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Perfect Timing II Book
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Have you ever designed a clock circuit where you did something just because it had been
done that way in the past？ Or have you ever used a particular part without knowing why
purely because it was on another design？ This happens quite often with today’s designs，
particularly with clock generation and distribution circuits.
This book has been written by engineers for engineers who want to design clock circuitry
using the best methods. Its focus is on the practical implementation of clock generation
and distribution circuits for use in high-speed digital designs. This material was gathered
from many time-tested designs， as well as from new techniques learned to address th
needs for faster clock frequencies.
The ultimate goal is to have clean， solid clocks. Many companies now employ full
departments dedicated to signal integrity. They perform simulations， design reviews， and
a variety of analyses to ensure the best operation of the clock. There are several factors
designers need to consider that affect the clock waveform. This book will address many of
these key design issues for clocks.
Clock generators play a key role in designs today. In the pursuit of high-speed， many
systems have adopted synchronous design styles. With this methodology comes the need
for a variety of frequencies and many copies of the same clock. In most systems， these
clocks need to be in phase with one another. If they are not， precious cycle time is lost
Skew between clocks becomes very important in keeping all of the devices operating at
their peak rates. Specialized clock buffers have led the way in providing clean， accurate
clock signals.
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