Re: RF Drive from digital OSC...

On Tue, 02 Oct 2007 07:41:07 -0700, Dave <dnyberg2@xxxxxxxxxxxxx>
wrote:

I am using a small SMT OSC module at 100 MHz that has good harmonics
to ~400 MHz to drive several sources on a board I have designed. I
need the output to be capable of driving a couple of 50 ohm loads to 0
dB. I cant find anything that will take a 3.3V CMOS CLK input that
can drive a pair of outputs into a 50 ohm load that will preserve the
harmonics fairly well. Ideally, I was looking for a single IC that
could do this, even if it was one channel... I could use two of
them. Any solution has to have a minimum of parts and be very cost
effective, in the dollars range. Any help would be great! By the
way, I can find plenty of LVDS differential drivers that can do the
job nicely into 50 ohms, but I don't know how to "single end" a
differential output without a transformer that I'm not allowed to even
suggest, and most of them require a differential drive, which I do not
have.

Many thanks!


Most of the LVDS-to-CMOS receivers have screaming fast outputs,
sub-ns. Bias one input maybe a volt off ground, and drive the other
single-ended.

I also like the NL37WZ16 triple buffer, with all sections in parallel.
It will go nearly r-r into 50 ohms, with roughly 600 ps edges. The
downside is the terrible US8 package. We're paying 26 cents. There's a
schmitt version, too.

John

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