The Wireless-Receiver-LSI Design Technique for Suppressing Adjacent Channel Interference Signal using Chanel-Grouping Method

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420317
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electron device/Electronic equipment
• Research Institution: Nippon Institute of Technology
• Principal Investigator: UGAJIN Mamoru 日本工業大学, 工学部, 教授 (90506164)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 無線受信回路 / イメージ妨害信号 / 多位相アナログ信号 / 電子回路

Outline of Final Research Achievements

A high-image-rejection wireless receiver with an N-phase active RC complex filter is proposed and analyzed. Signal analysis shows that the double-conversion receiver with (N+N*N) mixers corrects the gain and phase mismatches of the adjacent image. Monte Carlo simulations evaluate the relation between image-rejection performances and the dispersions of device parameters for the double-conversion wireless receiver. The simulations show that the image rejection ratio of the adjacent image depends almost only on R and C mismatches in the complex filter.
For controlling the pass-band of a 3-phase active complex filter, switched capacitor architectures were analyzed. Then two types of circuits were devised and designed. Modified 3-phase mixers for canceling folding noises by even-order distortions were devised and analyzed. In principle, 3-phase signal processing could eliminate the folding noise by the 3-order distortion, thus the degradation of the mixer noise figure were reduced by 2 dB.

Free Research Field

工学