We introduce a transmitter (TX) architecture and a linearization technique for concurrent transmission of two intraband noncontiguous carrier aggregation signals in the 5 GHz frequency band. The technique is based on low-power and narrowband analog signal injection to compensate for out-of-band (OOB) third-order intermodulation distortions (IMD3), together with 2-D digital predistortion to address error vector magnitude (EVM) degradation caused by in-band intermodulation and cross-modulation distortions. The hybrid analog-digital design enables wideband linearization over the entire third-order distortion bandwidth (BW) using practical sampling rate requirements from the digital-to-analog converter (DAC) and analog-to-digital converter (ADC). The system’s performance was evaluated using a class AB power amplifier implemented in the 180 nm CMOS technology and two VHT 802.11ac Wi-Fi signals with a 20 MHz modulation BW. The linearization technique achieves 7–12 dB cancellation of OOB IMD3 products along with 6–9 dB of in-band EVM correction at 8 dBm average output power over a BW of up to 1.2 GHz, with only 60 MHz BW requirement from the DACs and ADCs.

中文翻译：

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使用模拟信号注入和二维数字预失真对载波聚合发射机进行宽带线性化

我们介绍了一种发射机 (TX) 架构和一种线性化技术，用于在 5 GHz 频段中同时传输两个带内非连续载波聚合​​信号。该技术基于低功率和窄带模拟信号注入，以补偿带外 (OOB) 三阶互调失真 (IMD3)，以及二维数字预失真，以解决由通过带内互调和交叉调制失真。混合模数设计使用来自数模转换器 (DAC) 和模数转换器 (ADC) 的实际采样率要求，在整个三阶失真带宽 (BW) 上实现宽带线性化。该系统的性能是使用采用 180 nm CMOS 技术实现的 AB 类功率放大器和两个具有 20 MHz 调制带宽的 VHT 802.11ac Wi-Fi 信号进行评估的。线性化技术在高达 1.2 GHz 的带宽上实现了 7–12 dB 的 OOB IMD3 产品消除以及 6–9 dB 的带内 EVM 校正，在 8 dBm 平均输出功率下，DAC 和ADC。