Abstract
Abstract In this paper, a 613 GHz ultra high speed frequency synthesizer having minimum 30 kHz step size and minimum 500 ns frequency settling time is proposed. In order to obtain fast settling time, fine resolution, and good phase noise performance, wideband output frequencies were synthesized based on DDS(Direct Digital Synthesizer) and analog direct frequency synthesis technology. The phase noise performance of wideband frequency synthesizer was estimated by the superposition theory and its results were compared with mea-sured ones. The measured frequency settling time was below 500 ns, phase noise was below 106 dBc @ 10 kHz at 13 GHz, and frequency accuracy was measured below ±2 kHz. Key words: Wideband Synthesizer, High Speed, Fine Resolution, DDS OPQRS(Agency for Defense Development) *TU QGVWQ(Department of Radio Science & Engineering, Chungnam National University)Manuscript received August 29, 2014 ; Revised September 29, 2014 ; Accepted November 7, 2014. (ID No. 20140829-066)Corresponding Author: Dong-Chul Park (e-mail: dcpark@cnu.ac.kr)
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