公开(公告)号：US20230101673A1

公开(公告)日：2023-03-30

申请号：US17471535

申请日：2021-09-10

Applicant: Northrop Grumman Systems Corporation

Inventor： Manouchehr Ghanevati ,  Mansoor K. Siddiqui ,  David J. Miller ,  Michael Herndon

IPC: H03F1/32 ,  H03F1/02 ,  H03F3/19 ,  H03F1/42

Abstract: An RF amplifier utilizes first and second main amplifiers in a balanced amplifier configuration with first and second auxiliary amplifiers connected in parallel across the first and second main amplifiers, respectively. The main and the auxiliary amplifiers are biased such that the third-order nonlinearity components in the combined output current are reduced. A common or independent bias control circuit(s) control(s) the DC operating bias of the auxiliary amplifiers and establishes DC operating points on curves representing third-order nonlinear components within the drain current having a positive slope (opposite to the corresponding slope of the main amplifiers). This results in reduction of overall third-order nonlinear components in combined currents at the output. In another embodiment, a phase shift of an input to one auxiliary amplifier is used to provide a peak in minimization at a frequency associated with the phase shift.

公开(公告)号：US20240421776A1

公开(公告)日：2024-12-19

申请号：US18819096

申请日：2024-08-29

Applicant: Northrop Grumman Systems Corporation

Inventor： Manouchehr Ghanevati ,  Mansoor K. Siddiqui ,  David J. Miller ,  Michael Herndon

IPC: H03F1/32 ,  H03F1/02 ,  H03F1/42 ,  H03F3/19

Abstract: An RF amplifier utilizes first and second main amplifiers in a balanced amplifier configuration with first and second auxiliary amplifiers connected in parallel across the first and second main amplifiers, respectively. The main and the auxiliary amplifiers are biased such that the third-order nonlinearity components in the combined output current are reduced. A common or independent bias control circuit(s) control(s) the DC operating bias of the auxiliary amplifiers and establishes DC operating points on curves representing third-order nonlinear components within the drain current having a positive slope (opposite to the corresponding slope of the main amplifiers). This results in reduction of overall third-order nonlinear components in combined currents at the output. In another embodiment, a phase shift of an input to one auxiliary amplifier is used to provide a peak in minimization at a frequency associated with the phase shift.

公开(公告)号：US12088259B2

公开(公告)日：2024-09-10

申请号：US17471535

申请日：2021-09-10

Applicant: Northrop Grumman Systems Corporation

Inventor： Manouchehr Ghanevati ,  Mansoor K. Siddiqui ,  David J. Miller ,  Michael Herndon

IPC: H03F1/32 ,  H03F1/02 ,  H03F1/42 ,  H03F3/19

CPC classification number: H03F1/32 ,  H03F1/0205 ,  H03F1/42 ,  H03F3/19 ,  H03F2200/36 ,  H03F2200/451

Abstract: An RF amplifier utilizes first and second main amplifiers in a balanced amplifier configuration with first and second auxiliary amplifiers connected in parallel across the first and second main amplifiers, respectively. The main and the auxiliary amplifiers are biased such that the third-order nonlinearity components in the combined output current are reduced. A common or independent bias control circuit(s) control(s) the DC operating bias of the auxiliary amplifiers and establishes DC operating points on curves representing third-order nonlinear components within the drain current having a positive slope (opposite to the corresponding slope of the main amplifiers). This results in reduction of overall third-order nonlinear components in combined currents at the output. In another embodiment, a phase shift of an input to one auxiliary amplifier is used to provide a peak in minimization at a frequency associated with the phase shift.