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Digital implementation of analog function is becoming attractive in CMOS ICs, given the low supply voltage of ultra-scaled process. The conventional fractional-N frequency synthesizers suffer form the fractional spur due to the application of fractional divider. A new architecture of an all digital fractional-N phase-locked loop based frequency synthesizer is presented in this paper. The unique feature...
An all-digital phase-locked loop (ADPLL) with fast acquisition and low power digitally controlled oscillator (DCO) is presented. The proposed ADPLL is designed with a unique lock-in process by employing a time-to-digital converter. Both the frequency of the reference clock and the delay between DCO output and DCO clock are measured. A carefully designed reset process reduces the phase lock into two...
An all-digital phase-locked loop that achieves fast acquisition and low jitter was developed for high-speed clock generation. By employing a time-to-digital converter (TDC), the frequency difference is precisely measured and converted to the control word of the digital oscillator. Using this feature, the ADPLL has a faster lock-in time than previous digital phaselocked loops. The ADPLL was implemented...
In this paper, a low power and low jitter 12-bit CMOS digitally controlled oscillator (DCO) design is presented. The CMOS DCO is designed based on a ring oscillator implemented with Schmitt trigger based inverters. Simulations of the proposed DCO using 32 nm CMOS predictive transistor model (PTM) achieves controllable frequency range of 570 MHz~850 MHz with a wide linearity. Monte Carlo simulation...
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