The last decade has witnessed an increasing number of wireless standards for civil, military, and space communications. Along with the advances in integrated circuit (IC) technologies and the ever-growing requirements of high data rates, next-generation radios are expected to operate over multiple frequency bands. For example, carrier aggregation is used in LTE-Advanced radios to increase the bandwidth. However, it is challenging for traditional radios to operate over multiple frequency bands. In response to this, software-defined radios (SDRs) have been proposed to handle multiple bands through reconfiguration. They can adapt carrier frequency, transmission bandwidth, modulation, and encoding schemes by modifying digital signal processing (DSP) software algorithms [1]. In contrast to SDR, legacy communication systems are approaching their capability limits. They usually operate on a single band and require dedicated hardware. Thus, SDR is a promising radio technology to increase the flexibility of radio devices and reduce hardware and manufacturing costs, chip size, and power consumption [2].

中文翻译：

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用于软件定义无线电的多频段 LNA：CMOS、微波集成电路技术中用于 SDR 的多频段可重构 LNA 设计的最新进展


过去十年，民用、军用和太空通信的无线标准数量不断增加。随着集成电路 (IC) 技术的进步和对高数据速率的要求不断增长，下一代无线电预计将在多个频段上运行。例如，LTE-Advanced 无线电中使用载波聚合来增加带宽。然而，传统无线电在多个频段上运行具有挑战性。为此，人们提出了软件定义无线电（SDR）来通过重新配置来处理多个频段。它们可以通过修改数字信号处理 (DSP) 软件算法来调整载波频率、传输带宽、调制和编码方案 [1]。与 SDR 相比，传统通信系统正在接近其能力极限。它们通常在单个频段上运行并且需要专用硬件。因此，SDR 是一种很有前途的无线电技术，可以提高无线电设备的灵活性，并降低硬件和制造成本、芯片尺寸和功耗[2]。