Title :
High efficiency transmitter using varactor based dynamic load modulation
Author :
Fager, C. ; Cao, H. ; Eriksson, T. ; Jos, R. ; Nemati, H. ; Soltani, A. ; Zirath, H.
Author_Institution :
Depts. of Microtechnol. & Nanosci., Chalmers Univ. of Technol., Gothenburg, Sweden
Abstract :
This paper presents results for a dynamic load modulation transmitter where an existing 1 GHz LDMOS power amplifier is combined with a varactor based tuneable load network to produce a dramatic efficiency improvement for modulated signals. The transmitter is combined with a dedicated linearization method to achieve an average PAE of 53% for a WCDMA signal at 7 dB PAPR. The results demonstrate the potential of dynamic load modulation for future transmitters combining flexibility and high efficiency at a low cost.
Keywords :
power amplifiers; radio transmitters; varactors; LDMOS power amplifier; WCDMA signal; dedicated linearization method; dynamic load modulation transmitter; efficiency 53 percent; frequency 1 GHz; high efficiency transmitter; tuneable load network; varactor based dynamic load modulation; Broadband amplifiers; Costs; Electronic mail; Impedance measurement; Multiaccess communication; Power amplifiers; Power generation; Radio transmitters; Varactors; Voltage; LDMOS; Power amplifiers; efficiency; load modulation; varactors;
Conference_Titel :
RF Front-ends for Software Defined and Cognitive Radio Solutions (IMWS), 2010 IEEE International Microwave Workshop Series on
Conference_Location :
Aveiro
Print_ISBN :
978-1-4244-5751-9
DOI :
10.1109/IMWS.2010.5441006
