Abstract
In this paper, a new predistortion linearizer for controlling the amplitude of low frequency intermodulation distortion signals is proposed. The low frequency intermodulation distortion (IMD) components are generated by harmonic generator. A vector modulator, modulate fundamental signal with low frequency IMD signals, generates predistortion IMD signals and controls amplitude and phase of them with modulation factors. As a result, this predistorter is suppressed IMD signals of power amplifier effectively. The predistortion linearizer has been manufactured to operate in cellular base-station transmitting band (869-894 MHz). The experimental results show that IMD/sub 3/ of power amplifier are improved more than 20dB for CW two-tone signals. Also, it's improved the adjacent channel power ratio (ACPR) more than 10dB for CDMA (IS-95) signals.
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