency translation technology. The universal frequency translation technology includes a device for switching, a device for storing, and an energy transfer signal for controlling the switching device. The energy transfer signal may include pulses having apertures sufficiently wide to effect substantial energy transfer.

US Patent:

6813485, Nov 2, 2004

Filed:

Apr 20, 2001

Appl. No.:

09/838387

Inventors:

David F. Sorrells - Middleburg FL
Michael J. Bultman - Jacksonville FL
Robert W. Cook - Switzerland FL
Richard C. Looke - Jacksonville FL
Gregory S. Rawlins - Heathrow FL
Michael W. Rawlins - Lake Mary FL

Assignee:

ParkerVision, Inc. - Jacksonville FL

International Classification:

H04B 126

US Classification:

455313, 455118, 455323

Abstract:

Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting and up-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (Â, 1Â, 2Â, etc. ) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal. Up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency.

US Patent:

6853690, Feb 8, 2005

Filed:

Mar 14, 2000

Appl. No.:

09/525615

Inventors:

David F. Sorrells - Jacksonville FL, US
Michael J. Bultman - Jacksonville FL, US
Robert W. Cook - Switzerland FL, US
Richard C. Looke - Jacksonville FL, US
Gregory S. Rawlins - Lake Mary FL, US
Michael W. Rawlins - Lake Mary FL, US

Assignee:

ParkerVision, Inc. - Jacksonville FL

International Classification:

H04L027/04
H04L027/12
H04L027/20

US Classification:

375295, 375298, 375259, 375256, 455 76, 455 91

Abstract:

A balanced transmitter up-converts a baseband signal directly from baseband-to-RF. The up-conversion process is sufficiently linear that no IF processing is required, even in communications applications that have stringent requirements on spectral growth. In operation, the balanced modulator sub-harmonically samples the baseband signal in a balanced and differential manner, resulting in harmonically rich signal. The harmonically rich signal contains multiple harmonic images that repeat at multiples of the sampling frequency, where each harmonic contains the necessary information to reconstruct the baseband signal. The differential sampling is performed according to a first and second control signals that are phase shifted with respect to each other. In embodiments of the invention, the control signals have pulse widths (or apertures) that operate to improve energy transfer to a desired harmonic in the harmonically rich signal. A bandpass filter can then be utilized to select the desired harmonic of interest from the harmonically rich signal.

US Patent:

6879817, Apr 12, 2005

Filed:

Mar 14, 2000

Appl. No.:

09/526041

Inventors:

David F. Sorrells - Jacksonville FL, US
Michael J. Bultman - Jacksonville FL, US
Robert W. Cook - Switzerland FL, US
Jonathan S. Jensen - Salt Lake City UT, US
Martin R. Johnson - Salt Lake City UT, US
Richard C. Looke - Jacksonville FL, US
Gregory S. Rawlins - Lake Mary FL, US
Michael W. Rawlins - Lake Mary FL, US
Robert T. Short - Salt Lake City UT, US
Jamison L Young - Roy UT, US

Assignee:

ParkerVision, Inc. - Jacksonville FL

International Classification:

H04B001/10

US Classification:

455296, 455207, 455209, 455313, 455323

Abstract:

Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein.

US Patent:

6963734, Nov 8, 2005

Filed:

Dec 12, 2002

Appl. No.:

10/317181

Inventors:

David F Sorrells - Middleburg FL, US
Michael J Bultman - Jacksonville FL, US
Robert W Cook - Switzerland FL, US
Richard C Looke - Jacksonville FL, US
Gregory S Rawlins - Heathrow FL, US
Michael W Rawlins - Lake Mary FL, US

Assignee:

Parkervision, Inc. - Jacksonville FL

International Classification:

H04B001/10

US Classification:

455296, 455326, 327113, 327356

Abstract:

Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein.

US Patent:

6975848, Dec 13, 2005

Filed:

Nov 8, 2002

Appl. No.:

10/290323

Inventors:

Gregory S. Rawlins - Heathrow FL, US
Kevin Brown - Clermont FL, US
Michael W. Rawlins - Lake Mary FL, US
David F. Sorrells - Middleburg FL, US

Assignee:

ParkerVision, Inc. - Jacksonville FL

International Classification:

H04B001/10
H04B001/06
H03F003/26

US Classification:

455307, 4552321, 4552341, 4552401, 4552501, 327553, 327559, 330270, 330303

Abstract:

A filter module for reducing a DC offset voltage in a radio frequency communication channel is described. A first capacitor is coupled between a first differential input node and a first differential output node. A second capacitor is coupled between a second differential input node and a second differential output node. An active variable resistor is coupled between the first differential output node and the second differential output node. The active variable resistor receives a control signal. The control signal adjusts the value of the active variable resistor, which adjusts the frequency response of the filter module. The rate at which the filter module reduces DC offset voltages is thereby adjusted. The filter module is also adaptable to single-ended applications.

US Patent:

7010286, Mar 7, 2006

Filed:

May 16, 2001

Appl. No.:

09/855851

Inventors:

David F. Sorrells - Middleburg FL, US
Michael J. Bultman - Jacksonville FL, US
Robert W. Cook - Switzerland FL, US
Richard C. Looke - Jacksonville FL, US
Gregory S. Rawlins - Heathrow FL, US
Michael W. Rawlins - Lake Mary FL, US

Assignee:

ParkerVision, Inc. - Jacksonville FL

International Classification:

H04B 15/00

US Classification:

455313, 455323, 455334, 455318, 327356

Abstract:

Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In embodiments, up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used in the frequency modulation or phase modulation implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate a bias signal. The output of the switch is filtered, and the desired harmonic is output.

Address:

349 Sprucewood Rd, Lake Mary, FL 32746

VIN:

WVWAK73C38E166315

Make:

VOLKSWAGEN

Model:

PASSAT

Year:

2008