Equalization of IM3 Products in Wideband DirectConversion Receivers

📋 论文概要

该论文提出一种均衡技术，用于消除宽带直接变频接收机中的三阶互调（IM3）产物，从而放宽对接收机线性度的要求，并消除对级间SAW滤波器的依赖。通过模拟或数字均衡来抵消IM3失真，实现无SAW滤波器的接收机架构。

💡 主要创新点

• 首次提出利用均衡技术而非传统提高IIP3的方法来消除IM3产物，降低了对前端线性度的苛刻要求。
• 实现了宽带直接变频接收机中IM3失真的自适应或固定均衡，可能结合校准技术以覆盖工艺、电压和温度变化。

🏷 关键词

📄 原文摘要

As scaling reduces the breakdown voltage of CMOS devices and as system integration trends demand the further elimination of offchip components, there arises a great need to improve the linearity of RF receivers. Of particular interest is the direct-conversion architecture, which is currently the workhorse of the mobile telecommunications industry. Although much work has been recently reported in improving the IIP2 of these receivers, the IIP3 requirements still necessitate the use of an inter-stage SAW filter in many applications. In order to remove the SAW filter and to reduce the linearity requirements of the receiver circuitry, in this paper, an alternate path (AP) in parallel with the main path (MP) is introduced (Fig. 10.3.1). The AP generates IM3 products in the analog domain and downconverts them to baseband (BB) using the same LO signal as the MP. The IM3 products are then digitized and used as inputs to

👥 作者与机构

Edward Keehr, Ali Hajimiri

California Institute of Technology, Pasadena, CA