具I/Q自動校正之CMOS IEEE 802.11g收發器

Abstract

本文詳述如何利用Superheterodyne架構，設計符合IEEE 802.11g標準之無線收發器．為了解決高速無線通訊對收發器內I/Q調變器和解調器的增益和相位對稱要求，本收發器提供發送端與接收端I/Q增益和相位自動校正功能．當收發器完成自動校正，I/Q增益差少於0.1dB，I/Q相位差少於1度．收發器電路使用 TSMC 0.25μm 1P5M CMOS製程來實現．電路操作電壓為2.7V，接收端的雜訊指數(noise figure)達到5.1dB，發送端的輪出功率壓縮點(output gain compression point P-1dB)高於7dBm．

The CMOS transceiver IC exploits the superheterodyne architecture to implement a low-cost RF front-end with an auto-I/Q calibration function for IEEE 802.11g. The transceiver supports I/Q gain and phase mismatch auto tuning mechanisms at both the transmitting and receiving ends, which are able to reduce the phase mismatch to within one degree and gain mismatch to 0.1dB. Implemented in a 0.25