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Clock and Data Recovery based on Phase Shifting and Accordion Oscillator

Fatemi Mofrad, Ali | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56581 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fotowat Ahmady, Ali; Akbar, Fatemeh
  7. Abstract:
  8. The continuous growth of network traffic and people's demand for higher data rates, have driven wireline communication systems towards higher data rates. In these systems, the power consumption of these transmitters and receivers is a crucial and influential factor. This paper presents two different solutions to reduce the power consumption and area of these systems. In the first solution, a low-power phase shifter with variable phase and amplitude control is introduced. The changes in these parameters are mutually orthogonal, ensuring that a change in one characteristic does not affect the others. This phase shifter can be used to generate clock pulses with different phases in wireline communication systems. It has been designed for operation in the frequency range of 4–4.2 gigahertz using 180-nanometer CMOS technology, with a power consumption of 5.4 milliwatts and a signal attenuation of -7 decibels at 4.15 gigahertz. Besides wireline communications, this phase shifter has extensive applications in phased array systems and wireless communications, which could be explored in future research. The second solution proposes a wireline communication system based on a ring oscillator. This system has low power consumption, with the power consumption of the clock pulse generation part in the transmitter and receiver being less than 1 milliwatt, including its peripheral circuits (like phase detector, loop filters and …. Both the transmitter and receiver of this system have been designed, presented, and simulated. In this context, an accordion-type oscillator is investigated, allowing us not only to control the loop frequency but also to adjust each phase individually to its ideal value, eliminating any discrepancies due to mismatch in rings block, layout of the system or other various reasons
  9. Keywords:
  10. Phase Shifter Circuit ; Ring Oscillator ; Wire-line Network ; Accordion Oscillator ; Clock and Data Recovery Circuit

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