Saw duplexer design for WCDMA system

Abstract

Some relations between sensitivity performances and duplexer performances (losses, isolations between Tx and Rx terminals) are obtained. We simulate system noise figure levels from duplexer performances and low noise amplifier parameters by using a nonlinear NF model at the viewpoint of a system design. A nonlinear equivalent circuit model is proposed for analyzing distortion of SAW duplexer. Inter modulation distortion parameters are directly calculated by using the above nonlinear model. Consequently, desired duplexer performances to achieve sufficient system performances of WCDMA terminals can be determined by these procedures.

A nonlinear elastic model for predicting triple beat in SAW duplexers

“…However, this approach cannot directly predict the nonlinear responses of SAW duplexers. Recently, the nonlinear distortion of SAW duplexers has been analyzed by using the equivalent circuit model [6], [7]. Reference [7] simulated the frequency responses of the 3rd order nonlinear distortion in SAW duplexers such as the 3rd order harmonic generation, IMD3, and triple beat by using the nonlinear Butterworth-Van Dyke (BVD) model.…”