Title :
A new "series-type" Doherty amplifier for miniaturization
Author :
Jung, Joomin ; Kim, Unha ; Jeon, Jooyoung ; Kim, Junghyun ; Kang, Kyungteh ; Kwon, Youngwoo
Author_Institution :
Sch. of Electr. Eng., Seoul Nat. Univ., South Korea
Abstract :
A new topology of Doherty amplifier is proposed to reduce the circuit size by eliminating the bulky 3 dB 90° hybrid coupler. Unlike the classical Doherty amplifier, the carrier and peak amplifiers are connected in series together with an impedance-inverting network connecting the outputs of both amplifiers. A simple matching circuit between the peak and carrier amplifier replaces the input hybrid coupler. In this way, the need for an input hybrid coupler is eliminated, facilitating integration and miniaturization. The fabricated 2.45 GHz amplifier module using the proposed topology demonstrates enhanced efficiencies in the low- to mid-power ranges and shows good gain flatness. This approach is promising for highly-integrated Doherty-type amplifiers for handset applications.
Keywords :
MMIC amplifiers; UHF amplifiers; UHF integrated circuits; code division multiple access; integrated circuit design; low-power electronics; mobile handsets; network topology; 2.45 GHz; amplifier integration; amplifier module topology; amplifier outputs; circuit size; gain flatness; handset applications; highly-integrated Doherty-type amplifiers; impedance-inverting network; input hybrid coupler elimination; matching circuit; miniaturization; power ranges; series connected carrier and peak amplifiers; series-type Doherty amplifier topology; Circuit topology; Coupling circuits; High power amplifiers; Impedance; Multiaccess communication; Network topology; Power amplifiers; Power generation; Radiofrequency amplifiers; Transformers;
Conference_Titel :
Radio Frequency integrated Circuits (RFIC) Symposium, 2005. Digest of Papers. 2005 IEEE
Print_ISBN :
0-7803-8983-2
DOI :
10.1109/RFIC.2005.1489777
