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Improvement of Phase Noise for Oscillator Using Frequency Locked Loop
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 Title & Authors
Improvement of Phase Noise for Oscillator Using Frequency Locked Loop
Kim, Wook-Lae; Lee, Chang-Dae; Kim, Yong-Nam; Im, Pyung-Soon; Lee, Dong-Hyun; Yeom, Kyung-Whan;
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 Abstract
In this paper, we showed the phase noise of voltage controlled oscillator(VCO) can be radically improved using FLL(Frequency Locked Loop). At first, a 5 GHz VCO is fabricated using a hair-pin resonator. The fabricated VCO shows a phase noise of -53.1 dBc/Hz at 1 kHz frequency offset. In order to improve the phase noise of the fabricated VCO, a FLL is constructed using the feedback loop that consists of the VCO, a frequency detector composed of 5 GHz resonator, loop-filter, and level shifter. The fabricated FLL is designed to oscillate at a frequency of 5 GHz, and its measured phase noise is about -120.6 dBc/Hz at 1 kHz offset frequency. As a result, the phase noise of VCO can be radically improved by about 67.5 dB applying FLL. In addition, the measured phase noise performance is close to that of crystal oscillator.
 Keywords
Voltage Controlled Oscillator;Frequency Locked Loop;Phase Noise;
 Language
Korean
 Cited by
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