Title :
An Integrated Wideband Power Amplifier for Cognitive Radio
Author :
Chen, Yi-Jan Emery ; Yang, Li-Yuan ; Yeh, Wei-Chih
Author_Institution :
Nat. Taiwan Univ., Taipei
Abstract :
This paper presents the development of the wideband power amplifier (PA) for application to intelligent cognitive radios. The load-tracking based on the frequency-varied load-pull technique is proposed for the PA design. The load impedance tracking is realized by filter network synthesis. A 3-7.5-GHz broadband PA is demonstrated in 0.15-mum InGaAs pseudomorphic HEMT technology. Operated at 3.5 V, the P1 dB and power-added efficiency of the PA are better than 21.4 dBm and 20%, respectively.
Keywords :
cognitive radio; network synthesis; power HEMT; power amplifiers; wideband amplifiers; cognitive radio; filter network synthesis; frequency 3 GHz to 7.5 GHz; frequency-varied load-pull technique; integrated wideband power amplifier; load impedance tracking; pseudomorphic HEMT; size 0.15 mum; Broadband amplifiers; Cognitive radio; Filters; Frequency; Impedance; Indium gallium arsenide; Network synthesis; PHEMTs; Power amplifiers; Radiofrequency amplifiers; Cognitive radio (CR); frequency agile; load-tracking; power amplifier (PA); pseudomorphic HEMT (pHEMT); software-defined radio (SDR); wideband;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2007.906497
