Design of the Bi-direction Modulator and Demodulator with Direct-conversion Architecture and Base-band Bandwidth Analysis
Date Issued
2007
Date
2007
Author(s)
Chang, Wei-Lun
DOI
en-US
Abstract
In the last new years , as the demands of wireless communication system grows rapidly , the bands of microwave frequency had been saturated with various communication applications . To achieve wider spectrum for high-speed and high-capacity transmission , bands of millimeter-wave frequency are the solution of this problem . The advantage of MMW wireless communication systems is wider bandwidth comparing with microwave communication systems . To utilize the spectrum efficiently , many methods of complexly digital modulation is proposed . The more complex modulation , the higher linearity is required , and more various phase of signals are required to accomplish process of modulation . Therefore high-linearity and quadrature-phase modulator and demodulator are the emphasis of this thesis . For high level of integration , high performance and low cost , this chip is fabricated by the complementary oxide semi-conductor(CMOS) 0.13um process . A compact size of direct down-conversion and direct up conversion circuits will be presented in this thesis .
Gigabit wireless communication system is a popular topic recently . Except the use of millimeter-wave spectrums , base-band bandwidth is also an important role for high-speed transmission . In many proposed papers , the base-band bandwidth is limited below 1GHz , but there are still some papers which demonstrates the base-band bandwidth of 1 to 3 GHz . It seems narrower than the unlicensed millimeter-wave bands . The method of extending base-band bandwidth to 6-7GHz or even higher than 10GHz will be demonstrated in this thesis . Therefore the bandwidth of base-band spectrum is improved . Not only data rate of gigabit per second , but also data rate of 10 gigabit per second will be achieved . It is a solution for speed of wireless communication systems .
Subjects
調變器
解調器
混頻器
基頻頻寬
modulator
demodulator
mixer
base-band bandwidth
Type
thesis
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