| 摘要 |
PURPOSE: A BTS(Base Transceiver Station) transmitting apparatus having a linearizer with a feed-forward type is provided to minimize a power loss by a delay line used in the output of a main power amplifier. CONSTITUTION: A main path unit(100) has the first D/A converter(130) for converting a source signal generated in the second modem(110) into an analog signal, the first input/output modulator(140) for converting the converted signal into a frequency, the second HPA(High Power Amplifier)(150) for receiving the converted signal and amplifying the received signal, the second filter(170) for filtering the amplified signal, and the second transmitting unit(180) for transmitting the filtered signal. A DSP unit(200) compares a result in which the decrease of a gain according to the intensity of an inputted signal is multiplied by a power amplifier input signal with an output signal of a real power amplifier for performing a real-time modeling function of the power amplifier so that an error is minimized, and generates an error signal for attenuating a distortion component indicated in the output signal of the amplifier. A feedback path unit(300) converts the output signal of the power amplifier needed for the modeling and transmits the converted signal to the DSP unit(200). An analog error signal generating unit(400) converts the error signal generated by the DSP unit(200) into a desired signal, converts a frequency into an outputting frequency, and amplifies the converted frequency.
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