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Design of Highly Efficient Load Modulation Transmitter for Wideband Cellular Applications

Hossein Mashad Nemati (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum) ; Haiying Cao (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum) ; Christian Fager (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum) ; Thomas Eriksson (Institutionen för signaler och system, Kommunikationssystem ; GigaHertz Centrum)
IEEE Microwave Theory and Techniques (0018-9480). Vol. 58 (2010), 11, p. 2820-2828.
[Artikel, refereegranskad vetenskaplig]

In this paper, the high potential of varactor-based dynamic load modulation (DLM) techniques for wideband cellular applications is demonstrated. A systematic design procedure is proposed to ensure high-efficiency wideband performance. It incorporates harmonically tuned power amplifier (PA) concepts and tunable matching techniques in an integrated design. A DLM transmitter at 2.65 GHz with a peak output power of 6 W is designed using the proposed procedure. In order to investigate the wideband performance of the implemented demonstrator, WCDMA signals with scaled bandwidths are employed. The signal peak-to-average ratio is 7 dB and the same for all the experiments. For the 38.4-MHz signal, which has a corresponding channel bandwidth of > 40 MHz, an average power added-efficiency (PAE) of 44%, normalized mean square error (NMSE) of -35 dB, and adjacent channel leakage ratio (ACLR) of -43 dBc are measured.

Nyckelord: Digital predistortion (DPD); efficiency; 4G; GaN HEMT; LDMOS FET; linearization; load modulation; LTE; power amplifier (PA)



Denna post skapades 2010-11-15. Senast ändrad 2016-08-16.
CPL Pubid: 129076

 

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