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[IEEE 2018 IEEE International Ultrasonics Symposium (IUS) - Kobe, Japan (2018.10.22-2018.10.25)] 2018 IEEE International Ultrasonics Symposium (IUS) - A Hybrid 3D Thermal / 1D Piezoelectric Finite Element Model for Rapid Simulation of FBAR Filter Response Under High Power
摘要： The increasingly stringent power requirements imposed on BAW filter technologies has made coupling between thermal and piezoelectric physics relevant to the design process. Existing lumped filter models do not account for the effect of a 3D temperature distribution over each resonator. Here we report a new finite element based method for rapid simulation of filter response under high power that captures the effect of heat flow within the filter die as well as its path through the PCB to thermal ground.
关键词： thermo-piezoelectric,BAW,self-heating,nonlinear,FBAR,FEM,fully coupled
更新于2025-09-23 15:22:29
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Class-C architecture for cross-coupled FBAR oscillator to further improve phase noise
摘要： In this letter, a class-C architecture for an oscillator employing film bulk acoustic resonator (FBAR) is presented to improve the phase noise significantly in 1/f 3 region. The advantages offers by class-C operation are exploited in order to reduce the noise contributed by the current-source transistor in cross-coupled topology. An adaptive biasing circuit is used in order to ensure the oscillation start-up. The post-layout simulation incorporating all parasitic and representing FBAR by modified Butterworth Van Dyke (MBVD) model illustrates the phase noise improvement by 17 dBc/Hz at 100 kHz offset of a 1.9 GHz carrier compared to the FBAR based cross-coupled topology presented by the authors [1].
关键词： FBAR,class-C oscillator,cross-coupled topology
更新于2025-09-12 10:27:22