Optimum Matching Technique for the Switch Design

Abstract

The theoretical background and hardware implementation of optimal matching filters designed to minimize harmonic generation by RF switches and provide harmonic filtering of the PA generated harmonics is presented. The switch with the optimally matched filters shows 5-7 dB improvements in harmonics generated under high VSWR, leading to better than -39dBm harmonics at 35/33 dBm for all phases of VSWR=5:1 for low/high band GSM applications. This technique leads to a fully integrated solution offering both improved harmonics performance and reduced size.