Good Find, CD4007 Spice Model Library....

You must have an *exceedingly* copious library of spice models by now, Jim?

Plus all the behavioral models I've rolled myself, probably also in the hundreds ;-) ...Jim Thompson

Thanks Jim, very versatile chip that has saved my bacon more than once.

piglet

I'm studying the pin out to see if it's a viable device to use for a translator for conventional logic levels up to 15V swings.

Watch this space ;-) ...Jim Thompson

After 49 years, we finally get models!

I often use opamps as level translators. At lower voltages, LVDS line receivers.

From your own empirical results, or constructed from datasheets?

Both.

Specific part numbers mostly from datasheets, although paying customers usually provide netlists of the real deal, plus lab-quality data.

Plus I have tons of functional blocks which aid me in both device _and_ system modeling:

Like the most recent, hysteresis without feedback. Those who squawk that it _requires_ a latch haven't looked at a B-H curve recently... show me the "snap" (except, of course, those cores designed as memory elements, and their "snap" is still soft if you look close-up and personal ;-) ...Jim Thompson

Looks like I can make a pair of CD4007's work.

Maybe later today. I'm still in the throes of the side-effects that occur _after_ the chemo is done, like itchy hives and diarrhea :-(

I like LVDS... I've designed a few such chips. ...Jim Thompson

Fun :( FWIW it's spelt dire rear.

NT

The protection diodes are wired so that those swings wouldn't be compatible with low PS voltages. The 4049 and 4050 would be a more usual solution (no positive-rail clamp on inputs).

{>:-} ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

I'm looking for work... see my website.

Thinking outside the box...producing elegant & economic solutions.

I did a doubling level shifter (5V in to 10V out) way back, but it used a flying capacitor. Being a monolithic designer I guess you'll find ways to do it all silicon :)

piglet

Sorry if this has already been covered, Jim, but you used to be a confirmed pspice user, and exclusively so, IIRC. Then you dabbled around with ltspice and again, IIRC, quite liked it (with certain reservations). Which of these two are you mainly using these days and are there any big differences in the way each handles imported 'foreign' models?

In my 4007 voltage doubling level shifter the chip's Vdd rail was not connected to any system rails but self generated higher voltage.

piglet

I'm still a died-in-the-wool PSpice user.

I've dabbled with LTspice only because some of my clients wanted to "play along" during their chip design.

Those who simply simulated my .CIR file got excellent correlation.

Those that chose to "draw" their own schematic got overly optimistic results.

I mused for sometime over how Mike Engelhardt bragged about his speed advantage over PSpice and every other simulator.

I went to one of his seminars and he touted over and over that his technique of a special "compiling" of the netlist gave him the advantage.

Then it dawned. His "compiling" is going in and replacing every recognizable "standard" part in the netlist with idealized equivalents. Thus the speed "improvement".

You can see his speed advantage fall apart if you feed LTspice with only components not native to LTspice.

The absence of the Berkeley-Spice-standard .OUT file in LTspice confirms my suspicions... that would list the actual circuit simulated along with all the model data, operating points, etc, the whole shebang.

As for model handling... any Berkeley-Spice-standard model should work in LTspice (if not encrypted).

(The only way to avoid LTspice "compiling" is to run from another schematic-capture-generated .CIR/.NET. If you run from a .ASC you get the "treatment".) ...Jim Thompson

See "CD4007_Logic_Level_Shifter.zip" on the S.E.D/Schematics Page of my website.

Had the original CD4007 designer been more free and not tied gates together, it could be done without the resistors. ...Jim Thompson

Oh boy. Well, I guess Mike in his own defence would simply say he'd refund you every single cent you paid for it. ;-) I hope Mike's not reading this, btw, as from the exchanges I've had with him from time to time in the past, he doesn't like this kind of thing being openly discussed in a public forum (not surprisingly).

Having met him face-to-face over lunch at one of his seminars a few years back, I'd rank Mike Engelhardt as a first class narcissistic pompous ass... and I'm being kind >:-} ...Jim Thompson

What are you bloviating about?

See...

Message-ID: ...Jim Thompson