| Abstrakt: |
In this study, a C~K band frequency synthesizer used in broadband electronic warfare equipment was designed, developed, and the meas- urement results were presented. The structure of the designed frequency synthesizer generates a signal up to 6 GHz using only direct digital synthesizer (DDS) without a mixer or multiplier. For signals above 6 GHz frequency, the structure uses a multiplier. In addition, a variable sampling frequency structure and a DDS circuit were designed to improve signal quality by reducing spurious signals, harmonic signals, and phase noise. The developed frequency synthesizer has different signal quality performance depending on the use of the multiplier, and the C∼G band has output power flatness ±1.7 dB, spurious signal less than −55 dBc, and phase noise less than −95 dBc/Hz (@1 kHz). The H~K band using multiplier has characteristics of output power flatness ±2.0 dB, spurious signal less than −35 dBc, and phase noise less than −80 dBc/Hz (@1 kHz). The results of this study confirmed the miniaturization of the signal generation module in the C∼K band. [ABSTRACT FROM AUTHOR] |
