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A Low Jitter 5 Mhz To 180 Mhz Clock Synthesizer For Video Graphics

The design of a high performance clock synthesizer for Video Graphic Applications, is described. The device can generate up to 32 clock frequencies in the range of 5 MHz to 180 MHz. The chip has been implemented in a 0.9 micron digital CMOS technology and occupies an area of 8.9 mm’. It requires no external components other than a crystal. A phase jitter of about 1% has been achieved at a frequency of 180 MHz. This monolithic device is intended to replace the multiple crystal oscillators and the high frequency multipliers that are currently found on the Video Graphics boards in Personal Computers and Work Stations.