Title page for ETD etd-01102005-004431

Type of Document

Dissertation

Author

Lipa, Steven ,

Author's Email Address

slipa@eos.ncsu.edu

URN

etd-01102005-004431

Title

Frequency Stability in Distributed Latch Travelling Wave Oscillators

Degree

PhD

Graduate Program

Electrical Engineering

Advisory Committee

Advisor Name	Title
Dr. Michael Steer	Committee Co-Chair
Dr. Paul Franzon	Committee Co-Chair

Keywords

travelling wave oscillators
frequency stability

Date of Defense

2004-12-20

Availability

unrestricted

Abstract

LIPA, STEVEN. Frequency Stability in Distributed Latch Travelling Wave Oscillators. (Under the direction of Dr. Paul Franzon and Dr. Michael Steer) This work presents analysis and
modelling of phase noise and jitter in travelling wave oscillators based on distributed CMOS latches (DLTWOs). These oscillators are capable of generating GHz rate square waves and distributing them over large integrated circuits with low skew.
The results show that the frequency stability of
DLTWOs is comparable to that of well-designed ring oscillators. A time-domain perturbation analysis is presented in which the DLTWO is broken up into a number of stages like a ring oscillator. The time-domain perturbation analysis shows that excess phase is mainly introduced when voltage noise is amplified in the transitioning latches. The time-domain perturbation analysis is verified by impulse sensitivity function (ISF) simulations.
Simulation techniques are described and techniques for drastically reducing the number of simulations required to implement the ISF are introduced. It is shown that very accurate results are possible with as few as 41 simulations and that fairly accurate results are possible with as few as three simulations. Simulation results are compared to
measured results for the first integrated DLTWO circuits ever produced. Design implications are explored giving designers insight into designing DLTWOs with reduced frequency instability.

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