[time-nuts] minimalist sine to square

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Jan 19 18:13:26 EST 2018


A fast DIP comparator such as an LT1016 should work but it won't perform well without an effective ground plane.

If a CMOS gate is used then a low Q LC impedance step up network or equivalent will be needed to increase the signal swing at the gate input. Add a couple of schottky diode clamps for overvoltage clamping (internal CMOS gate clamp devices usually degrade performance if they conduct).


Bruce

> 
>     On 20 January 2018 at 11:40 Tom Van Baak <tvb at LeapSecond.com> wrote:
> 
>         > > 
> >         Tom
> >         What's the input signal amplitude?
> >         What's the desired output signal (eg 5V CMOS, 3.3V CMOS etc)?
> >         Bruce
> > 
> >     > 
>     It's for a typical 5 or 10 MHz OCXO / Rb / Cs with sinewave output; say, 1 Vpp. The output should be 3.3 or 5 V depending on what the MCU needs. It doesn't have to have stunning performance: think breadboard, PIC, Arduino sort of stuff. I was looking for something in a PDIP-8 package; the same as all the picDIV or picPET chips I use. That's why older parts like µA9637 / DS9637 came to mind.
> 
>     /tvb
> 
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