ETRI Journal
- Volume 29 Issue 4
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- Pages.536-538
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- 2007
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- 1225-6463(pISSN)
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- 2233-7326(eISSN)
A Linear Power Amplifier Design Using an Analog Feedforward Method
- Park, Ung-Hee (Department of Electronics Engineering, Kangwon National University) ;
- Noh, Haeng-Sook (Digital Broadcasting Division, ETRI)
- Received : 2007.03.13
- Published : 2007.08.31
Abstract
We propose and describe the fabrication of a linear power amplifier (LPA) using a new analog feedforward method for the IMT-2000 frequency band (2,110-2,170 MHz). The proposed analog feedforward circuit, which operates without a pilot tone or a microprocessor, is a small and simple structure. When the output power of the fabricated LPA is about 44 dBm for a two-tone input signal in the IMT-2000 frequency band, the magnitude of the intermodulation signals is below -60 dBc and the power efficiency is about 7%. In comparison to the fabricated main amplifier, the magnitude of the third intermodulation signal decreases over 24 dB in the IMT-2000 frequency band.