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
AI总结：
本文提出了一种基于多相插值技术的4通道波束成形TX，实现了高功率、高效率和高精度的波束成形性能。
摘要：
本文介绍了一种在65nm CMOS上实现的4通道波束成形TX。每个波束成形TX由一个C-2C分裂数组多相开关电容功率放大器（SAMP-SCPA）组成。这是首次将多相插值（MPI）用于波束成形。该技术适用于低频波束成形和MIMO，因为它不需要被动或基于本地振荡器的相位移移器。SCPA因其能够进行频率转换、数据转换并在紧凑的芯片面积内以高功率和效率驱动输出而成为理想的核心元件。一个原型4元件波束成形TX，占用2毫米X 2.5毫米的空间，可以达到24.4dBm的峰值输出功率，峰值系统效率（SE）为24%，同时实现小于1度的相位分辨率和小于1dB的增益误差。当传输15MHz、64QAM长期演进（LTE）信号时，它在1.75GHz处输出18.4dBm，系统效率为14%，测量的邻道泄漏比（ACLR）小于-30dBc，误差矢量幅度（EVM）为3.27%-rms。基于单片测量结果合成的波束图案实现了小于0.32度-rms的波束角度误差和小于0.15dB rms的波束幅度误差。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
