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Design of Feedforward Linear Power Amplifier using Novel Injection Method of a Pilot Signal  

이경희 (한국전자통신연구원 전파기반연구부)
박웅희 (한국전자통신연구원 전파기반연구부)
강상기 (한국전자통신연구원 전파기반연구부)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.13, no.10, 2002 , pp. 998-1004 More about this Journal
Abstract
This paper reports a design of feedforward linear power amplifier using pilot tone for IMT-2000 band repeaters accepting multi-carrier. As this time pilot tone is applied to the circuit differently from the existing method. Only one pilot tone is used in both 1-st loop(IMD abstraction loop) and 2-nd loop(IMD cancellation loop) to cancell IMD signals automatically according to variation of frequency or power level of input signals. As an experiment, in range of 2110 MHz - 2170 MHz at LPA output power of $20 W_{avg}$, IMD characteristics of over 20 dB was improved maintaining below -60 dBc considering respective 20 MHz. Therefore the supposed feedforward linear power amplifier can be used for linear power amplifier in IMT-2000 band repeaters.
Keywords
Feedforward; LPA; Pilot; IMD;
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