29.4 High-Performance Isolators and Notch Filters Based on N-Path Negative Transresistance
29.4 High-Performance Isolators and Notch Filters Based on N-Path Negative Transresistance
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29.4 基于N路负互阻的高性能隔离器和陷波滤波器
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
H. Krishnaswamy
中科院分区：
文献类型：
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作者：
Mohammad Khorshidian;Negar Reiskarimian;H. Krishnaswamy
负电阻电路用于各种功能，包括实现振荡器和损耗补偿。有源负阻电路，如交叉耦合gm电池，可以提供功率增益，但当用于损耗补偿时，必须仔细设计以避免振荡。此外，它们还带来噪声、线性度和功耗方面的挑战。近年来，线性时变（LPTV）电路（通常使用开关电容器实现）显示出意想不到但非常理想的特性，包括可调谐高Q带通/带阻滤波[1]和非磁性非互易性[2]。在这里，我们报告的LPTV开关电容电路的无源负跨阻（NTR）属性。利用这一特性，实现了（1）一个N通道陷波滤波器与倒数负跨阻增强与理想的无限深度的路径的数量无关，（2）非磁性非互易广泛可调N通道无电感隔离器与低损耗和无限隔离在相反的方向。
Negative-resistance circuits are used for a variety of functions, including the realization of oscillators and loss compensation. Active negative-resistance circuits, such as cross-coupled gm cells, can provide power gain but, when used for loss compensation, must be carefully designed to avoid oscillation. In addition, they present noise, linearity, and power-consumption challenges. In the recent past, linear periodically-time-varying (LPTV) circuits, typically implemented using switched capacitors, have shown unexpected yet highly desirable properties, including tunable high-Q bandpass/bandstop filtering [1] and non-magnetic nonreciprocity [2]. Here, we report a passive negative-transresistance (NTR) property of LPTV switched-capacitor circuits. This property is utilized in this work to realize (1) an N-path notch filter enhanced with reciprocal negative transresistance with ideally infinite depth regardless of the number of paths and (2) a non-magnetic non-reciprocal widely tunable N-path inductorless isolator with low loss and infinite isolation in the reverse direction.