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A Broadband Almost-Digital Radio Frequency Transmitter with an Efficient Power Amplifier

Jang, W. ; Cordeiro, R. ; Oliveira, A. ; Carvalho, N.B.C.

IEEE Transactions on Microwave Theory and Techniques Vol. 64, Nº 5, pp. 1526 - 1534, May, 2016.

ISSN (print): 0018-9480
ISSN (online): 0018-9480

Journal Impact Factor: 2,711 (in 2008)

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Abstract
A new architecture of an almost-digital radio frequency
transmitter is proposed. It consists of easy-to-have
functional modules. Among the modules, a broadband Doherty
amplifier is focused through a modified design approach. A proofof-
concept transmitter is built and measured. It demonstrates
quite comparable performances: more than 40% of power
amplifier efficiency, adjacent channel leakage ratios between -26
and -37 dB, and average 2.6% of error vector magnitude over
a frequency band from 0.7 to 1.1 GHz, which corresponds to a
fractional bandwidth of 44%, when it is driven by a signal with
5.6 dB of peak-to-average power ratio.