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In this paper, a spread-spectrum clock generator (SSCG) with triangular modulation is presented. The proposed SSCG with a third-order sigma-delta modulator can generate clocks with center spread ratios of 0.25%, 1%, 1.75%, 2.5%, 3.5%, 5% and down spread ratios of 0.5%, 2%, 3.5%, 5%, 7%, 10%. The SSCG is implemented on a chip using SMIC 0.13 um CMOS process. Measurements show that 11.31 dB attenuation...
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