A 65 nm CMOS Quadrature Balanced Switched-Capacitor Power Amplifier for Full- and Half-Duplex Wireless Operation
A 65 nm CMOS Quadrature Balanced Switched-Capacitor Power Amplifier for Full- and Half-Duplex Wireless Operation
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用于全双工和半双工无线操作的 65 nm CMOS 正交平衡开关电容器功率放大器
DOI：
10.1109/jssc.2021.3101987
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发表时间：
2021
影响因子：
5.4
通讯作者：
E. Cohen
中科院分区：
文献类型：
--
作者：
Nimrod Ginzberg;D. Regev;Rani Keren;E. Cohen
本文提出了一种基于 65 nm CMOS 正交平衡开关电容器功率放大器 (QB-SCPA) 架构的全双工 (FD) 和半双工 (HD) 操作的多模式无线发射器。 QB-SCPA 提供固有的无源发送接收 (TX-RX) 隔离以及嵌入式数字自干扰消除 (SIC) 信号注入机制，并表现出出色的 TX 和 RX 线性特性。为了最大限度地减少 RX 路径的噪声系数下降，两个 SCPA 之间共享本地振荡器 (LO) 信号，其中两个 SCPA 包括发送器和生成 25% 时钟信号的重定时电路，用于在 LNA 端口获得相位噪声抑制。在 FD 模式下，在具有 11 dB 峰值平均功率比 (PAPR) 的 20 MHz 正交频分复用 (OFDM) 信号的瞬时带宽上展示了 50 dB 的 SIC，以及在 SIC ON 且无数字预失真的情况下为 −35 dB TX 误差矢量幅度 (EVM)。该发射机在 HDTX 和 FD 模式下的最大输出功率分别为 23 dBm、26.5% 功率附加效率 (PAE) 和 21 dBm、17.4% PAE，并具有 1.5 至 3 GHz 之间的宽工作带宽。
This article proposes a multi-mode wireless transmitter for full-duplex (FD) and half-duplex (HD) operation based on a quadrature balanced switched-capacitor power amplifier (QB-SCPA) architecture in 65 nm CMOS. The QB-SCPA provides inherent passive transmit–receive (TX–RX) isolation along with an embedded digital self-interference cancellation (SIC) signal injection mechanism and exhibits excellent TX and RX linearity characteristics. To minimize noise figure degradation to the RX path, local oscillator (LO) signal sharing between the two SCPAs comprising the transmitter and a retiming circuit that generates the 25% clock signals is employed to obtain phase noise suppression at the LNA port. In the FD mode, 50 dB of SIC is demonstrated across the instantaneous bandwidth of a 20 MHz orthogonal frequency-division multiplexing (OFDM) signal with 11 dB peak-to-average power ratio (PAPR), along with −35 dB TX error vector magnitude (EVM) with SIC ON and without digital predistortion. The transmitter achieves a maximum output power of 23 dBm with 26.5% power-added efficiency (PAE) and 21 dBm with 17.4% PAE in HDTX and FD modes, respectively, and has a wide operating bandwidth between 1.5 and 3 GHz.