A wide-band 20W LMOS Doherty power amplifier

Author

Qureshi, J.H. ; Li, N. ; Neo, W.C.E. ; van Rijs, F. ; Blednov, I. ; de Vreede, Leo C. N.

Author_Institution

Dimes, Delft Univ. of Technol., Delft, Netherlands

fYear

2010

fDate

23-28 May 2010

Firstpage

1504

Lastpage

1507

Abstract

This work discusses the efficiency bandwidth constrains in Doherty amplifiers. An analysis of the bandwidth limitations imposed by the impedance inverter and output capacitance of the active devices is given. Alternative wideband matching and output connection schemes for Doherty amplifiers are evaluated for their efficiency performance both at full output power, as well as, in power back-off operation. The presented theory is verified using a Doherty demonstrator amplifier, which allows independent control of the input signals for the main and peak device. The related measurements show the largest high-efficiency bandwidth reported up to date for a Doherty amplifier.

Keywords

MOSFET circuits; impedance convertors; power amplifiers; wideband amplifiers; alternative wideband matching; efficiency performance; high-efficiency bandwidth; impedance inverter; output connection schemes; power 20 W; power back-off operation; wideband LMOS Doherty power amplifier; Bandwidth; Broadband amplifiers; Capacitance; Costs; Frequency; Impedance; Inverters; Operational amplifiers; Power amplifiers; Radiofrequency amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International

Conference_Location

Anaheim, CA

ISSN

0149-645X

Print_ISBN

978-1-4244-6056-4

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2010.5517561

Filename

5517561