| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital modulator using a polyphase upconverter structure. SOLUTION: Said problem is solved by an upconverter circuit comprising a clock which defines input polyphase cycle sequences; a polyphase component generator for supplying three or polyphase components at each input polyphase cycle; a memory for storing the polyphase components from at least one polyphase cycle prior to the current polyphase cycle, a plurality of filters wherein each filter processes a plurality of the polyphase components stored in the memory, for generating a filtered polyphase component corresponding to that filter; and a multiplexer which outputs the filtered multi-phase components in a predetermined order to generate a filtered output signal. COPYRIGHT: (C)2006,JPO&NCIPI
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