Poly-Phase Fractional-N Frequency Synthesizer
نویسنده
چکیده
The aim of this thesis is to present a phase-hopping frequency synthesizer using a Rotary Traveling Wave Oscillator (RTWO), as well as the benefits and limitations of physical realizations. The RTWO is a novel approach to Integrated Circuit (IC) Voltage Controlled Oscillator (VCO) design that employs a differential transmission line terminated on itself in a manner similar to a Möbius strip. Because the RTWO is a geometric construct, it enjoys an availability of precise phases, limited only by transmission line length and minimum feature size in the metal interconnect layers. The system described in this paper consists of a 1GHz, 62-phase RTW-VCO and a poly-phase divider technique[3] that offers 62 division channels per octave up to the oscillator frequency. To increase the spectral coverage, a fractional-N technique is used in the feedback path of the Phase-Locked Loop. c © Andrey Martchovsky Multigig Inc. 2009
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