DIGITAL LINEARIZER FOR TRANSMITTER USING MICROWAVE FREQUENCY

摘要

PURPOSE: A digital linear device for transmission using frequency microwave frequency is provided to reduce a Back-off margin, thereby gaining high power efficiency. CONSTITUTION: An input frequency down converter(110) performs converting frequency down about an IF(Intermediate Frequency) signal. A digital pre-distortion linear unit(130) removes a cross modulation signal by a signal feedback from a digital signal and an amplifier of a first A/D converter unit(120). A feedback processing unit(160) converts an output signal of the amplifier to the feedback signal. A frequency up converter(150) converts an IF signal of a D/A converter into microwave frequency.