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'[EE]: Matched Inverter and Buffer'
2002\08\24@010056 by Donovan Parks

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Hello,

I have a PWM signal and I need to use both the original singal and the inverse of the signal.  Now, putting the signal through an inverter causes a small time delay leaving the two signals to not be exactly 180 degree out of phase.  I imagine this is a common problem and suspect an inverter with matched buffer IC exists that allows you to reduce this error.  Does such an IC exist? Can anyone give me a part number? (I was suprised to find my search of Digikey turn up nothing, but I'm not sure exactly what to search for)  
Thanks,
Donovan

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2002\08\24@011223 by Brent Brown

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Have a look at the TC4428A MOSFET driver which has one inverting and
one non-inverting driver. Even Microchip make them!

www.microchip.com/1010/pline/analog/anicateg/power/pwrmang/mosf
et/tc4_46/tc4428a/

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2002\08\24@060938 by Peter L. Peres

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The normal wat to do it is to use an inverting and a non-inverting buffer
and to use an adjustable delay at the input of one of them. The edges will
never be perfectly synchronous no matter what you do. You need to
determine a level of precision you need and implement something that
achieves it.

Peter

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2002\08\24@094504 by Rick C.

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You didn't state how much delay you are getting and how much you can tolerate. If you use a fast logic device, you can probably achieve your goal. I believe 74Sxx or 74Hxx device should suffice. If you need closer to zero delay, feed your source through an inverting gate and a non-inverting gate which should give you satisfactory results.
Rick

Donovan Parks wrote:

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2002\08\24@161357 by Donovan Parks

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Hello,

Does one typically just use an RC circuit to implement an "adjustable
delay"?

Thanks,
Donovan


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2002\08\24@161547 by Donovan Parks

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Hello,

Feeding my source through an inverting gate and a non-inverting gate is
exactly what I hope to do.  What I am wondering is if you can buy an IC that
contains both an inverting gate and a non-inverting gate or if I need to use
to different IC's and try and match their delays (or build an adjustable
delay circuit).  Brent Brown (thanks!) pointed me to the TC4428A - do you
know another IC?

Donovan


> You didn't state how much delay you are getting and how much you can
tolerate. If you use a fast logic device, you can probably achieve your
goal. I believe 74Sxx or 74Hxx device should suffice. If you need closer to
zero delay, feed your source through an inverting gate and a non-inverting
gate which should give you satisfactory results.
> Rick
>
> Donovan Parks wrote:
>
> > Hello,
> >
> > I have a PWM signal and I need to use both the original singal and the
inverse of the signal.  Now, putting the signal through an inverter causes a
small time delay leaving the two signals to not be exactly 180 degree out of
phase.  I imagine this is a common problem and suspect an inverter with
matched buffer IC exists that allows you to reduce this error.  Does such an
IC exist? Can anyone give me a part number? (I was suprised to find my
search of Digikey turn up nothing, but I'm not sure exactly what to search
for)
{Quote hidden}

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2002\08\24@171537 by Dave Tweed

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Donovan Parks <RemoveMEdparksspamTakeThisOuTUVIC.CA> wrote:
> Feeding my source through an inverting gate and a non-inverting gate is
> exactly what I hope to do.  What I am wondering is if you can buy an IC that
> contains both an inverting gate and a non-inverting gate or if I need to use
> to different IC's and try and match their delays (or build an adjustable
> delay circuit).  Brent Brown (thanks!) pointed me to the TC4428A - do you
> know another IC?

Pretty much any RS-422/RS-485 driver should do exactly what you want.
There are older products like the National DS8921/8922 or newer stuff
like the Maxim MAX3485 (this particular part has no slew-rate limiting,
which may be important for you).

-- Dave Tweed

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2002\08\24@195553 by Matt Pobursky

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On Sat, 24 Aug 2002 12:44:03 -0700, Donovan Parks wrote:
>Hello,
>
>Feeding my source through an inverting gate and a non-inverting gate
>is exactly what I hope to do.  What I am wondering is if you can buy
>an IC that contains both an inverting gate and a non-inverting gate or
> if I need to use to different IC's and try and match their delays (or
> build an adjustable delay circuit).  Brent Brown (thanks!) pointed me
> to the TC4428A - do you know another IC?

Use a quad two input XOR (74HC86 or similar) gate package -- use two
gates, connect your input signal to one input of each gate. Connect a
logic '1' (+V) to the other pin of one gate and logic '0' (ground) to
the other pin of the second gate.

You now have an inverted signal on the output of gate with a logic '1'
on the input and a non-inverted signal on the output of the gate with a
logic '0' on the input.

The delay will be the same (or very very close) for both signals. XOR
gates make great switchable inverters, dirt cheap too! ;-)

Matt Pobursky
Maximum Performance Systems

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2002\08\25@142323 by Peter L. Peres

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On Sat, 24 Aug 2002, Dave Tweed wrote:

>Donovan Parks <RemoveMEdparksEraseMEspamEraseMEUVIC.CA> wrote:
>> Feeding my source through an inverting gate and a non-inverting gate is
>> exactly what I hope to do.  What I am wondering is if you can buy an IC that
>> contains both an inverting gate and a non-inverting gate or if I need to use
>> to different IC's and try and match their delays (or build an adjustable
>> delay circuit).  Brent Brown (thanks!) pointed me to the TC4428A - do you
>> know another IC?
>
>Pretty much any RS-422/RS-485 driver should do exactly what you want.
>There are older products like the National DS8921/8922 or newer stuff
>like the Maxim MAX3485 (this particular part has no slew-rate limiting,
>which may be important for you).

Good idea. I like this. Although he did not say how fast his pwm is.

Peter

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2002\08\25@142406 by Peter L. Peres

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On Sat, 24 Aug 2002, Donovan Parks wrote:

>Hello,
>
>Does one typically just use an RC circuit to implement an "adjustable
>delay"?

Yes, or a ready made delay line. These were common in DRAM days (discrete
dram, not simms). It's a 16 pin dil package with a delay inside, tapped
every 20nsec or so. You pick the output you need.

The TAxxxx driver may make your day because all other solutions (involving
gates) have different Tp for inverting and noninverting gates. So you'll
need a delay as above.

You really have to set a goal and try to reach it. How 'exactly' must the
edges match ?

Peter

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2002\08\25@143410 by Donovan Parks

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Thanks to everyone for helping me out.  I like Matt's solution given below
and will give it a try.  Frankly, I'm not sure "how close" I need the
signals to match so I'll see if this works.

Regards,
Donovan



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