James Christopher Moniz

US Patent:

6373339, Apr 16, 2002

Filed:

Jun 14, 2001

Appl. No.:

09/879933

Inventors:

Phillip Antognetti - Chelmsford MA
Jim Griffiths - Londonderry NH
David Helms - Tyngsboro MA
James Moniz - Poughquag NY
Scott Munro - Wilmington MA
Joshua Park - Madford MA
Carl Stuebing - The Dalles OR
Xiangdong Zhang - Westford MA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03F 304

US Classification:

330296, 323313

Abstract:

A bias network for a radio frequency signal power amplifier. A current source is connected to a source of band gap voltage and produces a current proportional to the voltage. A reference voltage circuit receives the current and produces a voltage which is proportional to the current, as well as changes in temperature. An operational amplifier is used to connect the reference voltage to the power amplifier, so that the power amplifier is effectively isolated from the reference voltage circuit and current bearer circuit. A power amplifier breakdown protection circuit is connected across the output of the operational amplifier for diverting avalanche current produced form the power amplifier away from the power amplifier when the power amplifier output is mismatched through the antenna. Baseband signal transmission from the power amplifier to the bias network circuit is also significantly reduced, thus avoiding the generation of spurious radiation components.

US Patent:

62593242, Jul 10, 2001

Filed:

Jun 23, 2000

Appl. No.:

9/599516

Inventors:

Phillip Antognetti - Chelmsford MA
Jim Griffiths - Londonberry NH
David Helms - Tyngsboro MA
James Moniz - Poughquag NY
Scott Munro - Wilmington MA
Joshua Park - Madford MA
Carl Stuebing - The Dalles OR
Xiangdong Zhang - Westford MA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03F 304

US Classification:

330296

Abstract:

A bias network for a radio frequency signal power amplifier. A current source is connected to a source of band gap voltage and produces a current proportional to the voltage. A reference voltage circuit receives the current and produces a voltage which is proportional to the current, as well as changes in temperature. An operational amplifier is used to connect the reference voltage to the power amplifier, so that the power amplifier is effectively isolated from the reference voltage circuit and current bearer circuit. A power amplifier breakdown protection circuit is connected across the output of the operational amplifier for diverting avalanche current produced form the power amplifier away from the power amplifier when the power amplifier output is mismatched through the antenna. Baseband signal transmission from the power amplifier to the bias network circuit is also significantly reduced, thus avoiding the generation of spurious radiation components.