Mobius Microsystems - Applications - Spread Spectrum Clocking

USB flash drive Hard disk drive Display/Digital TV Printer Spread Spectrum Clocking

Mobius CHO:

First commercial replacement of quartz crystals in a USB FS interface.
First all-CMOS oscillator to match the accuracy, phase noise and jitter performance of quartz-based crystal oscillators
An all-CMOS, integrated clock with the fastest start-up time
The first, fully integrated Spread Spectrum Clock Generator that eliminates the need for both quartz crystals and PLL ICs.

Spread Spectrum Clocking

With its CHO technology, Mobius Microsystems offers a powerful tool to lower EMI. The MM8511 product builds upon the standard Spread Spectrum Clock Generation (SSCG) technique, by far the most effective and most preferred method to control EMI. Unlike conventional SSCG implementations however, the MM8511 CHO replaces both the quartz crystal and the PLL ICs with a monolithic CMOS die, which generates Spread Spectrum Clocks without the need for an external resonator. The elimination of the quartz crystal improves reliability, eliminates bulky packages from the system and lowers BOM count. The elimination of the PLL improves performance by reducing clock jitter, and lowering phase noise and power consumption. The MM8511 supports common printer frequencies, and features selectable frequency spread percentages and modulation rates.

Spread Spectrum Clocking to Lower EMI