One of the main drawback of the Doherty architecture is related to the intrinsic lower power gain attainable with respect to the nominal value assured by the Main amplifier. A proposed solution, discussed in this paper, is based on the use of different bias voltages for the Main and Auxiliary amplifiers. To validate the methodology, a Doherty Power Amplifier (DPA) in LDMOS technology is presented. The DPA is designed to operate at 2.14 GHz (UMTS), based on two equal devices with 17.4 mm of gate periphery. An uneven power splitter based on Branch Line coupler is adopted to deliver more power to the Auxiliary device. A saturated output power (Pout) of 43 dBm with a drain (power added) efficiency of 47% (43.5%) have been measured, with a corresponding power gain of 11 dB. The drain (power added) efficiency is kept higher than 36% (33%) in a 6dB of Output back-off (OBO) with an almost constant behaviour.

Colantonio, P., Giannini, F., Giofre', R., Piacentini, M., Piazzon, L. (2009). A design approach to increase gain feature of a Doherty power amplifier. In Proceedings of the 4th European microwave integrated circuit conference, EuMIC 2009 (pp.25-28).

A design approach to increase gain feature of a Doherty power amplifier

COLANTONIO, PAOLO;GIANNINI, FRANCO;GIOFRE', ROCCO;PIAZZON, LUCA
2009-09-01

Abstract

One of the main drawback of the Doherty architecture is related to the intrinsic lower power gain attainable with respect to the nominal value assured by the Main amplifier. A proposed solution, discussed in this paper, is based on the use of different bias voltages for the Main and Auxiliary amplifiers. To validate the methodology, a Doherty Power Amplifier (DPA) in LDMOS technology is presented. The DPA is designed to operate at 2.14 GHz (UMTS), based on two equal devices with 17.4 mm of gate periphery. An uneven power splitter based on Branch Line coupler is adopted to deliver more power to the Auxiliary device. A saturated output power (Pout) of 43 dBm with a drain (power added) efficiency of 47% (43.5%) have been measured, with a corresponding power gain of 11 dB. The drain (power added) efficiency is kept higher than 36% (33%) in a 6dB of Output back-off (OBO) with an almost constant behaviour.
European microwave integrated circuits conference, EuMIC
Roma, Italia
2009
Rilevanza internazionale
contributo
set-2009
Settore ING-INF/01 - ELETTRONICA
English
Auxiliary amplifiers; Auxiliary device; Back-off; Branch line couplers; Design approaches; Doherty; Doherty power amplifier; Gate periphery; Main amplifiers; Power gains; Power splitters; Saturated output power
Intervento a convegno
Colantonio, P., Giannini, F., Giofre', R., Piacentini, M., Piazzon, L. (2009). A design approach to increase gain feature of a Doherty power amplifier. In Proceedings of the 4th European microwave integrated circuit conference, EuMIC 2009 (pp.25-28).
Colantonio, P; Giannini, F; Giofre', R; Piacentini, M; Piazzon, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/12999
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