Not sure if it's already been mentioned, but Linear has introduced a
new part that looks interesting :
LTC6957 Low Phase Noise Buffer/Driver
http://www.linear.com/product/LTC6957-1
From the product blurb:
"
"The LTC6957 will buffer and distribute any logic signal with minimal
additive noise,
"however, the part really excels at translating sine wave signals to
logic levels.
"The early amplifier stages have selectable lowpass filtering to
minimize the noise
"while still amplifying the signal to increase its slew rate. This
input stage filtering/noise
"limiting is especially helpful in delivering the lowest possible phase
noise signal
"with slow slewing input signals such as a typical 10MHz sine wave
system
"
-Brian
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