The design of a mixer-first wideband receiver with RF bandwidth of 260 MHz suitable for 5G applications below 6 GHz is presented. The transimpedance amplifier immediately following the passive mixer is based on a low-power modified regulated cascode with enhanced selectivity, instead of a conventional shunt-feedback architecture. At the mixer output, thanks to a positive feedback capacitance multiplication, a third-order low-pass filtering in the current domain is performed. A simplified non-linear model is used to demonstrate that, thanks to the improved selectivity, linearity close to the band edge is highly improved. Wide bandwidth, high linearity, and low power are thus achieved. Measurements on a 28-nm CMOS chip prototype show alternate channel IIP3, IIP2, and P1 dB of +22, +70, and +3 dBm, respectively. Receiver (RX) noise figure (NF) is 5.5 dB, while power consumption is 21.6 mW (in the signal path) and 7.8 mW/GHz (for local oscillator (LO) generation) with 1.8-/1.2-V supply.

中文翻译：

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具有三阶电流模式滤波 TIA 的 260 MHz RF 带宽 +22 dBm OOB-IIP3 混频器优先接收器的分析和设计


提出了适用于 6 GHz 以下 5G 应用的射频带宽为 260 MHz 的混频器优先宽带接收器的设计。紧随无源混频器之后的跨阻放大器基于具有增强选择性的低功耗改进型稳压共源共栅，而不是传统的并联反馈架构。在混频器输出处，由于正反馈电容倍增，在电流域中执行三阶低通滤波。使用简化的非线性模型来证明，由于选择性的提高，靠近带边缘的线性度得到了极大的改善。从而实现了宽带宽、高线性度和低功耗。 28 nm CMOS 芯片原型上的测量显示交替通道 IIP3、IIP2 和 P1 dB 分别为 +22、+70 和 +3 dBm。接收器 (RX) 噪声系数 (NF) 为 5.5 dB，而功耗为 21.6 mW（在信号路径中）和 7.8 mW/GHz（用于生成本地振荡器 (LO)），电源电压为 1.8 V/1.2 V。