A wide-band 20W LDMOS Doherty power amplifier

Author

Qureshi, J.H. ; Nan, Li ; Neo, E. ; Rijs, F.V. ; Blednov, I. ; de Vreede, L.

Author_Institution

Delft Univ. of Technol., Delft, Netherlands

fYear

2010

fDate

23-28 May 2010

Firstpage

1

Lastpage

1

Abstract

Summary form only given. 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

MIS devices; invertors; power amplifiers; wideband amplifiers; Doherty demonstrator amplifier; active devices; impedance inverter; output capacitance; power 20 W; wideband LDMOS Doherty power amplifier; wideband matching; Bandwidth; Broadband amplifiers; Capacitance; Impedance matching; Inverters; Operational amplifiers; Power amplifiers; Power generation;

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.2010.5515172

Filename

5515172