TI FilterPro is a mess

TI filterpro 2.0 works well, if you don't ask for too much. It gets the pole locations and Q right; and this is sufficient to build basic filters by hand. The topologies and the component values suggested by FilterPro aren't optimal; there could be better options. Don't know how could you get divide by zero errors though.

Yes. That filterpro 3.x is absolute crap.

There is a basic filter design program from Microchip also. It has similar capabilities as the FilterPro 2.0.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

Take a look at FilterWiz from Schematica . The download will run in demo mode (some values masked) and the whole thing is pretty inexpensive.

Disclaimer: I'm mostly The Software Guy on the team but I can usually find the cathode on a resistor. (joking, for the humor impaired)

Luckily, 2.0 is still here on my PC, and it still works. You do have to be careful in the sequence you click things, to avoid the n/0 error, or to keep things from being greyed out in funny places. And it doesn't understand 1.3e6 form numeric entries!

John

Takes some getting used too, but then I haven't used a lot of EDA programs.

Huh? Does 2nd order, little drop down box to set that, but it's out of sequence on the page presentation... Wizard? Not!

Works fine here, on Win7 x64. Only thing is it is odd about component values, but I used a different program to check them. Couldn't find much else on the 'net for free.

Yup!

Didn't work for me. I can't remember what it did, something so useless I uninstalled it straight away.

Hey, that warning's timely--I was just about to download it. Thanks for the wave-off.

James Arthur

Well, it's free and doesn't seem to do a lot of harm. Just be aware of the .NET nonsense.

It may be OK for general filter design, but it annoyed me that it won't do the custom-Q case I need, something that V2 used to do.

Looks like the LTC thing hasn't been maintained in a decade or so.

The AADE guy has a free filter program. Haven't tried it.

We do have the fancy NuHertz passive filter designer, which is astonishing, but it's dongled and I didn't have the dongle at home when I was working on the current circuit. And I'm doing active anyhow.

I guess I'll have to write some PowerBasic to do this special case for me. Nuisance.

John

"John Larkin" schreef in bericht news: snipped-for-privacy@4ax.com...

For the simple filters I needed (so far) I used

I tried TI FilterPro Desktop 3.0 but it did not work out.

petrus bitbyter

That's more than enough wave-off for me. I don't do airport scanners, and I don't do .NET (bloatware).

Cheers, James Arthur

I downloaded FP3 several months ago (a year?). Even though all that .net crap is already on my system (IT folks load them down with all sorts of bloat), I don't like it. I didn't delete FP2 and us it, mostly. The two versions don't bother each other.

John Larkin expounded in news: snipped-for-privacy@4ax.com:

The only thing I don't like about LTspice is the fact that I have to manually (or scripted) add the models I use back into the basic product. For example I need the TI opamps and the MPF102 JFET (and other transistors). If I do an "update", then my tweaked copies of the LT library files need to be "re- tweaked" to put back my own additions.

Maybe there's a better way to add my parts without messin' with the existing LT library files?

Nope.

Warren

Sounds like it was "upgraded" by glittery script kiddies. Dragging in .NET (without any real effect to boot) is a byproduct of the tools used.

Yes. Limited to simple-minded structures. ...Jim Thompson

-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Remember: Once you go over the hill, you pick up speed

LT Spice isn't supposed to mess with models added to the libraries. Sync is

Thompson has killfiled me but carries on conversations with me through intermediaries. How strange.

John

snipped-for-privacy@att.bizzzzzzzzzzzz expounded in news: snipped-for-privacy@4ax.com:

I just tried it again on my corporate laptop and my added components seem to have survived ok. The files they were in were indeed updated.

So my other experience must have been late night user error. Which is good then, as that is much more convenient.

Ya, that's rather obvious.

Warren

That's good news. I've just started using LT Spice and hadn't tried this myself yet but this was one of the things they covered in the "importing other models into LT Spice" section of the "2011 LT Spice World Tour".

It is, unless the first part doesn't work. ;-)

I went to that seminar here in Dallas last Friday. It is my third year to do attend and I learn new and useful things every time.

John

I went to the Atlanta one. It was good, but I was there to learn LT Spice.

other

In their defense, they make the switcher ICs and want to sell them. But, you know that. It also made a topic for examples.

One of the things Mike mentioned was slope compensation. I think I understand it, but to really solidify the idea in my head, I want to use simulation to peek at the causes.

AFAIK, they do it every year. I'll keep going until it begins to bore me, but I doubt that it ever will.