Alan L Westwick from 405 E 10Th St, Georgetown, TX 78626, age 63

Circuit And Method Of Establishing Dc Bias Levels In An Rf Power Amplifier
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US Patent:

7064605, Jun 20, 2006
Filed:

Dec 22, 2003
Appl. No.:

10/743221
Inventors:

Alan L. Westwick - Austin TX, US
Susanne A. Paul - Austin TX, US
Assignee:

Silicon Laboratories Inc. - Austin TX
International Classification:

H03F 1/34
H03G 3/20
US Classification:

330 85, 330136
Abstract:

A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noise, and to reduce the noise transfer function in a power amplifier.

Power Amplifier Input Structure Having A Differential Output
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US Patent:

7113045, Sep 26, 2006
Filed:

Dec 22, 2003
Appl. No.:

10/743219
Inventors:

Alan L. Westwick - Austin TX, US
Timothy J. Dupuis - Austin TX, US
Susanne A. Paul - Austin TX, US
Assignee:

Silicon Laboratories Inc. - Austin TX
International Classification:

H03F 3/04
US Classification:

330301, 330135, 330165, 330188
Abstract:

A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to maintain a constant input impedance. The predriver includes a limiting amplifier that provides isolation between the power amplifier and the RF input. A DC feedback circuit is used by the predriver that maintains the DC level of the inverters to a desired level.

Input Structure For A Power Amplifier And Associated Methods
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US Patent:

7161427, Jan 9, 2007
Filed:

Dec 22, 2003
Appl. No.:

10/743220
Inventors:

Alan L. Westwick - Austin TX, US
Timothy J. Dupuis - Austin TX, US
Susanne A. Paul - Austin TX, US
Assignee:

Silicon Laboratories Inc. - Austin TX
International Classification:

H03F 1/00
US Classification:

330165, 330293, 330135
Abstract:

A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to maintain a constant input impedance. The predriver includes a limiting amplifier that provides isolation between the power amplifier and the RF input. A DC feedback circuit is used by the predriver that maintains the DC level of the inverters to a desired level.

Circuit And Method Of Reducing Noise In An Rf Power Amplifier
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US Patent:

7212070, May 1, 2007
Filed:

Dec 22, 2003
Appl. No.:

10/743217
Inventors:

Alan L. Westwick - Austin TX, US
Susanne A. Paul - Austin TX, US
Assignee:

Silicon Laboratories Inc. - Austin TX
International Classification:

H03F 1/24
US Classification:

330 98, 330269, 330277
Abstract:

A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noise, and to reduce the noise transfer function in a power amplifier.

Circuit And Method Of Establishing Dc Bias Levels In An Rf Power Amplifier
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US Patent:

7233199, Jun 19, 2007
Filed:

Mar 30, 2006
Appl. No.:

11/278078
Inventors:

Alan L. Westwick - Austin TX, US
Susanne A. Paul - Austin TX, US
Assignee:

Silicon Laboratories Inc. - Austin TX
International Classification:

H03F 1/36
US Classification:

330 85, 330290
Abstract:

A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noise, and to reduce the noise transfer function in a power amplifier.

Input Structure For A Power Amplifier And Associated Methods
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US Patent:

7372327, May 13, 2008
Filed:

Mar 11, 2006
Appl. No.:

11/373053
Inventors:

Alan L. Westwick - Austin TX, US
Timothy J. Dupuis - Austin TX, US
Susanne A. Paul - Austin TX, US
Assignee:

Silicon Laboratories Inc. - Austin TX
International Classification:

H03F 1/00
US Classification:

330165, 330 85, 330135, 330293
Abstract:

A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to maintain a constant input impedance. The predriver includes a limiting amplifier that provides isolation between the power amplifier and the RF input. A DC feedback circuit is used by the predriver that maintains the DC level of the inverters to a desired level.

Precise Frequency Generation For Low Duty Cycle Transceivers Using A Single Crystal Oscillator
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US Patent:

7421251, Sep 2, 2008
Filed:

Mar 31, 2005
Appl. No.:

11/095229
Inventors:

Alan L. Westwick - Austin TX, US
Douglas R. Holberg - Wimberley TX, US
Assignee:

Silicon Laboratories Inc. - Austin TX
International Classification:

H04B 1/40
US Classification:

455 85, 455574, 455 86, 455141, 343 16
Abstract:

An apparatus and method for calibrating a non-crystal oscillator in a transceiver unit using a crystal-oscillator includes the step of establishing a time base based upon oscillations of the crystal oscillator. A comparison of the number of oscillations for the non-crystal oscillator and the crystal oscillator is made during a known time period is made. An adjustment is determined based upon the established time base and the compared number of oscillations. The transceiving of the transceiver unit is then controlled based upon this adjustment.

Power Amplifier Input Structure Having A Differential Output
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US Patent:

7446613, Nov 4, 2008
Filed:

Aug 30, 2006
Appl. No.:

11/468383
Inventors:

Alan L. Westwick - Austin TX, US
Timothy J. Dupuis - Austin TX, US
Susanne A. Paul - Austin TX, US
Assignee:

Black Sand Technologies, Inc. - Austin TX
International Classification:

H03F 3/04
US Classification:

330311, 330301, 330135, 330165, 330188
Abstract:

A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to maintain a constant input impedance. The predriver includes a limiting amplifier that provides isolation between the power amplifier and the RF input. A DC feedback circuit is used by the predriver that maintains the DC level of the inverters to a desired level.