ANDREW MUNROE TEETZEL
Pilots in Wilson, WY
License number
Wyoming A3982559
Issued Date
Oct 2015
Expiration Date
Oct 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
PO Box 1301, Wilson, WY 83014
Professional information
Rf System Linearizer Using Controlled Complex Nonlinear Distortion Generators
US Patent:
2010003, 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
US Patent:
2010022, 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.
Automatic Rc/Cr Quadrature Network
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 I/Q Modulator With Sampling Calibration System
US Patent:
2012029, 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
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.