A 28-GHz high linearity active up-conversion mixer using 28-nm CMOS is presented in this letter. To enhance the modulated output power level under high-order modulation with IM ₃ improvement in the high IF input power region, the second-order intermodulation (IM ₂ ) signal injection technique is adopted. The positive third-order intermodulation (IM ₃ ) signal is generated by mixing the IM ₂ signal and IF input signal with transistors in the transconductance stage biasing in triode region. Therefore, by combining these opposite IM ₃ signal at the output of transconductance stage, the IM ₃ distortion can be alleviated. Besides, the proposed mixer achieves an IM ₃ distortion improvement in a wide IF power range. The measurement results demonstrate conversion gain (CG) of −6.4 dB and output 1-dB compression point (OP _{1 dB} ) of −2.2 dBm with 19 mW. The two-tone measurement results exhibit 10.2 dBm output third-order intercept point (OIP ₃ ). Furthermore, with the modulation measured results using single-carrier 256-QAM signal, the proposed mixer also exhibits a distinguished output power enhancement when the linearizer turns on. To the best of the author’s knowledge, this design is the first demonstration and implemented of an IM ₂ signal injection technique in millimeter-wave frequency, which also improves the output power level of the high-order modulation measurement.

中文翻译：

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在28nm CMOS技术中使用二次谐波注入技术的28GHz高线性度上变频混频器

这封信介绍了一种使用28 nm CMOS的28 GHz高线性度有源上变频混频器。为了在高中频输入功率区域内提高IM _{3的情况下}提高高阶调制下的调制输出功​​率电平 ，采用了二阶互调（IM ₂ ）信号注入技术。正三阶互调（IM ₃ ）信号是通过将IM ₂信号和IF输入信号与偏置在三极管区域的跨导级中的晶体管混合而生成的 。因此，通过在跨导级的输出处组合这些相反的IM ₃信号，可以减轻IM ₃失真。此外，拟议的混音器实现了IM ₃在较宽的中频功率范围内改善失真。测量结果表明 ，在19 mW的条件下，转换增益（CG）为-6.4 dB，输出1 dB压缩点（OP _{1 dB}）为-2.2 dBm。两音调测量结果显示出10.2 dBm输出三阶交调点（OIP ₃ ）。此外，利用使用单载波256-QAM信号的调制测量结果，当线性化器开启时，所提出的混频器还表现出显着的输出功率增强。据作者所知，该设计是毫米波频率的IM ₂信号注入技术的首次演示和实现 ，它还提高了高阶调制测量的输出功率水平。