A Stacking Mixer-First Receiver Achieving >20dBm Adjacent-Channel IIP3 Consuming less than 25mW

📋 论文概要

本文提出了一种堆叠混频器优先接收机，通过创新的堆叠结构实现了大于20dBm的邻道IIP3，同时功耗低于25mW，解决了传统混频器优先接收机噪声性能差的问题。

💡 主要创新点

• 采用堆叠混频器结构，在不增加功耗的前提下显著提升了线性度，实现了>20dBm的邻道IIP3。
• 通过优化接收机架构，在保持低功耗（<25mW）的同时改善了噪声系数，克服了传统混频器优先接收机的噪声瓶颈。

🏷 关键词

📄 原文摘要

The sub-6GHz spectrum is used by many standards including 5G New Radio. In this crowded spectrum, an RX requires good linearity and flexibility to address different bands without separate SAW filters, whilst maintaining low NF. Traditional mixer-first receivers (MF-RX) offer this flexibility while postponing voltage amplification to the end of the RX chain, benefiting linearity but leading to relatively poor NF. LNTA-based designs [1,2] offer an alternative: initial amplification alleviates noise constraints, but the pole at the LNTA output limits the RX operating range, though efforts to reduce parasitic capacitance have been fruitful [2]. Still, linearity is impacted by this initial voltage gain, which is typically addressed by deploying an N-path notch filter in feedback around the LNTA, but its slope is generally limited to 20dB/decade, reflecting in poor adjacent channel IIP3. Although solutions to increase this slope exist, the extra circuitry increases the RF

👥 作者与机构

Stef van Zanten, Ronan van der Zee, Bram Nauta

University of Twente, Enschede, The Netherlands