Effective suppression method for 2nd nonlinear signals of SAW devices

R. Nakagawa, Haruki Kyoya, H. Shimizu, T. Kihara
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引用次数: 9

Abstract

Linearity performances are getting one of the most important characteristics of surface acoustic wave (SAW) duplexers because nonlinear signals generated in RF front-end of cellar phone handsets deteriorate the receiver sensitivities significantly. In this paper, the generation mechanisms of the 2nd order nonlinear signals of SAW resonators/duplexers on a 42°Y-X LiTaO3 substrate and an effective suppression method for them are discussed. The crystalline asymmetry properties of substrates are focused on as the one possibility of the occurrence factor of the 2nd order nonlinear signals. Additionally, based on this hypothesis, an interdigital transducer (IDT) design which realizes the cancellation of the crystalline asymmetry effect is proposed to improve the linearity. As the result, the 2nd order harmonics level of the one-port SAWresonators and the 2nd order intermodulation distortion (IMD2) levels of the SAW duplexers have been improved up to about 25dBm and 20dBm, respectively.
SAW器件二阶非线性信号的有效抑制方法
由于蜂窝电话射频前端产生的非线性信号会严重影响接收机的灵敏度,线性性能成为表面声波双工器最重要的特性之一。本文讨论了42°Y-X LiTaO3衬底上SAW谐振器/双工器二阶非线性信号的产生机理和有效的抑制方法。衬底的晶体不对称特性作为二阶非线性信号发生的一种可能因素而受到关注。此外,基于这一假设,提出了一种消除晶体不对称效应的数字间换能器(IDT)设计,以提高线性度。结果表明,单端口SAW谐振器的二阶谐波电平和SAW双工器的二阶互调失真(IMD2)电平分别提高到约25dBm和20dBm。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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