射頻吉伯特混頻器設計與實作

Abstract

本篇論文介紹了各種應用於無線區域網路之射頻吉伯特混頻器。另外，對於單晶片時代的來臨，外差式接收機已不符合時代潮流的需要，因此我們討論了利用複數混頻器及複數濾波器的方法來消除鏡像訊號的干擾的低中頻架構降頻電路。此外，實現了一個採用正交相位的混頻器去除邊頻的單邊頻帶升頻器。 本論文分別以TSMC 0.18μm 1P6M CMOS以及GCT 2μm InGaP/GaAs HBT 製程來研製應用於802.11a WLAN 之 5GHz 頻帶之升降頻混頻器，其中CMOS製程包含了整合電流合成器之升頻微混頻器、單邊頻帶升頻器等電路。由於TSMC 0.18μm 1P6M CMOS 製程的RF Model 已有不錯的準確性以及穩定度，透過小心的設計及佈局，均可得到不錯的5GHz 電路特性。而採用GCT 2μm InGaP/GaAs HBT 製程則包含了整合Rat-Racing Balun 升頻微混頻器、與具鏡像抑制功能的單正交相位降頻器(SQDC)與雙正交相位降頻器(DQDC)等電路。

In this thesis, we introduce some kinds of RF Gilbert mixers for WLAN’s application. For the coming age of system-on-chip, the hetero-dyne receiver doesn’t meet the needs for applications, so we discuss the image rejection methods by using complex mixers and complex filters for Low-IF receiver. Then, we also use the complex method to implement a single-sideband up-conversion mixer. In this thesis, we implement up-conversion and down-conversion mixers for 802.11a WLAN’s applications by using TMSC 0.18μm 1P6M CMOS and GCT 2.0 μm InGaP/GaAs HBT process. In the CMOS process which includes a micro-mixer with the LC current combiner, a single-sideband up-converter etc. Because the RF model of TSMC 0.18μm 1P6M CMOS process has been stable and accurate, we get some measurement results match the ADS’s simulation. And, in the HBT process which includes a micro-mixer with integrated lumped-element rat-racing balun, a single quadrature down converter and a double quadrature down converter circuits.