[time-nuts] Help with TCXO

Azelio Boriani azelio.boriani at screen.it
Tue Nov 29 10:09:34 EST 2011


FPGA time interval counter? With an analog interpolator? No? Then, at most,
you will get a nS resolution. I have a 2.5nS resolution TIC with 100MHz
clock using four phases from the Xilinx DCM in a Spartan3.

On Tue, Nov 29, 2011 at 1:23 AM, Michael Malloy <mechano at gmail.com> wrote:

> Ok great thank you very much I will go get some 74HC14 today if possible
> and replace them, I will also upload a schematic, and a smaller picture
>
> i tried running on a bread board with a 4000 CMOS CD40106
> the output looked like a square wave through a diode to LP filter not
> good, like spikes
> not what I want I suspect something to do with the 4000 CMOS circuitry??
> 4000 CMOS is good because you can do cool stuff with it as it will
> work up to 15 volts or maybe more
> great for hybrid analog and digital designs, especially for audio
> applications, you can use 4000 CMOS
> to build very good VCO, but low frequencies.. if you would like a
> circuit for that
> I can give you this also if interested? I have about 6 different
> design for VCO using hybrid design like this?
>
>
> off topic I am also building a VHDL/FPGA time interval counter, I will
> be happy to share the code and the schematics if your interested
> the FPGA is great fast, and I can do all the pre scaling and down
> converting within the hardware. concurrently as you know
> downside FPGA are expensive for what they are.
>
> the TI logic design guidelines said specifically that 4000 cmos is
> good for low frequencies sub 1MHZ
> for anything above different logic families.
>
> I will get back to you all later with schematic and pictures
> thanks again for all your help.
>
> let me know if you want schematics for my other designs
>
> also forgive my ignorance and don't judge me but what is a "line-receiver"
> never heard of this is this jargon, I am australian, or is this just
> my ignorance
> remember I am a newbie to time and frequency but I am fascinated
>
>
> On Mon, Nov 28, 2011 at 10:23 PM, ehydra <ehydra at arcor.de> wrote:
> > A 50K picture should fit the problem.
> >
> > I successfully use 4000 series for amplifying a 5MHz PSK signal. The
> HEF4x
> > is a little faster than HCFx.
> >
> > Or use a line-receiver if the oscillators is not buffered internal.
> >
> > - Henry
> >
> >
> > Michael Malloy schrieb:
> >>
> >> its a shame i cannot post the picture i took is there any way to be
> >> able to send my oscilloscope picture its 800k thats the problem
> >
> > --
> > ehydra.dyndns.info
> >
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>
>
> --
> #include <sig.h>
> /* ================ */
> Michael
> /*How crazy does it get on the moon, when theres a full Earth?*/
>
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