| Feedforward 선형 전력증폭기를 위한 에러증폭기의 구현 및 성능평가에 관한 연구 |
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전중성, 조희제, 김선근, 김기문 |
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| A Study on Implementation and Performance Evaluation of Error Amplifier for the Feedforward Linear Power Amplifier |
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Joong-Sung Jeon, Hee-Jea Cho, Seon-Keun Kim, Ki-Moon Kim |
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| Abstract |
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In this paper, We tested and fabricated the error amplifier for the 15 Watt linear power amplifier for the IMT-2000 baseband station. The error amplifier was comprised of subtractor for detecting intermodulation distortion, variable attenuator for control amplitude, variable phase shifter for control phase, low power amplifier and high power amplifier. This component was designed on the RO4350 substrate and integrated the aluminum case with active biasing circuit. For suppression of spurious, the through capacitance was used. The characteristics of error amplifier measured up to 45㏈ gain, ± 0.66㏈ gain flatness and -15㏈ input return loss. Results of application to the 15 Watt feedforward Linear Power Amplifier, the error amplifier improved with 27㏈ cancellation from 34㏈c to 61㏈c IM₃. |
| Key Words:
RF 전력증폭기;
Error Amplifier;Feedforward;LPA;RF Power Amplifier;IM₃ |
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