Development of Broadband Power Amplifiers
Date Issued
2007
Date
2007
Author(s)
Yeh, Wei-Chih
DOI
en-US
Abstract
According to some researches, no matter in the time domain or in the spatial domain, that the usage of spectrum with utilization ranging from 15% to 85% in the bands below 3 GHz. At frequency above 3 GHz the actual utilization is dramatically lower. The FCC has issued the Cognitive Radio System, this system can improve the utilization of spectrum without interfere with the users who have primary rights to use the spectrum by sensing and changing the transmitted band. In order to transmit signal in multiple frequency bands, there should be a broadband power amplifier in transmitter to adapt to this system.
Circuit design and theory of RF power amplifier are the main research points of this thesis. We analyze some kinds of broadband power amplifier technique and finally we decided to design broadband power amplifier with network synthesis broadband matching.
We use WIN GaAs PHEMT 0.15μm process to design broadband power amplifier. We cascade two common source amplifiers, and all matching networks are integrated into single chip. Operation frequency of this power amplifier is from 3GHz to 7.5GHz, power gain is from 19.6dB to 21.6dB, output P1dB is from 21.5dBm to 22.9dBm and PAE is from 19.5% to 29.5%.
Subjects
功率放大器
寬頻
網路合成
power amplifier
broadband
network synthesis
Type
thesis
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