Design strategy of concurrent multi-band Doherty power amplifier

Author

Kalyan, Robin ; Rawat, Karun ; Koul, Shiban Kishan

Author_Institution

Centre for Appl. Res. in Electron., Indian Inst. of Technol., Delhi, Delhi, India

Volume

9

Issue

12

fYear

2015

Firstpage

1313

Lastpage

1322

Abstract

This paper proposes design methodologies of concurrent multi-band Doherty power amplifiers (PAs) based on multi-band impedance inverting networks and multi-band phase offset lines (POLs). Design procedures for implementing such multi-band impedance inverting networks and multi-band POLs at arbitrary frequencies are presented here. For validating the design procedures, tri/quad-band Doherty PAs are designed, fabricated and tested using continuous wave (CW) and modulated signals in discrete mode and concurrent mode. The tri-band Doherty power amplifier (DPA) is implemented at 1600, 1900 and 2200 MHz. CW signal measurement of tri-band DPA shows an efficiency of 46%, 40% and 42%, respectively, around 6 dB output power back-off (OPBO). The quad-band DPA is implemented at 1600, 1960, 2140 and 2350 MHz. Measured results using CW signal shows an efficiency of 40%, 37%, 30% and 31%, respectively, around 6 dB OPBO.

Keywords

UHF power amplifiers; CW signals; DPA; OPBO; POLs; concurrent mode; concurrent multiband Doherty power amplifier design strategy; continuous wave signals; discrete mode; efficiency 31 percent to 46 percent; frequency 1600 MHz to 2350 MHz; modulated signals; multiband impedance inverting networks; multiband phase offset lines; output power back-off; quad-band Doherty PAs; tri-band Doherty PAs;

fLanguage

English

Journal_Title

Microwaves, Antennas & Propagation, IET

Publisher

iet

ISSN

1751-8725

Type

jour

DOI

10.1049/iet-map.2015.0033

Filename

7244291