A 94GHz 3D-Image Radar Engine with 4TX/4RX Beamforming Scan Technique in 65nm CMOS 88 to 96GHz with less than 1dB degradation. The fundamental and 2nd-order rejections are greater than 35 and 25dB, respectively.

📋 论文概要

本文提出了一种94GHz 3D图像雷达引擎，采用4TX/4RX波束成形扫描技术，工作频率为88-96GHz且退化小于1dB。通过两步相位插值实现了7位相移器，解决了毫米波成像雷达的高精度波束控制问题。

💡 主要创新点

• 提出了一种两步相位插值的7位相移器，通过粗调和细调两个步骤实现高分辨率相位合成。
• 实现了94GHz 3D图像雷达引擎，集成了4TX/4RX波束成形扫描，工作带宽覆盖88-96GHz且性能退化小于1dB。

🏷 关键词

📄 原文摘要

Figure 8.6.4(a) depicts the 94GHz 7-bit phase shifter with two-step phase interpolation. The vector generator consists of a 90° coupler and 2 baluns, converting RF input into differential quadrature signals. The desired phase can be synthesized by properly adjusting the amplitude of quadrature signals. In the first step, the differential quadrature signals are parallelized into two coarse phase selectors. Each is driven by a DAC with 3 current sources, allowing 16 phase states with resolution of 22.5°. In the second step, a fine phase selector driven by a DAC with 5 current sources synthesizes another 3-bit fine phase state. The logic encoder is utilized with static CMOS gates such that the phase shifter can be controlled by 7-bit binary codes. The corresponding phase resolution is 360°/27≈2.8°. Using the two-step phase interpolation technique, the current DAC design can be much more relaxed. This is in contrast to the traditional one-step

👥 作者与机构

Pang-Ning Chen, Pen-Jui Peng, Chiro Kao, Yu-Lun Chen, Jri Lee