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Capacitive coupling improves both phase noise and phase accuracy in coupled LC oscillators since the coupling current is in phase with the regeneration current. A prototype 3 GHz PLL with four LC oscillator stages and capacitive coupling is fabricated in 0.13mum CMOS. The long term measured RMS jitter of the buffered clock from the PLL is 1.61ps and the pk-pk jitter is 13.33ps
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