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The maintenance of HPA MMIC's efficiency for K-band
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- Authors
- Hong-gu Ji, Inkwon Ju, Donghwnag Shin, Sungmo Mun, Inbok Yom
- Issue Date
- 2013-11
- Citation
- Asia-Pacific Microwave Conference (APMC) 2013, pp.751-753
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- This paper describes methods of supporting efficiency of an HPA at K band. We designed and fabricated HPA MMIC for K band using UMS 0.25 um GaAs process and then added adaptive biasing circuits for preservation of HPA efficiency. The circuits for maintenance of PAE consist of a directional coupler, a RF detector, a buffer amplifier and a DCDC convertor. The 8V supplied HPA's PAE is presented 13.5 % at 32.3 dBm but adaptive bias supplied HPA's PAE is displayed 18.2 % at Pout 31.9 dBm. The PAE of adaptive biased HPA increases 4.7 % than 8 V supplied HPA. Also, the amplifier PAE is maintained at back off 3.5 dB in CW operation conditions. The MMIC power amplifier and adaptive biasing circuits for HPA MMIC's efficiency are presented in this paper. © 2013 IEEE.
- KSP Keywords
- Adaptive biasing, Back-off, GaAs process, K-band, MMIC power amplifier, Operation condition, RF Detector, biasing circuit, buffer amplifier, directional coupler(DC), power amplifiers(PAs)