A 0.5-to-480MHz Self-Referenced CMOS Clock Generator with 90ppm Total Frequency Error and Spread-Spectrum Capability. - Michael S. McCorquodale; Scott M. Pernia; Justin D. O'Day; Gordon A. Carichner; Eric D. Marsman; Nam Nguyen; Sundus Kubba; Si Nguyen; Jonathan J. Kuhn; Richard B. Brown (ISSCC, 2008)