Jitter is the bane of all designers of
buses and communications products
where speeds exceed the 1-Gbit/s rate.
Multigig’s latest clock ICs can give you more
jitter headroom in your design (see the figure).
Designated the QuietClock family, this
selection of clock products limits rms jitter to
typically less than 60 femtoseconds (fs).
As high-speed communications protocols
move to 10 Gbits/s, 40 Gbits/s, and higher
data rates, timing budgets increasingly get
squeezed. Most existing clock and synthesizer
solutions cannot achieve the low jitter necessary
to minimize dropped packets, enable
interoperability between computer systems,
and ease performance bottlenecks. Jitter is
the key parameter designers want to minimize
to unlock higher system throughput.
The QuietClock family provides clock
synthesizers that can open constricted eye
diagrams, enhance bit error rates (BER), and
maximize precious timing margin. These
devices also offer three to five times lower
jitter and significantly lower phase noise than
the typical solution while consuming 30%
to 50% less power. Other benefits include
higher reliability, frequency programmability,
flexibility, and lower cost.
These benefits are derived from Multigig’s
patented RotaryWave technology, which
makes an oscillator with a travelling wave
technique. The heart of the oscillator is a
differential transmission line whose length,
inductance, and capacitance set the frequency.
It is provided with taps and amplifiers to
make it a distributed amplifier. The transmission
line creates a closed loop with the ends
connected together with a one half-twist like
in a Mobius strip. The result is a very stable
oscillator with low jitter and low phase noise.
QuietClock synthesizers provide an ultralow
jitter and phase noise reference clock
signal to communication, computing, and
networking interface devices. Typical applications
include Gigabit Ethernet (1GE), 10
Gigabit Ethernet (10GE), Sonet/SDH, Fibre
Channel, Rapid I/O, SATA, and InfiniBand.
Most standard frequencies are available.
The product family uses supplies of 3.3
and 2.5 V. These devices incorporate one to
10 outputs from a mix of single-ended (LVCMOS)
and differential (LVPECL and LVDS)
outputs. They also support the full industrial
temperature range (–40°C to 85°C). More
than a dozen different models are available.
Sampling now, prices start at $2.75 for
1000-unit quantities.
Multigig Inc.
www.multigig.com
