Radio frequency circuits for wireless receiver front-ends

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Title: Radio frequency circuits for wireless receiver front-ends
Author: Xin, Chunyu
Abstract: The beginning of the 21st century sees great development and demands on wireless communication technologies . Wireless technologies , either based on a cable replacement or on a networked environment , penetrate our daily life more rapidly than ever . Low operational power , low cost , small form factor , and function diversity are the crucial requirements for a successful wireless product . The receiver ? ?s front -end circuits play an important role in faithfully recovering the information transmitted through the wireless channel . Bluetooth is a short -range cable replacement wireless technology . A Bluetooth receiver architecture was proposed and designed using a pure CMOS process . The front -end of the receiver consists of a low noise ampli & #64257 ;er (LNA ) and mixer . The intermediate frequency was chosen to be 2MHz to save battery power and alleviate the low frequency noise problem . A conventional LNA architecture was used for reliability . The mixer is a modi & #64257 ;ed Gilbert -cell using the current bleeding technique to further reduce the low frequency noise . The front -end draws 10 mA current from a 3 V power supply , has a 8 .5 dB noise & #64257 ;gure , and a voltage gain of 25 dB and -9 dBm IIP3 . A front -end for dual -mode receiver is also designed to explore the capability of a multi -standard application . The two standards are IEEE 802 .11b and Bluetooth . They work together making the wireless experience more exciting . The front -end is designed using BiCMOS technology and incorporating a direct conversion receiver architecture . A number of circuit techniques are used in the front -end design to achieve optimal results . It consumes 13 .6 mA from a 2 .5 V power supply with a 5 .5 dB noise & #64257 ;gure , 33 dB voltage gain and -13 dBm IIP3 . Besides the system level contributions , intensive studies were carried out on the development of quality LNA circuits . Based on the multi -gated LNA structure , a CMOS LNA structure using bipolar transistors to provide linearization is proposed . This LNA con & #64257 ;guration can achieve comparable linearity to its CMOS multi -gated counterpart and work at a higher frequency with less power consumption . A LNA using an on -chip transformer source degeneration is proposed to realize input impedance matching . The possibility of a dual -band cellular application is studied . Finally , a study on ultra -wide band (UWB ) LNA implementation is performed to explore the possibility and capability of CMOS technology on the latest UWB standard for multimedia applications .
URI: http : / /hdl .handle .net /1969 .1 /2757
Date: 2005-11-01


Radio frequency circuits for wireless receiver front-ends. Available electronically from http : / /hdl .handle .net /1969 .1 /2757 .

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