A 28-GHz CMOS 2×4 Phased Array Chip with High-Precision Phase-Adjusting Function Between Subarrays for Beam Multiplexing

T. Shimura, T. Ohshima, Shohei Ishikawa, Shunsuke Fujio, Kazuyuki Ozaki, H. Ishikawa, Ken-ichi Nishikawa, M. Shimizu, Y. Ohashi
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引用次数: 1

Abstract

We propose a transmitter configuration with a phase-adjusting function between subarrays for beam multiplexing. We demonstrate a 28-GHz CMOS phased array chip with a phase-adjusting function for a beam-multiplexing transmitter. The phased array chip has two subarrays, each having four transmit channels to accurately set output phases and amplitudes via a multi-channel 10-bit-resolution digital-to-analog converter. The phase-setting resolution of the chip is less than 1.0°. The phase array chip also has nine mixers for detecting the phase difference between subarrays in the chip, between channels in the subarray, and between the chip and another chip. The measured root-mean-square (RMS) output phase error and the measured RMS phase-difference detection error of the chip are both 0.7°. Using this chip with a high-precision phase-adjusting function, it is possible to realize a transmitter with a signal-to-interference ratio of over 25 dB for beam multiplexing. We also propose an antenna configuration for two-dimensional beam scanning and horizontal beam multiplexing using the phased array chips.
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一种具有高精度子阵间相位调节功能的28 ghz CMOS 2×4相控阵芯片,用于波束复用
我们提出了一种具有子阵列间相位调节功能的发射机结构,用于波束复用。我们演示了一种用于波束复用发射机的具有相位调节功能的28 ghz CMOS相控阵芯片。相控阵芯片有两个子阵列,每个子阵列有四个传输通道,通过多通道10位分辨率数模转换器精确设置输出相位和幅度。该芯片的相位设定分辨率小于1.0°。相控阵芯片还具有9个混频器,用于检测芯片中的子阵列之间、子阵列中的通道之间以及芯片与另一芯片之间的相位差。测得的芯片输出相位误差均方根(RMS)和测得的芯片相位差检测误差均方根(RMS)均为0.7°。利用该芯片具有高精度相位调节功能,可以实现信号干扰比超过25 dB的波束复用发射机。我们还提出了一种使用相控阵芯片进行二维波束扫描和水平波束复用的天线配置。
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