TY - GEN
T1 - Doherty power amplifier using a compact load network for bandwidth extension
AU - Seo, Mincheol
AU - Lee, Hwiseob
AU - Gu, Jehyeon
AU - Yang, Youngoo
PY - 2013
Y1 - 2013
N2 - This paper presents a Doherty power amplifier (DPA) with a compact load network for an extended bandwidth compared to the conventional DPA. The compact load network takes less area since it has just one load matching network after the quarter-wave transmission line and no offset-lines. For the verification, both conventional and compact DPA's are designed and built using GaN HEMT for the band from 650 to 800 MHz. They were evaluated using the down-link 16-QAM FDD LTE signal that has a PAPR of 9.96 dB and a signal bandwidth of 5 MHz. At an average output power of 34 dBm, which is approximately 9 dB back-off from the 1 dB compression point, the proposed compact DPA exhibited a power-added efficiency (PAE) level of more than 40 % and an adjacent channel leakage power ratio (ACLR) level of lower than -25 dBc over the frequency band of from 650 to 800 MHz, while the conventional DPA showed a PAE level of more than 26.6 % and an ACLR level lower than -23 dBc. In addition, the proposed compact DPA has a reduced circuit size by 40.9 % compared to the conventional one.
AB - This paper presents a Doherty power amplifier (DPA) with a compact load network for an extended bandwidth compared to the conventional DPA. The compact load network takes less area since it has just one load matching network after the quarter-wave transmission line and no offset-lines. For the verification, both conventional and compact DPA's are designed and built using GaN HEMT for the band from 650 to 800 MHz. They were evaluated using the down-link 16-QAM FDD LTE signal that has a PAPR of 9.96 dB and a signal bandwidth of 5 MHz. At an average output power of 34 dBm, which is approximately 9 dB back-off from the 1 dB compression point, the proposed compact DPA exhibited a power-added efficiency (PAE) level of more than 40 % and an adjacent channel leakage power ratio (ACLR) level of lower than -25 dBc over the frequency band of from 650 to 800 MHz, while the conventional DPA showed a PAE level of more than 26.6 % and an ACLR level lower than -23 dBc. In addition, the proposed compact DPA has a reduced circuit size by 40.9 % compared to the conventional one.
KW - compact load network
KW - Doherty power amplifier
KW - DPA
KW - no offset-line
KW - Power amplifier
UR - https://www.scopus.com/pages/publications/84893398809
U2 - 10.1109/APMC.2013.6694916
DO - 10.1109/APMC.2013.6694916
M3 - Conference contribution
AN - SCOPUS:84893398809
SN - 9781479914746
T3 - Asia-Pacific Microwave Conference Proceedings, APMC
SP - 742
EP - 744
BT - 2013 Asia-Pacific Microwave Conference Proceedings, APMC 2013
T2 - 2013 3rd Asia-Pacific Microwave Conference, APMC 2013
Y2 - 5 November 2013 through 8 November 2013
ER -