Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/624286
Title: A Broadband High-Efficiency Doherty Power Amplifier With Integrated Compensating Reactance
Authors: Jing Xia;Mengsu Yang;Yan Guo;Anding Zhu
subject: Broadband|power amplifiers (PAs)|integrated compensating reactance (CR)|Doherty|high efficiency|digital linearization
Year: 2016
Publisher: IEEE
Abstract: This paper presents a high-efficiency gallium nitride Doherty power amplifier (DPA) using an integrated compensating reactance (CR) for broadband operation. With an additional quarter-wavelength transmission line integrated in the peaking amplifier output, a CR is generated to compensate the load impedance of the carrier amplifier in the low-power region and thus enhance the back-off efficiency over a wide frequency range without affecting the Doherty load modulation at saturation. For this purpose, a peaking output matching network (OMN) is employed to convert the output impedance of the peaking device into quasi-short circuit when it is off and achieve proper impedance matching when it is on. A two-point matching technique using the transmission (ABCD) matrix is employed to design such desired OMN. Measurement results show that the DPA has a 6-dB back-off efficiency of 50%-55% and a saturated efficiency of 57%-71% over the frequency band of 1.7-2.8 GHz (49% fractional bandwidth). When driven by a 20-MHz long term evolution modulated signal at 6.5-dB back-off power, the DPA can achieve an average efficiency of more than 50% with high linearity after linearization over the design frequency band.
URI: http://localhost/handle/Hannan/160693
http://localhost/handle/Hannan/624286
ISSN: 0018-9480
1557-9670
volume: 64
issue: 7
Appears in Collections:2016

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Title: A Broadband High-Efficiency Doherty Power Amplifier With Integrated Compensating Reactance
Authors: Jing Xia;Mengsu Yang;Yan Guo;Anding Zhu
subject: Broadband|power amplifiers (PAs)|integrated compensating reactance (CR)|Doherty|high efficiency|digital linearization
Year: 2016
Publisher: IEEE
Abstract: This paper presents a high-efficiency gallium nitride Doherty power amplifier (DPA) using an integrated compensating reactance (CR) for broadband operation. With an additional quarter-wavelength transmission line integrated in the peaking amplifier output, a CR is generated to compensate the load impedance of the carrier amplifier in the low-power region and thus enhance the back-off efficiency over a wide frequency range without affecting the Doherty load modulation at saturation. For this purpose, a peaking output matching network (OMN) is employed to convert the output impedance of the peaking device into quasi-short circuit when it is off and achieve proper impedance matching when it is on. A two-point matching technique using the transmission (ABCD) matrix is employed to design such desired OMN. Measurement results show that the DPA has a 6-dB back-off efficiency of 50%-55% and a saturated efficiency of 57%-71% over the frequency band of 1.7-2.8 GHz (49% fractional bandwidth). When driven by a 20-MHz long term evolution modulated signal at 6.5-dB back-off power, the DPA can achieve an average efficiency of more than 50% with high linearity after linearization over the design frequency band.
URI: http://localhost/handle/Hannan/160693
http://localhost/handle/Hannan/624286
ISSN: 0018-9480
1557-9670
volume: 64
issue: 7
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7488227.pdf5.03 MBAdobe PDFThumbnail
Preview File
Title: A Broadband High-Efficiency Doherty Power Amplifier With Integrated Compensating Reactance
Authors: Jing Xia;Mengsu Yang;Yan Guo;Anding Zhu
subject: Broadband|power amplifiers (PAs)|integrated compensating reactance (CR)|Doherty|high efficiency|digital linearization
Year: 2016
Publisher: IEEE
Abstract: This paper presents a high-efficiency gallium nitride Doherty power amplifier (DPA) using an integrated compensating reactance (CR) for broadband operation. With an additional quarter-wavelength transmission line integrated in the peaking amplifier output, a CR is generated to compensate the load impedance of the carrier amplifier in the low-power region and thus enhance the back-off efficiency over a wide frequency range without affecting the Doherty load modulation at saturation. For this purpose, a peaking output matching network (OMN) is employed to convert the output impedance of the peaking device into quasi-short circuit when it is off and achieve proper impedance matching when it is on. A two-point matching technique using the transmission (ABCD) matrix is employed to design such desired OMN. Measurement results show that the DPA has a 6-dB back-off efficiency of 50%-55% and a saturated efficiency of 57%-71% over the frequency band of 1.7-2.8 GHz (49% fractional bandwidth). When driven by a 20-MHz long term evolution modulated signal at 6.5-dB back-off power, the DPA can achieve an average efficiency of more than 50% with high linearity after linearization over the design frequency band.
URI: http://localhost/handle/Hannan/160693
http://localhost/handle/Hannan/624286
ISSN: 0018-9480
1557-9670
volume: 64
issue: 7
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7488227.pdf5.03 MBAdobe PDFThumbnail
Preview File