Radio Frequency Angular Momentum Biased Quasi-LTI Nonreciprocal Acoustic Filters
Radio Frequency Angular Momentum Biased Quasi-LTI Nonreciprocal Acoustic Filters
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射频角动量偏置准 LTI 非互易声学滤波器
DOI：
10.1109/tuffc.2019.2931121
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
M. Rinaldi
中科院分区：
文献类型：
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作者：
C. Cassella;Giuseppe Michetti;Michele Pirro;Yao Yu;Ahmed Kord;D. Sounas;A. Alú;M. Rinaldi
我们报告了在射频 (RF) 范围内运行的新型不可逆声滤波器的设计和操作。这些器件利用放置在角动量偏置网络中的商用声滤波器的频谱特性来实现大的非互易性、低插入损耗 (I.L.) 和宽带操作。由于声滤波器表现出高抑制能力，这些新颖的器件可以实现对不需要的互调产物的前所未有的抑制，从而接近传统线性时不变（LTI）滤波组件所获得的频谱纯度。此外，还提出了一种新的分析模型，适用于捕获任何角动量偏置的不可逆装置的行为。该模型使我们能够识别与此类新型不可逆滤波器相关的传递函数（极点和零点）的主要特征，从而通过标准数值方法实现新的合成功能。最终，报告了构建的 1.1 GHz 非互易声滤波器原型的性能。该器件依赖于通过开关电容器实现的调制，并显示通过使用 40 MHz 调制频率实现的 I.L.、隔离度和半功率带宽值分别为 4.5 dB、28 dB 和 20 MHz。此外，通过显示低于-34 dBc的互调失真，它接近LTI电路的操作。
We report on the design and operation of a novel class of nonreciprocal acoustic filters operating in the radio frequency (RF) range. These devices use the spectral characteristics of commercial acoustic filters placed in angular momentum biased networks to achieve large nonreciprocity, low insertion loss (I.L.), and wideband operation. Owing to the high rejection exhibited by acoustic filters, these novel devices can achieve an unprecedented suppression of undesired intermodulation products, thus approaching the spectral purity attained by conventional linear-time-invariant (LTI) filtering components. In addition, a new analytical model suitable to capture the behavior of any angular-momentum-biased nonreciprocal device is presented. This model allows us to identify the main characteristics of the transfer function (poles and zeroes) relative to this new class of nonreciprocal filters, thus enabling new synthesis capabilities through standard numerical methods. Ultimately, the performance of a built 1.1-GHz nonreciprocal acoustic filter prototype is reported. This device relies on a modulation implemented through switched capacitors and shows I.L., isolation, and half-power bandwidth values of 4.5 dB, 28 dB, and 20 MHz, respectively, achieved through the use of a 40-MHz modulation frequency. Moreover, by showing an intermodulation distortion lower than −34 dBc, it approaches the operation of LTI circuits.
DOI：
10.1109/isscc.2017.7870377
发表时间：
2017-02
期刊：
2017 IEEE International Solid-State Circuits Conference (ISSCC)
影响因子：
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作者：
T. Dinc;H. Krishnaswamy
通讯作者：
T. Dinc;H. Krishnaswamy