Development of Voltage-controlled Saw Oscillator (vcso) for Fiber-optic Communication Systems
نویسندگان
چکیده
Oscillators based on the SAW (surface acoustic wave) technology in general offer lower noise compared to the conventional crystal oscillators at higher frequencies. VCSO (voltage-controlled SAW oscillator) can be an important component in the phase lock loop (PLL) subsystem for clock and data recovery (CDR), clock smoothing or frequency translation in the SONET/SDH (Synchronous Optical Network / Synchronous Digital Hierarchy) fiber-optic communication systems. In this paper, the developing procedures and test results for a 622.08 MHz VCSO are recorded. The test results include the waveform, variation of frequency over control voltage range, and phase noise. The pulling range, frequency-voltage linearity and phase jitter measured for the first prototypes are +170 ppm/-190 ppm, 12 % and 0.17 pSec, respectively.
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