iii Sammanfattning v Preface vii Contributions ix Abbreviations xi Acknowledgments xiii

A digital compensation method is described that allows fractional-N frequency synthesizers to be directly modulated at high data rates while simultaneously achieving good noise performance. The technique allows digital phase/frequency modulation to be achieved at high data rates (> 1 Mbit/s) without mixers or D/A converters in the modulation path. The resulting transmitter design is primarily d...

I am grateful of Dr. Joy Laskar who guided and taught me with his endless energy and encouragement. I would like to thank Dr. Kyutae Lim and Dr. Woonyun Kim for their advice and support for my research. I am greatly indebted to the members of the Microwave Applications Group (MAG) for their assistance and cooperation, especially to cognitive radio (CR) team members. I also owe special thanks to...

This article analyses the effect of noise and nonlinearity in optoelectronic phase-locked loops (OEPLLs). The OEPLL phase-locks a microwave oscillator on envelope optical pulse train from mode-locked laser (MLL). phase detector this type is called balanced (BOMPD) operates mixed electro-optical domain. main sources BOMPD, such as shot photodiodes, generation-recombination relative intensity las...

This paper explores the relationship between intelligibility and comprehensibility in speech synthesizers, and it designs an appropriate comprehension task for evaluating the speech synthesizers’ comprehensibility. Previous studies have predicted that a speech synthesizer with higher intelligibility will have higher performance in comprehension. Also, since the two most popular speech synthesis...

A digital compensation method and key circuits are presented that allow fractional-N synthesizers to be modulated at data rates greatly exceeding their bandwidth. Using this technique, a 1.8-GHz transmitter capable of digital frequency modulation at 2.5 Mb/s can be achieved with only two components: a frequency synthesizer and a digital transmit filter. A prototype transmitter was constructed t...

A digital compensation method and key circuits are presented that allow fractional-N synthesizers to be modulated at data rates greatly exceeding their bandwidth. Using this technique, a 1.8-GHz transmitter capable of digital frequency modulation at 2.5 Mb/s can be achieved with only two components: a frequency synthesizer and a digital transmit filter. A prototype transmitter was constructed t...

Abstract Radio telescopes are among the applications with highest demands on a local oscillator (LO), which is used to receive and process signals coming from sky. Therefore modules providing required LO signal have traditionally been big complicated. To overcome this disadvantage, we implement our own integrated frequency synthesizer inside small module in article. With able achieve jitter of ...