具干擾偵測功能之WiMAX射頻前端接收器設計

Abstract

本論文主要討論應用於WiMAX系統之具干擾偵測功能射頻前端接收器設計。本文提出一個干擾偵測的機制，可應用於偵測干擾訊號的大小相對於系統想要的訊號。同時也提出具有可控制的雙模線性度(高線性度: 高耗電 ; 低線性度: 低耗電)的射頻前端接收器。將上述電路整合，可在環境干擾大於某個程度時，干擾偵測機制可控制射頻前端接收器於高線性度模式; 反之，則控制於低線度模式。高線性度模式比低線性度模性在射頻接收器的系統模擬上，多增加了5.5dB的干擾容忍值。此系統架構電路是以 0.18 微米 CMOS製程實現。

In this paper, an interference aware scheme is proposed with RF receiver front-end design for WiMAX application. The interference level can be sensed via the proposed scheme for the adjustment of RF front-end linearity performance which corresponds to the system interference tolerance hence avoids unnecessary power consumption. A RF receiver front-end including a low noise amplifier and a mixer with dual modes of high linearity and low linearity are applied to demonstrate the proposed interference aware scheme for WiMAX application. By applying the proposed interference aware scheme with dual modes RF front-end, 5.5dB improvement of system interference tolerance can be achieved. These circuits are fabricated in 0.18um CMOS process.