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Title: A Digitally Assisted Dual-Input Dual-Band Doherty Power Amplifier with Enhanced Efficiency and Linearity
Authors: Kalyan R.
Rawat, Karun
Koul S.K.
Published in: IEEE Transactions on Circuits and Systems II: Express Briefs
Abstract: This brief presents a dual-input dual-band Doherty power amplifier (DPA) that operates at 850 and 2100 MHz. The presented DPA utilizes a compact input matching network and composite right-left handed phase offset line. This DPA delivers a peak output power of around 44.5 dBm with an efficiency enhancement region upto 9-10 dB output power back off at both the operating frequencies. Further, the phase offset angles between main and auxiliary power amplifiers are controlled digitally at both the operating frequencies in order to improve the efficiency and linearity throughout the back-off region. As compared to the conventional phase offset of 90°, the optimum offset angle of 120° at 850 MHz provides an improvement of 13% in drain efficiency and 8.5 dB in C/IMD3. Similarly, an improvement of 4 dB in C/IMD3 is achieved by digitally setting a phase offset of 80° at 2100 MHz. © 2004-2012 IEEE.
Citation: IEEE Transactions on Circuits and Systems II: Express Briefs (2019), 66(2): 297-301
Issue Date: 2019
Publisher: Institute of Electrical and Electronics Engineers Inc.
Keywords: Digital splitting
Doherty power amplifier
efficiency and linearity enhancement
out phasing
ISSN: 15497747
Author Scopus IDs: 56005046600
Author Affiliations: Kalyan, R., Indian Institute of Technology Delhi, New Delhi, 110016, India
Rawat, K., Indian Institute of Technology Roorkee, Roorkee, 247667, India
Koul, S.K., Indian Institute of Technology Delhi, New Delhi, 110016, India
Funding Details: Manuscript received April 15, 2018; revised June 23, 2018; accepted July 21, 2018. Date of publication July 24, 2018; date of current version January 29, 2019. This work was supported by the Department of Science and Technology, Government of India through DST INSPIRE Fellowship and DST under Grant SB/S3/EECE/047/2014. This brief was recommended by Associate Editor C.-T. Cheng. (Corresponding author: Robin Kalyan.) R. Kalyan and S. K. Koul are with the Indian Institute of Technology Delhi, New Delhi 110016, India (e-mail:;
Corresponding Author: Kalyan, R.; Indian Institute of Technology DelhiIndia; email:
Appears in Collections:Journal Publications [ECE]

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