| Title |
A implementation of predistorter using the Series Diode Linearizer for RF Amplifiers |
| Authors |
원용규(Won, Yong-Kyu) ; 윤만수(Yun, Man-Soo) ; 이상철(Lee, Sang-Cheol) ; 정찬수(Chung, Chan-Soo) |
| Keywords |
혼변조 왜곡 Linearizer ; predistortion ; IMD |
| Abstract |
In this paper, a predistortion linearizer using series diode is proposed for linearizing the power amplifier in microwave radio systems. The power amplifier should be operated near saturation region to achieve high efficiency. But at this region, amplitude and phase distortions of the amplifier remarkably increase with the increase of input power and cause a significant adjacent channel interference. The linearizer is composed of a series diode with a parallel capacitor, which provides positive amplitude and negative phase deviations with the increasing input power. This type of linearizer using the nonlinearity of diode has improved the C/I(Carrier to Intermodulation Distortion) ratio well. By applying this linearizer to two-tone 880MHz power amplifier, adjacent channel leakage power is improved up to 5dBm. |