A Simple Method for the Measurement of the Phase and Power of 3rd-Order Inter-Modulation Components of the Output of Multi-Stage Power Amplifiers(Active Devices and Circuits)(<Special Section>Advances in Characterization and Measurement Technologies for M

概要

論文の詳細を見る
A simple method has been proposed for the measurement of the output power and phase characteristics of the 3rd-order inter-modulation distortion (IMS) components appearing in multistage power amplifiers. By adopting a unique definition of the phase for the IM3 components that is independent of the delay time caused by transmission lines and other instrument devices, it is possible to measure the phase, merely by using a vector signal analyzer. It is demonstrated that an accurate estimation of the IMS characteristics of two-stage cascaded power amplifiers for cellular radio handheld terminals can be made by using the IMS characteristics of the 1st and 2nd-stage amplifiers as measured by the proposed method. The results indicate that it is possible to reduce the dissipation power by 18% at 28 dBm RF output power with respect to conventional measurement methods. Further studies show that the error in the resultant vector of the estimated IMS is less than 1 dB, when the asymmetry characteristics of the IMS sidebands in the 2nd-stage amplifier are less than 7.3%.
社団法人電子情報通信学会の論文
2004-05-01