Dennis M Drees

US Patent:

59329530, Aug 3, 1999

Filed:

Jun 30, 1997

Appl. No.:

8/884991

Inventors:

Dennis M. Drees - Schaumburg IL
Howard R. Shanks - Ames IA
Richard A. Van Deusen - Ames IA
Allen R. Landin - Boone IA

Assignee:

Iowa State University Research Foundation, Inc. - Ames IA

International Classification:

H01L 4108

US Classification:

310324

Abstract:

A method and system for detecting material bound on a surface of a piezoelectric resonator introduces a signal of a constant frequency through the sensing resonator and detects a change in the insertion phase shift of the resonator as a result of the binding of the material being detected on the surface of the resonator. Environmental effects on the measurement are effectively canceled by the use of a reference resonator driven by the same input signal. A multiple-port sensing device is provided which includes thin-film sensing and reference resonators monolithically formed on a substrate.

US Patent:

20220286151, Sep 8, 2022

Filed:

Mar 5, 2021

Appl. No.:

17/193939

Inventors:

- Chicago IL, US
Gregory J. Buchwald - Crystal Lake IL, US
Dennis M. Drees - Deer Park IL, US
In S. Kim - Buffalo Grove IL, US
Arthur Christopher Leyh - Spring Grove IL, US

International Classification:

H04B 1/04
H04B 17/318
H04B 1/10

Abstract:

Apparatus and method for linearizing narrowband carriers with low resolution predistorters are provided. The method includes amplifying, using a power amplifier, one or more broadcast carriers and linearizing, using a predistorter coupled to the power amplifier, the one or more broadcast carriers. The method also includes determining, using an electronic processor, a composite bandwidth of the one or more broadcast carriers and determining, using the electronic processor, whether the composite bandwidth is below a modulation bandwidth of the predistorter. The method further includes controlling, using the electronic processor, a pacification carrier generator coupled to the electronic processor to combine a pacification carrier with the one or more broadcast carriers when the composite bandwidth is below the minimum modulation bandwidth of the predistorter.

US Patent:

20200204118, Jun 25, 2020

Filed:

Dec 21, 2018

Appl. No.:

16/231353

Inventors:

- Chicago IL, US
Mitchell R. Blozinski - Lake In The Hills IL, US
Dennis M. Drees - Deer Park IL, US

International Classification:

H03F 1/02
H03F 3/24
H04B 1/04
H03F 1/32

Abstract:

Apparatus and method for selective linearization of scalable fault tolerant frequency agile transmitters. In one embodiment, the method includes receiving timestamped carrier configurations and segmenting the timestamped carrier configurations into time segments having a pre-determined time length. The method also includes determining composite carrier configuration in a present time segment for a predetermined number of future time segments and determining a correction solution of a plurality of correction solutions associated with the composite carrier configuration in a mapping of a plurality of carrier configurations and the plurality of correction solutions. The method includes providing the correction solution to a linearizer of at least one of a plurality of multi-carrier power amplifiers. The plurality of power amplifiers are provided in one or more banks of multi-carrier power amplifiers.

Address:

1605 Chesapeake Dr, Hoffman Estates, IL 60192

Phone:

8479638522

VIN:

1GKKRRED8BJ184040

Make:

GMC

Model:

ACADIA

Year:

2011