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Portable design of ADPLL for TV applications

Abstract : Local oscillators are key buildings in radio communication system. They are considered as intensively analog blocks and then more sensitive to internal noise than digital blocks. This noise is up-converted to phase noise around the carrier frequency at the output of the oscillator. High performance of lo in terms of low phase noise is paid by high surface circuit or by high power consumption. One solution, proposed in the literature, is the all digital phase locked loops ADPLL. Within, digital blocks replace the analog blocks, such as the phase comparator and the loop filter. In this thesis, down to top behavior model of ADPLL is developed using VHDL-AMS. This model includes oscillator phase noise and TDC quantification noise. The modeling of the DCO is based on the linear time variant LTV model of phase noise that is based on the impulse sensitivity function ISF of the oscillator. We are interested in this work by the design and modeling of the DCO and of the TDC because of their noisy behavior. We are interested in this work in the design of digital controlled ring oscillator. We opt for nine-stage ring interpolative oscillator made by nor cells for its larger tuning range than inverter based ring oscillators. We propose an ISF based design strategy that can optimize the design variables of ring oscillators for minimum phase noise. In order to minimize the circuit area and the power consumption, we propose to merge DCO and TDC architectures. TDC uses the ring status to determinate the position of the rising or the falling edge of the oscillator waveform that is propagating in the ring at the rising edge of the reference.
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Contributor : Wissam Altabban Connect in order to contact the contributor
Submitted on : Tuesday, March 1, 2011 - 12:56:37 AM
Last modification on : Friday, July 31, 2020 - 10:44:07 AM
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  • HAL Id : pastel-00570695, version 1



Wissam Altabban. Portable design of ADPLL for TV applications. Electronics. Télécom ParisTech, 2009. English. ⟨pastel-00570695⟩



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