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19.6 A 0.5-to-480MHz Self-Referenced CMOS Clock Generator with 90ppm Total Frequency Error and Spread-Spectrum Capability

By Michael S. Mccorquodale, Scott M. Pernia, Justin D. O’day, Gordy Carichner, Eric Marsman, Nam Nguyen, Sundus Kubba, Si Nguyen, Jon Kuhn and Richard B. Brown


The quartz crystal (XTAL) oscillator is one of the last components in electronic systems that has yet to be integrated. Consequently, integrating crystal oscillators (XOs) has become a research target for the developers of MEMS microresonators. Recent and representative examples of MEMS oscillators include [1] and [2]. Unfortunately, MEMS microresonators introduce certain challenges including limited power-handling capability [2]. The limitations of MEMS have resulted in recent work, e.g., [3] and [4], exploring the limits of compensated CMOS oscillators as an alternative solution. The advent of RF CMOS circuits and associated advances in CMOS process technology have enabled the development of low-noise integrated LC oscillators (LCOs) [5], which are suitable for replacing XOs in USB applications [3]. This work demonstrates a self-referenced CMOS LCO, or CMOS harmonic oscillator (CHO), that exhibits 90ppm total frequency error ove

Year: 2009
OAI identifier: oai:CiteSeerX.psu:
Provided by: CiteSeerX
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