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A Wideband Saw-Less Transmitter Operating in Closed-Loop With Embedded N-Path Filtering

机译：闭环工作，具有嵌入式N路径滤波的宽带无锯齿发射机

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The New Radio interface for 5G communications below 6 GHz need to support channels with bandwidths of up to 100 MHz. In the proposed transmitter, a passive mixer, located after a passive base-band stage, performs up-conversion and direct recombination of the I and Q signal in the current domain. This is done at the virtual ground of a closed-loop RF transimpedance amplifier (TIA) that directly drives the 50 Ω load through an integrated balun. Closed loop operation allows to meet the required linearity without using pre-distortion for a modulated signal of up to 3 dBm power. Measured results shows a RF bandwidth of 50 MHz. The dc power consumption at 1.8 V of supply is around 57.6 mW, resulting in an efficiency of 3.7% (Pout 3 dBm). The ACLR is -40 dBc, while the CIM3 is -49 dBc. The noise at 80 MHz offset from the carrier is -153.5 dBc/Hz.
机译：用于低于6 GHz的5G通信的新无线电接口需要支持带宽高达100 MHz的信道。在提出的发射机中，位于无源基带级之后的无源混频器在当前域中执行I和Q信号的上变频和直接重组。这是在闭环RF跨阻放大器（TIA）的虚拟地上完成的，该放大器通过集成的巴伦直接驱动50Ω负载。闭环操作允许满足所需的线性度，而无需对高达3 dBm功率的调制信号使用预失真。测量结果显示RF带宽为50 MHz。电源电压为1.8 V时的直流功耗约为57.6 mW，效率为3.7％（Pout 3 dBm）。 ACLR为-40 dBc，而CIM3为-49 dBc。从载波偏移80 MHz时的噪声为-153.5 dBc / Hz。

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