论文标题
多相插值数字功率放大器用于TX波束成形
Multiphase interpolating digital power amplifiers for TX beamforming
论文作者
论文摘要
本文介绍了在65nm CMOS中实施的4通道横梁形成的TX。每个波束形成的TX都由C-2C拆分阵列多相开关电容器功率放大器（SAMP-SCPA）组成。这是多相插值（MPI）首次用于发光。该技术非常适合低频波束形成和MIMO，因为它不需要被动或基于LO的相位变速杆。 SCPA非常适合用作核心元素，因为它可以执行频率翻译，数据转换并在紧凑的模具区域中以高功率和效率驱动输出。占用2 mm x 2.5 mm的原型4元素束形式的TX可以达到24.4 dBm的峰值输出功率，峰系统效率（SE）为24％，而实现<1°相分辨率和<1°相分辨率和<1 dB增益误差。当传输15 MHz时，64 QAM长期演化（LTE）信号在14％SE时输出18.4 dbm，相邻通道泄漏比（ACLR）<-30 dBC <-30 dBC和误差矢量幅度（EVM）和3.27％-RMS为1.75 GHz时。基于测量的综合光束图案是由于单个模具的成就<0.32°-RMS束角误差和<0.15 dB RMS梁振幅误差。
This paper presents a 4-channel beamforming TX implemented in 65nm CMOS. Each beamforming TX is comprised of a C-2C split-array multiphase switched-capacitor power amplifier (SAMP-SCPA). This is the first use of multiphase interpolation (MPI) for beam-steering. This technique is ideal for low-frequency beamforming and MIMO, as it does not require passive or LO based phase shifters. The SCPA is ideal to use as the core element since it can perform frequency translation, data conversion and drive an output at high power and efficiency in a compact die area. A prototype 4-element beamforming TX, occupying 2 mm X 2.5 mm, can achieve peak output power of 24.4 dBm with a peak system efficiency (SE) of 24%, while achieving < 1° phase resolution and <1 dB gain error. When transmitting a 15 MHz, 64 QAM long-term evolution (LTE) signal it outputs 18.4 dBm at 14% SE with a measured adjacent channel leakage ratio (ACLR) < -30 dBc and error vector magnitude (EVM) of 3.27 %-rms at 1.75 GHz. A synthesized beam pattern based on measured results from a single die achieves <0.32°-rms beam angle error and <0.15 dB rms beam amplitude error.
