--Coupled LC oscillators are known to provide good performance in terms of phase noise, signal amplitude, power consumption, and quadrature output signals. However, IQ amplitude and phase mismatches in these oscillators can be quite large due to the serious mismatch problem of large area inductors and varactors. A simple design modification of the coupled LC oscillators shows a significant impr...

TAMPERE UNIVERSITY OF TECHNOLOGY Master’s Degree Program in Information Technology Samara, Lutfi: Phase Noise Estimation and Mitigation in Uplink OFDMA Master of Science Thesis: 46 Pages October 2013 Major: Communications Engineering Examiners: Prof. Mikko Valkama and Dr. Ville Syrjälä

We present an analytical frequency-domain phase noise model for fractional-N phase-locked loops (PLL). The model includes the noise of the crystal reference, the reference input buffer, the voltage-controlled oscillator (VCO), the loop filter, charge pump device noise, sigma-delta modulator (SDM) noise including its effect on the in-band phase noise. Thermal device noise of the charge pump and ...

Jitter and phase noise properties of phase-locked loops (PLL) are analyzed, identifying various forms of jitter and phase noise in PLLs. The effects of different building blocks on the jitter and phase noise performance of PLLs are demonstrated through a parallel analytical and graphical treatment of noise evolution in the phaselocked loop.

The performance of long-haul high speed coherent optical fiber communication systems is significantly degraded by the laser phase noise and the equalization enhanced phase noise (EEPN). In this paper, the analysis of the one-tap normalized least-mean-square (LMS) carrier phase recovery (CPR) is carried out and the close-form expression is investigated for quadrature phase shift keying (QPSK) co...

Interpretation of phase-noise generating mechanism in oscillators relies on approximate and numerical calculations for analysis, and simulation tools for synthesis. In this paper, a comprehensive, yet intuitive, phase-noise model is derived as a function of oscillator circuit parameters, suiting both analysis and synthesis of oscillators. Contributions of all noise sources to the phase noise of...

Many of the existing theories on phase-noise generation in oscillators are concerned with the noise originating from the active part and the resonator, while the contribution of the biasing noise is usually neglected. However, some recent theories have enlightened that the contribution of the biasing noise to the overall phase noise of the oscillator, actually, overwhelms all the other contribu...

Using coherent optical detection and digital signal processing, laser phase noise and equalization enhanced phase noise can be effectively mitigated using the feed-forward and feed-back carrier phase recovery approaches. In this paper, theoretical analyses of feed-back and feed-forward carrier phase recovery methods have been carried out in the long-haul high-speed n-level phase shift keying (n...

An effective dynamical description of a general class of stochastic phase oscillators is presented. For this, the effective phase velocity is defined either by the stochastic phase oscillators invariant probability density or its first passage times. Using the first approach the effective phase exhibits the correct frequency and invariant distribution density, whereas the second approach models...