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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Thermal behavior of BAW filters at high RF power levels
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Thermal behavior of BAW filters at high RF power levels

机译：高射频功率下BAW滤波器的热性能

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摘要

The temperature increase of bulk acoustic wave filters at high RF power levels has been investigated. Self-heating due to power dissipation in the filter leads to a nonuniform frequency shift of the insertion loss. At the right filter skirt, self-heating is amplified by the negative temperature coefficient of frequency. We demonstrate that at high RF power levels, this can cause thermal instabilities resulting in an abrupt step in the insertion loss. A novel frequency transformation is introduced to describe the nonuniform frequency shift of the insertion loss as well as the thermal instabilities. A condition for the occurrence of thermal instabilities is derived. It is argued that because of this nonuniform frequency shift at high power levels, accelerated lifetime tests can overestimate the lifetime, if the stress frequency is not compensated for self-heating. Here, the frequency transformation is used to determine the stress frequencies at high RF power levels from low-power S-parameter measurements.
机译：已经研究了高射频功率下体声波滤波器的温度升高。滤波器功耗导致的自发热导致插入损耗的频率偏移不均匀。在右边的滤光片裙处，自发热会因频率的负温度系数而放大。我们证明，在高RF功率水平下，这会引起热不稳定性，从而导致插入损耗突然增加。引入一种新颖的频率变换来描述插入损耗的不均匀频移以及热不稳定性。推导出发生热不稳定性的条件。有人认为，由于在高功率水平上这种不均匀的频移，如果应力频率不能补偿自热，加速的寿命测试会高估寿命。此处，频率变换用于根据低功率S参数测量确定高RF功率水平下的应力频率。

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