[time-nuts] 50 ohm Driver

Bob Camp kb8tq at n1k.org
Wed Mar 4 18:47:13 EST 2015


If you want to drive out of a 50 ohm source into your 50 ohm load *and*
get 5V into the load … that’s a fancy amp. 10V power and some careful
work to get it going. 

If you just want to get roughly 5V into a 50 ohm load, then it’s a matter of how 
many gates you decide to parallel. If you go with “32 ma” drivers, you should 
be able to get it done with 8 of them in parallel. Drive them all off of a single  
dedicated fast gate that’s on the same supply. Probably best to stuff
a 20 or 30 ohm resistor in series with each of the outputs. If it’s *got* to
be a full 5V, don’t use the resistors. 


> On Mar 4, 2015, at 5:26 AM, Martyn Smith <martyn at ptsyst.com> wrote:
> Hello,
> A quick question.
> My output driver for a simple amplifier.
> I use three gates (in parallel with resistors) from a 74AC14 to give me about 0-3.2V into 50 ohm.
> I want to have a driver that gives me a full 0-5V (at least 0-4.5V) swing into 50 ohms.
> Can anyone recommend an IC that can delivery this.
> But it needs to have similar jitter performance to the 74AC14.
> I use it up to 10 MHz.
> Best Regards
> Martyn 
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