, V m 3,, I p R 1 = ( I p + I 1 ) / R 0 I p, R 1 / 4, R m V d, 1. 1 Doherty MRF6P21190 LDMOS,,, Doherty B Freescale M6P21190 ADS 2 Doherty 3 Doherty,
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1 TN702 A (2007) Doherty, (, ) Doherty WCDMA ADS, 35 (45. 4dBm), ACLR - 55dBc WCDMA ; ; Doherty ; ; PAE Design of linearized Doherty power amplifier GENG Zhi, GUO Wei (Department of Electronic and Information Engineering,Central China University of Science and Technology, Wuhan ,China) Abstract A design of linearized WCDMA power amplifier is introduced in this paper, combining RF DPD and Doherty techniques. By the help of computer aided design and ADS software simulation, it presents that when power amplifier outputs 35W, ACLR has reached - 55 dbcs. Key words WCDMA ; RFDPD (radio frequency digital predistortion) ; Doherty ; ACLR ; PAE 0 WCDMA QPSK 3. 84MHz ( PAR), WCDMA, WCDMA, Freescale MRF6P21190, Doherty 35 WCDMA ADS 35, Doherty, 2 ACLR - 55dBc,PAE 27 %, 2 A 1 Doherty Doherty 6dB 1, 5dB,, AB ; I p, C,, 1 Doherty, ( ),, 45
2 , V m 3,, I p R 1 = ( I p + I 1 ) / R 0 I p, R 1 / 4, R m V d, 1. 1 Doherty MRF6P21190 LDMOS,,, Doherty B Freescale M6P21190 ADS 2 Doherty 3 Doherty, I - V AB C Z Source Z Load,, 25 / 4, 25 / 4, MRF6P21190 Doherty 4 4 Doherty 1. 2 MRF6P21190 Doherty PAE, PAE = ( P in - Doherty P out ) / P drain,, WCDMA 8 %, Doherty 20 % dBm PAE, 30 % ACLR, 46
3 35, (ACLR) WCDMA, 6,, MRF6P21190 Doherty 45. 4dBm, + 5MHz ACLR dBc ; - 5MHz ACLR dBc 3GPP ACLR 45 5MHz, 5 PAE Pout 6 Doherty 35 2, AM - PM LDMOS phase ( V drain out / V in ) = phase ( a 1 + a 2 V in +, a 3 V 2 in + a 4 V 3 in + a 5 V 4 n- in + + a n V 1 in ) V drain out V in V drain out = a 1 V in + a 2 V in + a 3 V in + a 4 V in + AM - AM a 5 V 5 n in + + a n V in, V drain out,, V in a x AM - PM G v = a 1 + a 2 V in + a 3 V 2 in + a 4 V 3 in + a 5 V in 4 a 3 V in 2 + a 4 V in 3 + a 5 V in a n V in n- 1 ) dB, n- + + a n V 1 in,, AM - AM AM - PM mag( V drain out / V in ) = mag( a 1 + a 2 V in
4 ,,LDMOS 10 AM - PM 7 AM - AM 11 V p = F( V i ) V i 8 AM - PM V o = G( V p ) V p K = V o / V i = G( V i F( V i ) ) F( V I ) ( F) = - ( G),, V i,v p,v o, F( V x ), G( V x ) K, K AM - AM, AM - PM AM - AM ,, 13 Agilent HSMS282K 10dB AMΠAM,AMΠPM ; 11 AMΠAM,AMΠ PM, 48
5 14 V EV- out = V in b 1 b ,, AMΠ AM,AMΠPM,, 15, AMΠAM,AMΠPM ;,AΠD,, DΠA,, 3dB,90 AMΠAM 3dB AMΠPM,, 90 AMΠAM AMΠPM,, AMΠAM AMΠPM,, AΠD,, 7dB, 20,, 16, 16, AMΠAM,AMΠPM FPGA 49
6 FPGA Y ( n) = X ( n) pdc ( n) + X ( n) pdm( n) [ p ( n + 1) - p ( n - 1) ] Y ( n) = X ( n) {pdc ( n) + pdm( n) [ p ( n + 1) - p ( n - 1) ]} pdc ( n), AMΠAM AMΠPM ;pdm( n), ; X ( n) ; p ( n) 3, MRF6P21190, Doherty, Doherty ADS2004 behavioral model, Doherty P2D (1) Doherty,, 17 (2) 17, 45. 4dBm, 15. 5dB, + 5MHz ACLR dBc ; - 5MHz ACLR dBc, 45. 4dBm(35 ), + 5MHz ACLR 54. 6dBc ; - 5MHzACLR 54. 4dBc ACLR 15dBc, 3GPP, 27 % WCDMA, Doherty,, FPGA (3), [1 ] Oualid Hammi, Sami Bousnina, Fadhel M Ghannouchi. A Linearized Doherty Amplifier Using Complex Base band Digital Predistortion Dri2 ven by CDMA Signals[J ]. IEEE,2004. [2 ] Doherty W H. A new high efficiency power amplifier for modulated waves[j ]. Proc. IRE, 1936,24 (9) [3 ] HYEONG TAE J EONG, CHUL DONG KIM, IK SOO CHANG. A Novel Power Combining Network for Doherty Amplifiers [J ]. Sogang University Seoul, Korea. Microwave Journal from the July 2004 issue. [4 ] FRANK ZAVOSH, MIKE THOMAS. Motorola Semiconductor Product Sector. Digital Predistortion Techniques for RF Power Microwave Jour2 nal Amplifiers with CDMA Applications[J ]. Microwave Journal. [5 ] Ichiyoshi O. High - Power Linear Amplification Using Periodically Up2 dated Amplitude and Phase Correction Values[ P]. U. S. Patent No. 5,699,383, December 16, [6 ] Zavosh F, et al. Digital Predistortion Techniques for RF Power Ampli2 fiers with CDMA Applications[J ]. Microwave Journal, October [7 ] Joel Vuolevi, Timo Rahkonen. Distortion in RF Power Amplifiers[J ]. ARTECH HOUSE, INC,2003.
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