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A spread-spectrum clock generator with triangular modulation

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3 Author(s)
Hsiang-Hui Chang ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; I-Hui Hua ; Shen-Iuan Liu

In this paper, a spread-spectrum clock generator (SSCG) with triangular modulation is presented. Only a divider and a programmable charge pump are added into a conventional clock generator to accomplish the spread-spectrum function. The proposed circuit has been fabricated in a 0.35-μm CMOS single-poly quadruple-metal process. The proposed SSCG can generate clocks of 66, 133, and 266 MHz with center spread ratios of 0.5%, 1%, 1.5%, 2%, and 2.5%. Experimental results confirm the theoretical analyses.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 4 )