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A 280 W LDMOS broadband Doherty PA with 52% of fractional bandwidth based on a multi-line impedance inverter for DVB-T applications

Published online by Cambridge University Press:  07 April 2016

Alessandro Cidronali ,
Niccolò Giovannelli ,
Stefano Maddio ,
Andrea Del Chiaro ,
Christian Schuberth ,
Thomas Magesacher  and
Peter Singerl
Alessandro Cidronali*
Affiliation:
Department of Information Engineering, University of Florence, V. S. Marta, 3 50139 Florence, Italy. Phone: +39.055. 2758543
Niccolò Giovannelli
Affiliation:
Infineon Technologies AG, Neubiberg 85579, Germany
Stefano Maddio
Affiliation:
Department of Information Engineering, University of Florence, V. S. Marta, 3 50139 Florence, Italy. Phone: +39.055. 2758543
Andrea Del Chiaro
Affiliation:
Infineon Technologies AG, Neubiberg 85579, Germany
Christian Schuberth
Affiliation:
Infineon Technologies Austria AG, Villach 9500, Austria
Thomas Magesacher
Affiliation:
Department of Electrical and Information Technology, Lund University, Lund, Sweden
Peter Singerl
Affiliation:
Infineon Technologies AG, Neubiberg 85579, Germany
*
Corresponding author:A. Cidronali Email: alessandro.cidronali@unifi.it
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Abstract

We introduce a new technique for the design of an output combiner for Doherty power amplifier (DPA) and its effective exploitation for the development of a wideband laterally diffused metal oxide semiconductor (LDMOS) DPA. The design is enabled by a two-line impedance inverter for the DPA back-off operation, which is capable of 52% of fractional bandwidth. The technique is validated by the development of a DPA prototype for Ultra high frequency terrestrial digital video broadcast (DVB-T) applications, with optimized peak power and efficiency over 470–806 MHz. The prototype delivers between 40 and 53% of average efficiency across the band, at 49 dBm output power in average across the bandwidth, and supporting DVB-T signals with 8 MHz bandwidth and a peak-to-average power ratio of 10.5 dB. It achieves the target adjacent channel power ratio of −52 dBc at 750 MHz if digital pre-distortion is applied, and provides 47.8 dBm of output power with a drain efficiency of 44.3%.

Keywords

Broadband PALDMOSDoherty power amplifierDVB-T
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 8 , Issue 8 , December 2016 , pp. 1141 - 1153
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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