Abstract
As operating at high frequencies, currents and voltages present in the circuits and the signal traces lead to a great Electro-Magnetic Interference (EMI). Serial AT Attachment (Serial-ATA) is one of the popular external storage specifications. There are many methods to diminish EMI, and spread spectrum is the simplest and the most efficient one among these solutions. Spread spectrum slightly modulates the frequency of a clock signal, and spread it over a manageable bandwidth. Energy peaks at specific frequencies are diminished. In this thesis, we proposed a Spread Spectrum Clock Generator (SSCG). The spread spectrum function of the SSCG is achieved by modulating the control voltage of the VCO.The SSCG generates clocks at 1.5 GHz, a 5000 ppm down spread with a triangular waveform frequency modulation of 33 kHz. The circuit is fabricated with 0.35 um CMOS technology. The non-spread spectrum clocking has a measured jitter of 87 ps and the peak amplitude reduction is about 23 dB in spread spectrum mode. The total power consumption is 65 mW .
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