A FORTRAN program has been developed in order to investigate the process of modal parameter estimation and non-parametric system identification. The theory underlying the process of modal parameter estimation is reviewed and the decoupling of a MIMO system into several SISO systems is demonstrated. Modal filtering is shown to be useful in the field of non-parametric system identification and it is shown that it may also be of some use in the field of signal processing. The program is documented. It simulates the output of a n-th order system from which a smaller order subsystem can be decoupled. The modal parameters of a subsystem output signal and its first two derivatives and the modal parameters of a second subsystem output and its first derivative are calculated. The unit step response of the theoretical system and the subsystem are then calculated. The signals are then modal filtered to produce the periodic unit step response and the periodic unit square wave response. Finally, the discrete Fourier coefficients of the periodic unit step response are calculated. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Moving-average matched filters (MAMF's) are a class of digital filters used to detect the presence of a known signal in noise. Designing matched filters requires knowledge of the structure of the signal and the noise. If the spectral density of the noise is not known or is changing with time its spectral characteristics must be estimated. Since spectral estimators derive their estimates from a random process realization, the estimates themselves are probabilistic in nature. The performance of MAMF's based on these estimates must, in turn, be distributed in a probabilistic sense. This thesis investigates the performance of MAMF's designed on the basis of several different spectral estimators. Theoretical aspects of MAMF's and spectral estimators are reviewed and developed. A simulation system is used to exercise the spectral estimators and MAMF's and to provide comparative performance data. A graphical representation, using contour plots, is developed and can be used to predict the performance of a given MAMF/signal/spectral estimator combination. Finally, several methods of generating MAMF's whose output performance is relatively insensitive (or robust) to the probabilistic variations caused by the spectral estimators are developed and evaluated. The latter incorporates knowledge of the empirical distribution of the particular spectral estimator used, as well as the freedom of manipulating the signal. / M.S.

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

by Tai Leong Charn. / Bibliography: leaves R-i-iii / Thesis (M.Phil.)--Chinese University of Hong Kong, 1983

Chok-ki Chan. / Bibliography: leaves 117-122 / Thesis (Ph.D.) - Chinese University of Hong Kong, 1984

Law, Carlos. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 119-122). / Abstracts in English and Chinese. / Abstract --- p.i / 論文摘要 --- p.iii / Acknowledgement --- p.v / Table of Content --- p.vi / List of Figures --- p.ix / List of Tables --- p.xv / List of Abbreviations --- p.xvi / Chapter Chapter 1: --- Introduction --- p.1 / Chapter 1.1 --- Emergence of Multi-band Microwave Circuits --- p.1 / Chapter 1.2 --- Original Contribution --- p.2 / Chapter 1.3 --- Overview of the Thesis Organization --- p.3 / Chapter 1.4 --- "Research Approach, Assumptions and Limitations" --- p.5 / Chapter Chapter 2： --- Fundamentals in Filter and Power Divider Design --- p.7 / Chapter 2.1 --- Filter --- p.7 / Chapter 2.1.1 --- Introduction to Filters --- p.7 / Chapter 2.1.2 --- Transfer Function --- p.8 / Chapter 2.1.3 --- Low-pass Prototype and Elements --- p.11 / Chapter 2.1.4 --- Admittance Inverters --- p.13 / Chapter 2.2 --- Power Divider --- p.20 / Chapter 2.2.1 --- Introduction to Power Dividers --- p.20 / Chapter 2.2.2 --- Wilkinson Power Divider --- p.21 / Chapter 2.2.3 --- Multi-section Power Divider --- p.25 / Chapter 2.2.4 --- Power Divider with Unequal Power Division --- p.27 / Chapter Chapter 3： --- Conventional Multi-band Designs --- p.29 / Chapter 3.1 --- Micro-strip Multi-band Filters --- p.29 / Chapter 3.1.1 --- Parallel Connection of Two Single-band Filters --- p.29 / Chapter 3.1.2 --- "Wide-band, Band-pass Filter and a Band-stop Filter in Cascade" --- p.32 / Chapter 3.1.3 --- Parallel-coupled SIR-based Dual-band Filter --- p.33 / Chapter 3.1.4 --- Vertical-stacked SIR-based Dual-band Filter --- p.34 / Chapter 3.1.5 --- Cross-coupled Hairpin SIR Dual-band Filter --- p.37 / Chapter 3.1.6 --- Folded Open-loop Ring Resonator-based Multi-band Filters --- p.38 / Chapter 3.1.7 --- Stubbed SIR-based Single-band Filter --- p.40 / Chapter 3.1.8 --- Open and Short-circuited Stub-based Dual-band Filter --- p.41 / Chapter 3.1.9 --- Open Stub-based Dual-band Filter --- p.42 / Chapter 3.2 --- Spurious Suppression Techniques for Filters --- p.43 / Chapter 3.2.1 --- Insertion of Band-reject Filters --- p.43 / Chapter 3.2.2 --- Equalization of Eigen-mode Phase Velocities --- p.43 / Chapter 3.2.3 --- Insertion of Open Stubs --- p.45 / Chapter 3.2.4 --- Coupled SIR-based Structures --- p.47 / Chapter 3.2.5 --- Parallel Coupled Line --- p.49 / Chapter 3.2.6 --- Others --- p.50 / Chapter 3.3 --- Dual-band Power Dividers --- p.51 / Chapter 3.3.1 --- Two-section Transmission Line Topology --- p.51 / Chapter 3.3.2 --- Lumped Element-based Topology --- p.53 / Chapter 3.3.3 --- Shunt Stub Topology --- p.56 / Chapter Chapter 4: --- New Dual-band Filter with Wide Upper Stop-band … --- p.59 / Chapter 4.1 --- Proposed Topology --- p.60 / Chapter 4.2 --- Design and Analysis --- p.61 / Chapter 4.3 --- Design Example --- p.73 / Chapter 4.4 --- Summary --- p.79 / Chapter Chapter 5: --- New Tri-band Filter Design --- p.80 / Chapter 5.1 --- Proposed Topology --- p.80 / Chapter 5.2 --- Design and Analysis --- p.82 / Chapter 5.3 --- Design Example --- p.86 / Chapter 5.4 --- Summary --- p.91 / Chapter Chapter 6: --- New Dual-band Power Divider Design I --- p.92 / Chapter 6.1 --- Proposed Topology --- p.92 / Chapter 6.2 --- Design and Analysis --- p.94 / Chapter 6.3 --- Design Example --- p.98 / Chapter 6.4 --- Summary --- p.107 / Chapter Chapter 7: --- New Dual-band Power Divider Design II --- p.108 / Chapter 7.1 --- Proposed Topology --- p.108 / Chapter 7.2 --- Design and Analysis --- p.109 / Chapter 7.3 --- Design Example --- p.112 / Chapter 7.4 --- Summary --- p.115 / Chapter Chapter 8: --- Conclusion --- p.116 / Recommendation for Future Work --- p.118 / References --- p.119 / Author's Publications --- p.123 / Appendix 1: ABCD Parameters --- p.124 / Appendix 2: Program for Tri-band Filter --- p.125 / Appendix 3: Comparison of Dual-band Power Dividers --- p.129 / Appendix 4: Sensitivity of Power Divider to Resistor Variation --- p.146

Thesis (M.S.)--Rochester Institute of Technology, 2007. / Typescript. Includes bibliographical references (leaves 76-77).

Pulse Width Modulation (PWM) has been used extensively for motor control, DC-AC converters, DC-DC converters and in audio applications. The conventional method of generating a pulse width modulated signal involves generating an accurate sawtooth or triangle wave using analog circuits. In CMOS, being analog circuit intensive puts extra constraints on the fabrication process used for manufacture, thus requiring a higher cost than digital CMOS. Delta-Sigma Modulation on the other hand is analog intensive, but requires only quality capacitor matching, which can be obtained with current digital CMOS processes. This thesis describes a method to generate a digital PWM with pulse dithering using a Delta-Sigma modulator. The Delta-Sigma modulator provides accuracy and allows the circuit to be implemented in a digital CMOS process, while the pulse dithering in the PWM spreads out harmonic noise generated from the PWM fundamental frequency. / Graduation date: 1998

A new structure for the implementation of bit/serial adaptive IIR filter is presented. The bit level system consists of gated full adders for the arithmetic unit and data latches for the data path. This approach allows recursive operation of the IIR filter to be implemented without any global interconnections, minimal delay time, chip area and I/O pins. The coefficients of the filter can be updated serially in real time for time invariant and adaptive filtering. A fourth order bit/serial IIR filter is implemented on a 2 micron CMOS technology clocked at 55 MHz. / Graduation date: 1992

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004. / Includes bibliographical references (leaves 108-111). Also available in electronic version. Access restricted to campus users.