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60 Watt Doherty amplifiers using high gain 2-stage hybrid amplifier modules

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4 Author(s)
Crescenzi, E.J. ; Cree Microwave Corp., Sunnyvale, CA, USA ; Pengelly, R.S. ; Wood, S.M. ; Buss, R.E.

A Doherty amplifier has been constructed using small surface-mount 2-stage 30 W hybrid amplifier modules. These modules offer higher gain and simpler matching than do discrete transistors. This 26 dB gain Doherty amplifier uses a conventional 2-way topology, with class AB "main" branch and class C "peaking" branch output stages. A 3GPP 2-WCDMA signal output level of 10 Watts is achieved with 26.4% efficiency and < -40 dBc ACLR and -38 dBc IM3s. When augmented by pre-distortion, 12.5 Watts of 2-WCDMA signal output is produced with < -51 dBc ACLR and -54 dBc IM3s, with 26.8 % efficiency.

Published in:

Microwave Symposium Digest, 2005 IEEE MTT-S International

Date of Conference:

12-17 June 2005

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