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A Spread Spectrum Clock Generator Using Digital Tracking Scheme
Takefumi YOSHIKAWA Tsuyoshi EBUCHI Yukio ARIMA Toru IWATA
Publication
IEICE TRANSACTIONS on Electronics
Vol.E88-C
No.6
pp.1288-1289 Publication Date: 2005/06/01 Online ISSN:
DOI: 10.1093/ietele/e88-c.6.1288 Print ISSN: 0916-8516 Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit and Device Technologies) Category: PLL Keyword: PLL, spread spectrum clocking, EMI, phase interpolator,
Full Text: PDF(594.1KB)>>
Summary:
A Spread Spectrum Clock Generator (SSCG) using Digital Tracking scheme (DT-SSCG) is described. Using digital tracking control outside a PLL, DT-SSCG can realize stable modulation characteristic independent of the PLL constants. Moreover, DT-SSCG can apply to various modulation profiles easily by brief change of the digital tracking parameters. A test chip has realized the fitting of 5000 ppm downspread with 6.02 dB and 8.02 dB spectrum peak reduction for triangle and Non-Linear modulation.
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