This paper presents a second-order complex baseband operational transconductance amplifier-capacitor (OTA-C) filter design for wireless receivers. It employs a novel adaptive biasing circuit for large-signal linearization that extends the filter's usable signal swing range. An analysis of this linearization technique provides insights into its underlying concepts to assist the design process. The method is demonstrated with the first experimental evaluation of a second-order complex baseband filter prototype having a center frequency of 2 MHz and a bandwidth of 850 KHz. Fabricated in a standard 130nm CMOS technology, the filter prototype measurement results show a gain of 35.1 dB and an image rejection ratio of 39.7 dB while operation from a supply voltage of 0.95 V and consuming 0.13 mA. This design advances the low-power bandpass filter state-of-the-art by having an in-band and out-of-band SFDR of 62 dB and 64 dB respectively due to the use of the large-signal linearization approach.

中文翻译：

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低功耗复杂 OTA-C 滤波器大信号线性化的分析和实验验证


本文提出了一种用于无线接收器的二阶复基带运算跨导放大器电容器 (OTA-C) 滤波器设计。它采用新颖的自适应偏置电路来实现大信号线性化，从而扩展了滤波器的可用信号摆幅范围。对这种线性化技术的分析可以深入了解其基本概念，以协助设计过程。该方法通过对中心频率为 2 MHz、带宽为 850 KHz 的二阶复基带滤波器原型的首次实验评估进行了演示。该滤波器原型采用标准 130nm CMOS 技术制造，测量结果显示，在 0.95V 电源电压和 0.13mA 电流下工作时，增益为 35.1dB，镜像抑制比为 39.7dB。由于使用了大信号线性化方法，该设计的带内和带外 SFDR 分别为 62 dB 和 64 dB，从而提升了低功率带通滤波器的技术水平。