應用於9-band OFDM 超寬頻系統低電壓接收機之前端射頻積體電路設計

A 3.1-8 GHz Low Supply Voltage Receiver RF Front-end for 9-Band OFDM Ultra-wideband System

潘士安(Shih-An Pan)

指導教授 ： 楊正任

元智大學/電機通訊學院/通訊工程學系/碩士(2009年)

https://doi.org/10.6838/YZU.2009.00165

摘要

此電路將使用1.2V，將低雜訊放大器與混頻器加以結合，而達到低電壓全積體化的前端電路設計。由於超寬頻系統中，單一低雜訊放大器使用較多電感而在整合上會有一定的困難性，也會增加生產成本，故採用current reuse 的架構來做匹配，減少電感的使用而達到全積體化的目的。而混頻器部分使用差動電路，我們採用folded-switching mixer 的架構來達到低電壓設計的目的。而其增益平坦度約在正負0.25dB。由於混頻器是一個差動輸入輸出的架構，而低雜訊放大器是單端輸入輸出，所以在整合上需要一個單端轉差動的電路來達到整合的目的，因此採用一個CG-CS 的架構來達成相位差180 度的差動訊號，由於主動balun 與混頻器有共用的元件，所以也可以減少元件的使用來達到減少晶片面積的目的。

關鍵字

低電壓 ； 接收機:低雜訊放大器:混頻器 ； 增益平坦度

並列摘要

The circuit used the 1.2V power supply. It combines the LNA with the mixer, and it achieves the goal which is the low voltage receiver RF front-end design. Because the LNA used the more inductors, it will be difficult for the combining design for ultra-wideband system. And it will increase the cost of the procreation. To avoid using more inductors, the circuit uses the current reuse structure for all integrated circuit. And the part of the mixer uses the differential circuit and folded-switching mixer for the low voltage supply. The gain flat of the mixer is +/- 0.25dB. Because the folded-switching mixer has the differential input and output, it needs an active balun for combining it with the LNA. The active balun has the capability to the single signal into the differential signal. So the active balun uses the CG-CS structure to do it. Then, the active balun and the folded-switching mixer have the same components. So they can use them together to reduce the chip size.

並列關鍵字

low voltage ； receiver ； LNA ； mixer:gain flat

參考文獻

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