PROGRAMMABLE UP/DOWN CONVERSION DEVICE AND OPERATING METHOD THEREOF CAPABLE OF PROCESSING AN INTERMEDIATE FREQUENCY SIGNAL WHEN AN INTERMEDIATE FREQUENCY IS CHANGED

摘要

PURPOSE: A programmable up/down conversion device and an operating method thereof are provided to prevent the sag of a signal and an energy attenuation phenomenon by using a digital filter and an up-down sampler.;CONSTITUTION: A DDS(Direct Digital Synthesizer)(120) outputs a first carrier signal and a second carrier signal with a digital carrier frequency. A first multiplexer(110) generates a first digital IF(Intermediate Frequency) signal by multiplying a first sample signal with the first carrier signal. The first multiplexer outputs a first digital IF signal into a digital/analog converter(130). The digital/analog converter converts a first digital IF signal into a first analog IF signal. An analog/digital converter(140) converts a second analog IF signal into a second digital IF signal. A second multiplexer(115) recovers a second sample signal by multiplying the second digital IF signal with the second carrier signal. A second IF signal processor(204) recovers a second digital data signal by filtering the second sample signal and downwardly converting a frequency.;COPYRIGHT KIPO 2012