Details

Autor(en) / Beteiligte

• Heung-Jae Choi
• Jong-Sik Lim
• Yong-Chae Jeong
• Chul-Dong Kim

Titel

Doherty Amplifier Using Load Modulation and Phase Compensation DGS Microstrip Line

Ist Teil von

• 2006 European Microwave Conference, 2006, p.352-355

Ort / Verlag

IEEE

Erscheinungsjahr

2006

Quelle

IEEE/IET Electronic Library

Beschreibungen/Notizen

• In this paper, a new Doherty power amplifier having the ideal harmonic termination condition that has been usually ignored is proposed. A defected ground structure (DGS) is adopted on the ground pattern of the output lambda/4 impedance inverter of the carrier amplifier and output offset transmission line of the peaking amplifier that are essential for proper load modulation operation of a conventional Doherty amplifier. As a result of the second and third harmonic termination, excellent improvement in power added efficiency (PAE), gain, maximum output power as well as linearity is obtained. The acquired improvements in gain, maximum output power (P 1dB ), PAE and adjacent channel leakage ratio (ACLR) to WCDMA 2FA signal are 0.42dB, 0.33dB, 12.7%, and 5.1dB, respectively. Moreover, physical length of microstrip line is shortened fairly by DGS, therefore the whole amplifier circuit size is considerably reduced