Andrew M Teetzel from Wilson, WY, age 68

Name / Title

Company / Classification

Phones & Addresses

Andrew Teetzel
Manager

Linear Radio Company, LLC
Mfg Radio/TV Communication Equipment

7100 W Trl Crk Rd, Wilson, WY 83014

Resumes

President And Chief Executive Officer

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Location:

P/O Box 1301, Wilson, WY

Industry:

Research

Work:

Linear Radio Company
President and Chief Executive Officer
Agilent Technologies Sep 1983 - Feb 2006
Engineer

Education:

University of Illinois at Urbana - Champaign 1982 - 1983
Master of Science, Masters Purdue University 1975 - 1979
Bachelors, Bachelor of Science, Electronics Engineering, Electronics

Skills:

Rf Engineering
Electronics
Integrated Circuit Design

Us Patents

Automatic Rc/Cr Quadrature Network
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US Patent:

8269543, Sep 18, 2012
Filed:

Oct 23, 2007
Appl. No.:

12/446743
Inventors:

Andrew M. Teetzel - Wilson WY, US
International Classification:

H03H 11/16
US Classification:

327254, 327233, 327237
Abstract:

A stabilized quadrature RC/CR phase shifting network for generating quadrature RF and microwave signals. The network uses offset biasing of postamplifiers following the phaseshifter to fine tune quadrature-phase, and further uses an output quadrature-phase detector to stabilize quadrature-phase with negative feedback by using the quadrature-phase error signal to drive the quadrature-phase fine tuning control. In an alternative embodiment, the stability of quadrature-phase can be enhanced without the output quadrature-phase detector by making the quadrature-phase fine tuning control dependent upon the amplitude-difference negative feedback error signal.

Rf System Linearizer Using Controlled Complex Nonlinear Distortion Generators
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US Patent:

20100039174, Feb 18, 2010
Filed:

Oct 23, 2007
Appl. No.:

12/446748
Inventors:

Andrew M. Teetzel - Wilson WY, US
Assignee:

LINEAR RADIO COMPANY, LLC - WILSON WY
International Classification:

H03F 1/26
US Classification:

330149
Abstract:

A linearizer reduces nonlinear intermodulation distortion in radio frequency and microwave systems by first directly generating in-phase and quadrature nonlinear intermodulation products of the system input. Controllable amounts of each phase are then added back into the system such that the vector sum of nonlinear intermodulation products at the output is reduced or eliminated by destructive interference, while the fundamentals are substantially unaffected. The quadrature distorted signals are generated with two lightly-biased and thus overdriven differential pairs having gain-determining degeneration impedances that are in quadrature with each other The amount of each quadrature phase summed to the output is controlled with electronically tunable four-quadrant variable attenuators. The quadrature phasing enables rapidly convergent tuning to minimize distortion using conventional scalar spectral analysis. The advantages of a linearizer using rectangular vector coordinate system are significant.

High Efficiency Rf System Linearizer Using Controlled Complex Nonlinear Distortion Generators
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US Patent:

20100225389, Sep 9, 2010
Filed:

Mar 9, 2009
Appl. No.:

12/400764
Inventors:

Andrew M. Teetzel - Wilson WY, US
International Classification:

H03F 1/26
US Classification:

330149
Abstract:

A linearizer reduces nonlinear intermodulation distortion in radio frequency and microwave systems by first directly generating in-phase and quadrature nonlinear intermodulation products of the system input. Controllable amounts of each phase are then added back into the system such that the vector sum of nonlinear intermodulation products at the output is reduced or eliminated by destructive interference, while the fundamentals are substantially unaffected. The quadrature distorted signals are generated with two lightly-biased and thus overdriven differential pairs having gain-determining degeneration impedances that are in quadrature with each other. The amount of each quadrature phase summed to the output is controlled with electronically tunable four-quadrant variable attenuators. The quadrature phasing enables rapidly convergent tuning to minimize distortion using conventional scalar spectral analysis. The advantages of a linearizer using rectangular vector coordinate system are significant.

Rf I/Q Modulator With Sampling Calibration System
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US Patent:

20120294343, Nov 22, 2012
Filed:

May 16, 2011
Appl. No.:

13/108786
Inventors:

Andrew M. Teetzel - Wilson WY, US
Panagiotis Pete Pragastis - Los Gatos CA, US
Charanbir S. Mahal - San Jose CA, US
Assignee:

Phase Matrix, Inc. - San Jose CA
International Classification:

H04B 17/00
US Classification:

375224
Abstract:

A vector RF modulation system includes a sampling receiver that monitors modulator RF output and provides IF signals for a processor that calculates modulator calibration parameters.

Rc/Cr Automatic Quadrature Network
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US Patent:

56442602, Jul 1, 1997
Filed:

Oct 13, 1995
Appl. No.:

8/542745
Inventors:

Marcus K. DaSilva - Newman Lake WA
Andrew M. Teetzel - Healdsburg CA
Assignee:

Hewlett-Packard Company - Palo Alto CA
International Classification:

H03H 720
H03H 721
US Classification:

327238
Abstract:

An IQ modulator incorporates a quadrature network that is responsive to a frequency dependent control signal and that has in-phase and quadrature signals that are of equal amplitude and in exact quadrature over a wide range of applied frequencies. The quadrature network includes RC and CR phase shifters whose C's are fixed capacitors of equal value and whose R's are made equal to each other and to the capacitive reactance of the C's by the action of the frequency dependent control signal. The R's may be FET's. The frequency dependent control signal may be generated without express knowledge of the applied frequency by a servo loop that nulls out the amplitude difference between the in-phase and quadrature outputs from the quadrature network; it may also be generated from a look-up table as an express function of frequency. The frequency dependent control signal is split into separate instances that are applied to each R, and an offset may be introduced therebetween to provide extreme precision. The offset may be fixed or programmatically controlled as a function of frequency.

Wideband Iq Modulator With Rc/Cr Automatic Quadrature Network
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US Patent:

56940939, Dec 2, 1997
Filed:

Nov 7, 1995
Appl. No.:

8/550546
Inventors:

Marcus K. DaSilva - Newman Lake WA
Andrew M. Teetzel - Healdsburg CA
Assignee:

Hewlett-Packard Company - Palo Alto CA
International Classification:

H04L 2736
US Classification:

332103
Abstract:

An IQ modulator incorporates a quadrature network that is responsive to a frequency dependent control signal and that has in-phase and quadrature signals that are of equal amplitude and in exact quadrature over a wide range of applied frequencies. The quadrature network includes RC and CR phase shifters whose C's are fixed capacitors of equal value and whose R's are made equal to each other and to the capacitive reactance of the C's by the action of the frequency dependent control signal. The R's may be FET's. The frequency dependent control signal may be generated without express knowledge of the applied frequency by a servo loop that nulls out the amplitude difference between the in-phase and quadrature outputs from the quadrature network; it may also be generated from a look-up table as an express function of frequency. The frequency dependent control signal is split into separate instances that are applied to each R, and an offset may be introduced therebetween to provide extreme precision. The offset may be fixed or programmatically controlled as a function of frequency.