Collado Carlos, Gonzalez-Rodriguez Marta, Mateu Jordi, Perea-Robles Rafael, Aigner Robert
IEEE Trans Ultrason Ferroelectr Freq Control. 2021 May;68(5):1907-1918. doi: 10.1109/TUFFC.2020.3046256. Epub 2021 Apr 26.
This work presents a new method to analyze weak distributed nonlinear (NL) effects, with a focus on the generation of harmonics (H) and intermodulation products (IMD) in bulk acoustic wave (BAW) resonators and filters composed of them. The method consists of finding equivalent current sources [input-output equivalent sources (IOES)] at the H or IMD frequencies of interest that are applied to the boundary nodes of any layer that can contribute to the nonlinearities according to its local NL constitutive equations. The new methodology is compared with the harmonic balance (HB) analysis, by means of a commercial tool, of a discretized NL Mason model, which is the most used model for NL BAW resonators. While the computation time is drastically reduced, the results are fully identical. For the simulation of a seventh-order filter, the IOES method is around 700 times faster than the HB simulations.
这项工作提出了一种分析弱分布式非线性（NL）效应的新方法，重点关注体声波（BAW）谐振器及其组成的滤波器中谐波（H）和互调产物（IMD）的产生。该方法包括在感兴趣的H或IMD频率处找到等效电流源[输入-输出等效源（IOES）]，这些电流源根据其局部NL本构方程应用于任何可能导致非线性的层的边界节点。通过商业工具，将新方法与离散化NL梅森模型的谐波平衡（HB）分析进行了比较，离散化NL梅森模型是NL BAW谐振器最常用的模型。虽然计算时间大幅减少，但结果完全相同。对于七阶滤波器的仿真，IOES方法比HB仿真快约700倍。
