[fyi -- this may be of general interest, but n.b. that this A.D.
marketing - ch]
Clock IC Generates Up to 400 MHz from 1 PPS GPS Signal
The AD9548
<http://www.analog.com/en/clock-and-timing/clock-generation-and-distribution/ad9548/products/product.html>
is the first clock chip in the industry to directly generate up to a 400
MHz output clock, with extremely low phase noise, that is locked to a
standard one pulse-per-second (PPS) GPS clock signal. This performance
is a result of combining Analog Devices' proprietary direct digital
synthesis (DDS) technology with a state-of-the-art digital phase-locked
loop (DPLL). Other solutions for synchronizing to the GPS 1 PPS source
typically rely on one or more frequency upconversion steps. Maintaining
low output noise, while providing over eight orders of magnitude of
frequency scaling (1 Hz input to over 100 MHz output), is a significant
challenge. The AD9548 is able to mitigate this effect thanks to a
digital loop filter capable of bandwidths as low as 1 MHz (10 Hz to 3 Hz).
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