A Study on the Improvement of Intermodulation Distortion for Multistage Microwave Two-port Networks

다단 마이크로파 2-포트 회로망의 상호변조 왜곡 개선에 관한 연구

The analysis of the two-tone intermodulation distortion of multistage two-ports with gain and mismatching losses is presented with simplified two-port analyses and statistical viewpoint. The uncertainty obtained from unknown phase angles of the intermodulation distortion signals to the system designer is reduced using stochastic process, hence improving the accuracy of the solution. Based on the dc power dependance of third-order intercept point of each stage, the new efficient method for improving the total intercept point is also suggested with only the relation of dc power and available power gain criteria. Experimental verification on specific amplifiers used for cellular mobile communication comparing predicted and measured intercept points for various power conditions is presented.