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A Study on the Effects of Gain Flatness of Feedforward Power Amplifier for IMT-2000 Band  

정성찬 (성균관대학교 전보통신공학과)
박천석 (성균관대학교 전보통신공학과)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.14, no.7, 2003 , pp. 762-768 More about this Journal
Abstract
This paper reports the effects of gain flatness for linearity improvement of feedforward power amplifier fur IMT-2000 band. To investigate the operational characteristics for gain flatness of each amplifier, WCDMA 4FA input signal was used and measured 10 W output power. Especially, linearity improvement for variation of gain flatness of each amplifier was investigated that have an effect on linearity improvement such as delay line, phase, and amplitude imbalances. Variation of gain flatness of main amplifier is 40 MHz and of error amplifier is 40 MHz and 80 MHz bandwidth, respectively. Measured results, gain flatness of main amplifier is less than 1.5 dB and of error amplifier is less than 0.5 dB for more than 20 dB improvement at 5 MHz offset. In addition to that results, the characteristics of feedforward amplifier are drastically varied by gain flatness of error amplifier and it is shown that gain flatness of error amplifier is more important factor for linearity improvement.
Keywords
Feedforward; Gain Flatness; Amplifier; IMT-2000;
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