Title :
A Linearity-Enhanced Compact Series-Type Doherty Amplifier Suitable for CDMA Handset Applications
Author :
Koo, Chanhoe ; Kim, Unha ; Jeon, Jooyoung ; Kim, Junghyun ; Kwon, Youngwoo
Author_Institution :
Sch. of Electr. Eng., Seoul Nat. Univ.
Abstract :
A high-linearity series-type Doherty amplifier that does not use bulky 3 dB quadrature hybrid coupler is developed for mobile handset applications. A predistorter is employed at the input to improve the ACPR performance at the high-power region, which effectively extends maximum linear power range. For size and stability considerations, the phasing circuits between the carrier and peak amplifiers have been realized using high-pass T-networks. The series-type Doherty amplifier of this work shows PAE´s of 18% and 42.8% at 16 dBm and 28 dBm, while meeting the IS-95A ACPR requirement of -42 dBc
Keywords :
code division multiple access; mobile handsets; power amplifiers; CDMA handset applications; IS-95A ACPR requirement; high-pass T-networks; linearity-enhanced compact series-type Doherty amplifier; maximum linear power range; mobile handset applications; peak amplifiers; phasing circuits; quadrature hybrid coupler; Circuits; High power amplifiers; Impedance; Linearity; Mobile handsets; Multiaccess communication; Operational amplifiers; Power amplifiers; Power generation; Telephone sets; CDMA; Doherty Amplifier; Linearity; Miniaturization; PAE; Predistorter;
Conference_Titel :
Radio and Wireless Symposium, 2007 IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
1-4244-0445-2
Electronic_ISBN :
1-4244-0445-2
DOI :
10.1109/RWS.2007.351832
