Abstract: Sets of power amplifier branches (which comprise an RF/microwave amplifier stage) are power combined within each stage and each set of power amplifier branches are biased in different classes of operation by bias circuits possessing different impedance characteristics such that the fundamental frequency components present at the output are in-phase with one another and the IMD3 components are anti-phase over a broad range of power levels. The RF input signal is provided by the output of the previous stage of the RF/microwave amplifier. The output of each stage is formed by power combining sets of these power amplifier branches, each of which are separately biased, so the fundamental components are additive resulting in the maximum possible output power and the IM3 components cancel partially or completely.
Type:
Application
Filed:
August 10, 2009
Publication date:
February 11, 2010
Applicant:
VT SILICON, INC.
Inventors:
Vikram Bidare Krishnamurthy, Tanveer Kaur Khanijoun, Kyle Mark Hershberger, Jeremy Thomas Reed, Paul Erik Pace
Abstract: Sets of power amplifier branches (which comprise an RF/microwave amplifier stage) are power combined within each stage and each set of power amplifier branches are biased in different classes of operation by bias circuits possessing different impedance characteristics such that the fundamental frequency components present at the output are in-phase with one another and the IMD3 components are anti-phase over a broad range of power levels. The RF input signal is provided by the output of the previous stage of the RF/microwave amplifier. The output of each stage is formed by power combining sets of these power amplifier branches, each of which are separately biased, so the fundamental components are additive resulting in the maximum possible output power and the IM3 components cancel partially or completely.
Type:
Grant
Filed:
February 9, 2007
Date of Patent:
August 11, 2009
Assignee:
VT Silicon, Inc.
Inventors:
Vikram Bidare Krishnamurthy, Tanveer Kaur Khanijoun, Kyle Mark Hershberger, Jeremy Thomas Reed, Paul Erik Pace
Abstract: Sets of power amplifier branches (which comprise an RF/microwave amplifier stage) are power combined within each stage and each set of power amplifier branches are biased in different classes of operation by bias circuits possessing different impedance characteristics such that the fundamental frequency components present at the output are in-phase with one another and the IMD3 components are anti-phase over a broad range of power levels. The RF input signal is provided by the output of the previous stage of the RF/microwave amplifier. The output of each stage is formed by power combining sets of these power amplifier branches, each of which are separately biased, so the fundamental components are additive resulting in the maximum possible output power and the IM3 components cancel partially or completely.
Type:
Application
Filed:
February 9, 2007
Publication date:
September 27, 2007
Applicant:
VT SILICON, INC.
Inventors:
Vikram Krishnamurthy, Tanveer Khanijoun, Kyle Hershberger, Jeremy Reed, Paul Pace