On Tue, Feb 23, 2021 at 11:26 PM, Vlad wrote:

I remember this from LTspice IV days, but it never bothered me. I
suppose it posed no interest at the time, and in time I just learned
to accept it. I guess I'm a believer now.

Thanks, I thought it might be just me.
After all,?this is not important because the added inclined edges don't pose a problem, speaking practically.

But being a programmer, I was just curious about the hidden phantom code in the program (LTspice IV) that?insists to also generate these added edges and give them?different rise and fall times.

Kerim

Hello Tony

For better or worse, it looks like plotting waveforms with @1 or @2
doesn't work right, but selecting them from the View > Select Steps
menu does. Changing the plotwinsize option to make the timesteps
smaller helps minimize the appearance of the problem, but it does not
actually fix it.

It's strange, I use the @1, @2, etc. notation all the time and I very
rarely see artefacts. It's essential when you need to use this feature
in waveform arithmetic.

I remember this from LTspice IV days, but it never bothered me. I
suppose it posed no interest at the time, and in time I just learned
to accept it. I guess I'm a believer now.

--
Vlad
______________________
ltspicegoodies.ltwiki.org v2:
quite universal analog/digital filter,
power electronics, signal processing,
easy to work with math functions,
digital models, and rants.

Hello Andy

Thanks. I remember experimenting with it to see if they were also affected,
but that was a long time ago.

Well I had forgotten about flat(), but seeing it triggered the right memory.

--
Vlad
______________________
ltspicegoodies.ltwiki.org v2:
quite universal analog/digital filter,
power electronics, signal processing,
easy to work with math functions,
digital models, and rants.

If it's for simulation, you can probably use the UniversalOpamp2.

Andy

开云体育

Check APEX Microtechnology. They make several that meet those requirements and have simulation models for most.

Dave

Hi,

I am looking for an Op-amp with these descriptions.?

I would really appreciate it if you help me find a proper model.

200 V
3~30KHz

-- 
David A. Wayne                                                AA7DW
Desert Microtechnology Associates, Inc. ? IC Design and Technology
16611 N. 91st Street, Suite 103             Analog and Mixed-Signal
Scottsdale, AZ  85260  USA                    CMOS, Bipolar, BiCMOS
Ph: 480-515-0005 x101         Cell: 602-793-4440

Hi,

I am looking for an Op-amp with these descriptions.?

I would really appreciate it if you help me find a proper model.

200 V
3~30KHz

Here is one more suggestion, which I'm putting here because it might help everyone.

In Grroups.io, when you see a button to "Leave Group", it means to permanently leave the group = unsubscribe from the group.? Do not click that button unless you really want to unsubscribe from the group.

If you are done for the moment and want to move on to something else, that is NOT the button to click.? You don't need to click anything.

Andy

Tony,?

I agree.

Shame that the current On-Semi data does not provide an I-V plane plot.?

All that said, however, a circle back to small signal data set is still useful and unfortunate in many cases
that will require further measurements.?

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On 23/02/2021 15:44, alan victor wrote:

While many devices do not have S, they do have other parameter sets, h or y, ?and that requires conversion to S. Finally direct measure of S may be required.?For the case of the 3904, either measure the S directly or use h parameters and convert to S. Some y parameters exist for the 3904 as well and the same process, conversion to S is required. At that point, ?with an available non linear model, the comparison to measured as well converted to S data is needed before one can trust a non linear model.?

Instances exist where no model is available, either linear or non linear. Then measured data is required. Stated previously, beginning with S measured data does provide a gateway to a reasonable first pass approach to a non linear design.

I admire your dedication to S-parameters, but I can't help thinking going via Y-parameters (which are rarely given in modern datasheets) is more work than deriving from scratch a half-decent SPICE model directly from the datasheet. For example, the current On-Semi (was Fairchild) 2N3904 provides almost everything needed except an Ic vs. Vce plot. It even has some H-parameter graphs, but unfortunately magnitude only at 1kHz (except Hfe) , so not that useful.

-- 
Regards,
Tony

Andy,

I'll be glad to share data.

As my time permits I will search for what I have and post. This was done quite some time ago.

Many of the files are on a HP Winchester CS 80? drive which was connected to a workstation and analyzer. So recovery and assembly?
of the data takes some doing.

Have a great day.?

Alan,

So, I guess you are unwilling to part with the 2N3904 data?

Why didn't you just say this?

Andy

Michael, let's take this discussion offline.

Please send further communications to the LTspice+owner email address.

Whatever you keep doing when you login to your account, you need to stop doing that.? Otherwise, I'm going to conclude that your only purpose is to annoy us and you don't deserve to be a member of this group.

Andy

Michael, your Groups.io account has no Bounces.? I guess you are receiving Bounces for another account that you didn't tell us about.

Andy

Ok, changed the password for Preh.de address.
(I am using chrome now, before it was edge or IE)

The Yahoo address is also mine for private use.

The Micron address is not mine and never was.

The *...*@w*...*.de I talked about was my error.
The *...*@p*...*.de was to obfuscate my Preh.de address (what Andy reviled).
So I "only" have 2 addresses.

Michael, stop unsubscribing yourself!

Whatever you are doing on the web, logged in to Groups.io, you are unsubscribing yourself.? Stop doing that!

? ? "I guess I need help from mail admin of Groups.io.
? ? ?What do you think?"

I doubt it.? They probably won't tell you anything we haven't already told you.? Whatever it is that you're doing, you need to stop doing it.? There is line after line of "haubmi1 <M*@*.De> left via web".? The only two ways this can happen are:

(1)? You did it.? Or,
(2)? Someone else knows your password, and logged in as you, and did it.? That's why I said to change your password NOW.

Andy

Michael,

You wrote that your gateway always bounces the first message from unknown mail servers.? IMO, this is a really BAD idea.? But anyway, it shouldn't matter, because by now your gateway knows about Groups.io (you have been receiving their messages for many months), so no more messages would be bounced.

When a message from Groups.io bounces, it registers as a "bounce" and does not unsubscribe you.? Bounces are tracked separately.? I see that you have no "bounce" messages any time in the last several months, so anyway that is not happening.

The changes to your Groups.io account are happening because someone (you?) is logging into your Groups.io account and making changes.

PLEASE DO THIS -->? Login to your Groups.io account now, and CHANGE YOUR PASSWORD ASAP.? Just in case someone else knows your password and is making changes on your behalf.

I guess maybe you have 4 accounts on Groups.io?? At least 3.? I don't know what the other *@*.de one is.? I guess that's the one you use for private email, not the one you're using now.

Andy

On 2/23/21 10:13 AM, haubmi1 via groups.io wrote:

I have seen parts of the logs of our mail gateway.
And I suspect following scenario:

-> from: [email protected] <mailto:[email protected]>
Our gateway bounces because unknown sender (but passed after 10
minutes, I see always one message passing through).
-> resend from: [email protected] <mailto:[email protected]>
Again bounced, because unknown sender.
-> resend from: [email protected]
<mailto:[email protected]>
Again bounced, because unknown sender.
-> resend from: _bounce+number+number+number@...
<mailto:[email protected]>
Again bounced, because unknown sender.
-> resend from: _bounce+number+number+number+number@...
<mailto:[email protected]>
Groups.io server gives up, resets subscription to Summary and sends
the unsubscribed message.

I also see some from: [email protected]
<mailto:[email protected]>.

I guess I need help from mail admin of Groups.io.
What do you think?

If as you show, groups.io keeps changing the sending email address, it
WILL have problems with some receiving email systems, at a minimum, it
should retry with the same address that it used the first time, or
'grey-listing' will be a major problem.

The receiving side can help with this by 'white-listing' groups.io and
not grey listing it.

--
Richard Damon

Hi Andy,?

Yes, allows conversion to S. As far as the 3904, the data I have I measured from a variety of manufacturers.?
The conversion from manufactured y or h and a comparison to measured S of the same device in some cases is quite good and in others, not so.

Regards,?
Alan

Michael,

The reason why your subscription is Daily Summary again, is because you unsubscribed and re-subscribed yourself, AFTER Tony made those changes.

Stop doing that!

You are set (again) to receive individual messages.? Don't change anything!? Leave it alone.? Don't touch your account.? Leave it alone.

Andy

I have seen parts of the logs of our mail gateway.
And I suspect following scenario:

-> from: [email protected]
Our gateway bounces because unknown sender (but passed after 10 minutes, I see always one message passing through).
-> resend from: [email protected]
Again bounced, because unknown sender.
-> resend from: [email protected]
Again bounced, because unknown sender.
-> resend from: [email protected]
Again bounced, because unknown sender.
-> resend from: [email protected]
Groups.io server gives up, resets subscription to Summary and sends the unsubscribed message.

I also see some from: [email protected].

I guess I need help from mail admin of Groups.io.
What do you think?