Methods for reducing radiated emissions from power amplifiers

Abstract

Apparatus and methods for orienting power amplifiers are disclosed herein. In certain implementations, a method of determining the physical orientation of power amplifiers laid out on a printed circuit board (PCB) is provided. The method includes determining an amount of emissions radiated by a first power amplifier die that is positioned in a first orientation on the PCB. The method further includes determining an amount of emissions radiated by a second power amplifier die that is positioned in a second orientation on the PCB. The method further includes determining a third orientation of the second power amplifier die different than the second orientation, such that when the second power amplifier die is in the third orientation, the amount of emissions radiated by the first power amplifier die and the amount of emissions radiated by the second power amplifier die are distributed in different directions.

What is claimed is: 
     
         1 . A method of determining the physical orientation of power amplifiers laid out on a printed circuit board comprising:
 determining an amount of emissions radiated by a first power amplifier die that is positioned in a first orientation on the printed circuit board;   determining an amount of emissions radiated by a second power amplifier die that is positioned in a second orientation on the printed circuit board; and   determining a third orientation of the second power amplifier die different than the second orientation, such that when the second power amplifier die is in the third orientation, the amount of emissions radiated by the first power amplifier die and the amount of emissions radiated by the second power amplifier die are distributed in different directions.