JSSC 2012第2期Digital CircuitsNeural Network Accelerator

A Broadband Low-Power Low-Noise Active Balun With Second-Order

本文提出了一种宽带低噪声放大器，利用二阶失真消除技术实现低功耗和低噪声。

230 MHz至470 MHz频段内IIP2为28至34 dBm，噪声系数为2.25 dB至4 dB，功耗7.8 mW

宽带低噪声放大器二阶失真消除线性反馈低功耗

▸创新点1：利用IM2消除技术实现宽带低噪声放大器设计，通过二阶失真抵消显著提高线性度，实测IIP2在反馈启用时达到28-34 dBm，较未启用时提升9-8 dBm。

▸创新点2：线性反馈路径设计创新，将共模输出反馈至单端输入端，有效抑制二阶失真产物，同时保持噪声系数优化（VHF频段NF低至2.25 dB）。

▸创新点3：采用复制偏置技术降低工艺/电压/温度（PVT）敏感性，通过结构冗余确保系统稳定性，功耗仅7.8 mW，实现高鲁棒性低功耗设计。

▸创新点4：融合反馈与噪声优化技术，在保证失真抵消的前提下，使噪声性能优于无反馈架构（UHF频段NF 2-4 dB），突破传统线性度-噪声权衡限制。

Abstract

This paper presents a broadband single-ended input differential output low noise ampliﬁer exploiting IM2 cancelling. A linear feedback from the common mode output to the single-ended input effectively cancels the seco nd-order distortion products in the differential output. The feedback path can be designed for min- imum noise, leading to equal or lower noise compared to the ampli- ﬁer without feedback. A replica bias ensures reduced sensitivity to process, supply voltage and tempe rature variations. The measured IIP2 across the band from 230 MHz to 470 MHz, varies from 19 to 26 dBm when the feedback is disabled and from 28 to 34 dBm when the feedback is enabled. Measured NF is 2.25 dB in the VHF band and between 2 and 4 dB in the UHF band. Power dissipation is 7.8 mW.