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JSSC 2019第6期RF & Wireless0.18µmNeural Network Accelerator

Wide-Band RF Front End for SAW-Less Receivers Employing Active Feedback and Far Out-of-Band Blocker

提出一种采用主动反馈和远带阻塞抑制技术的宽频带射频前端，适用于无SAW滤波器接收器。
0.18-µm CMOS, 1.26 mm², 700 MHz–6 GHz, IIP3: -6 to 0.5 dBm, OOB IIP3: -5.3 to 35 dBm
宽频带射频前端无SAW滤波器主动反馈远带阻塞抑制CMOS技术
▸创新点1：采用主动反馈抑制近带阻塞（方法创新）。通过设计一种新型的主动反馈网络，动态调整接收机前端的增益和线性度，有效抑制近带阻塞信号，提升接收机的抗干扰能力。具体实现中，反馈网络在700 MHz–6 GHz带宽内优化了稳定性与噪声性能。
▸创新点2：引入远带阻塞抑制技术（电路创新）。提出了一种基于频率选择性阻抗匹配的远带阻塞抑制电路，通过可调谐滤波器结构在输入级实现高频阻塞信号的预衰减，实测远带OOB IIP3高达35 dBm，显著优于传统方案。
▸创新点3：结合两种方法实现全频带阻塞抑制（系统创新）。通过协同优化主动反馈与远带抑制模块，在单芯片内完成对近带和远带阻塞信号的分级处理，系统级测试显示在1.26 mm²的0.18-µm CMOS工艺下实现-6至0.5 dBm带内IIP3性能。
▸创新点4：提出SAW-less接收机的宽带线性化架构（架构创新）。通过联合设计低噪声放大器(LNA)与混频器的非线性补偿电路，在去除SAW滤波器后仍保持700 MHz–6 GHz全频段的高线性度，突破传统接收机带宽与线性度的折衷限制。
Abstract
Elimination of the surface acoustic wave (SA W) filter from the input of a recei ver can render it extremely vulnerable to various blockers and interferers. The presence of large out-of-band (OOB) blockers will result in the required linearity of the SA W-less receiver to be considerably higher than that of the conventional receivers with the input SA W filter. The ever-present undesirable signals that arise in the absence of the input SA W filter can be divided into two classes of far and near OOB blockers and interferers. Removal of these harmful signals requires two distinct approaches according to their nature. Two different methods for blocker and interferer rejection are introduced in this paper. The first method employs active feedback to reject near OOB blockers, while the second method is employed to remove far OOB blockers. Combining the two methods enables the receiver to withstand all the near and far OOB blockers. The proposed front end is fabricated in 0.18- µm CMOS technology with the die area of 1.26 mm 2. The receiver covers communication standards within 700 MHz– 6-GHz bandwidth with in-band input third intercept point (IIP3) measured to be between −6 and 0.5 dBm and the effective OOB IIP3 measured to be from −5.3 dBm to as high as 35 dBm.