An Approach to Ultra-Broadband Medium-Power MMIC Cascode-Pair Distributed Amplifier Design

Qun WU  Yu-Ming WU  Jia-Hui FU  Bo-Shi JIN  Jong-Chul LEE  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.7   pp.1353-1357
Publication Date: 2005/07/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.7.1353
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Recent Technologies of Microwave and Millimeter-Wave Devices Focusing on Miniaturization and Advancement in Performance with Their Applications)
distributed amplifier,  power amplifier,  PHEMT,  cascode,  

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This paper presents a cascode-pair distributed amplifier design approach using 0.25 µm GaAs-based PHEMT MMIC technology, which covers 2-32 GHz. Electromagnetic simulation results show that this amplifier achieves 18 dB gain from 2 to 32 GHz and 0.5 dB gain flatness over the band. The reflected coefficients at the input and output ports are below -10 dB up to 27 GHz. The output power at 1 dB compression is greater than 24 dBm at 20 GHz. An appropriate feedback resistance can be utilized to improve P1 dB for about 6 dBm. The DOE (design of experiment) approach is carried out by a simulation tool for better performance and tolerance of the devices is also analyzed. The circuit configuration is capable of operating over ultra-broad band amplification.