Design of Broadband Modified Class-J Doherty Power Amplifier With Specific Second Harmonic Terminations | Zendy

Chaoyi Huang | Zendy; Songbai He | Zendy; Fei You | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Design of Broadband Modified Class-J Doherty Power Amplifier With Specific Second Harmonic Terminations

Author(s) -

Chaoyi Huang,

Songbai He,

Fei You

Publication year - 2018

Publication title -

ieee access

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.587

H-Index - 127

ISSN - 2169-3536

DOI - 10.1109/access.2017.2784094

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

This paper presents a symmetrical Doherty power amplifier (DPA) based on class-J mode for efficiency enhancement in a broad bandwidth. With a second harmonic suppression integrated into the output matching network of carrier power amplifier (PA) and peaking PA, respectively, the complex interaction of varying second harmonic impedances caused by dynamic load modulation can be eliminated and the second harmonic impedance remains the same reactance at both the output back-off (OBO) region and the saturated power. To meet the requirement of second harmonic termination, the DPA works in conventional class-J mode at the saturated power and a modified class-J continuum is proposed to expand the impedance design space at 8 dB OBO with good efficiency performance. A gallium nitride DPA is designed and fabricated to validate the method over a frequency band of 3.3-3.75 GHz. Under a 10%-duty-cycle pulse excitation, experimental results show the DPA delivers 48-48.8 dBm output power with a drain efficiency (DE) of 58%-71%. At 8 dB OBO, a measured DE of 44%-55% is achieved with a gain of 11.8-13.5 dB. When driven by a 2-carrier 40-MHz long-term evolution signal with a peak-to-average power ratio of 8 dB, the DPA exhibits an adjacent channel leakage ratio of -30 dBc at an average output power of 40.7 dBm at 3.45 GHz.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research