?? Many Linux users dual-boot with Windows for the few Windows programs? without Linux equivalents (Intuit, I'm talking to you). Maybe someone who's locked into XP could try dual-booting with Linux to run LTspice and let us know how it goes.

?? Craig

On 8/7/16 4:56 PM, ricksbmw@... [LTspice] wrote:

It would seem reasonable for Mike to provide a short explanation of the technical reasons for not providing compatibility with XP (would it have been that costly?).

A significant part of the world still runs XP because the economics of replacing perfectly good hardware with something that will support 7,8, or 10. It is not a trivial expense for a good part of the world, and detractors don't seem to understand that.

Rick

While I can't speak for Mike, I can say that often such restrictions are based on the tools used to build the program. Since XP is (past) EOL, many tools don't support generating new programs for it. Since LTSpiceVII is avail for 64 bits, it likely is using a newer tool than LTSpiceIV, and that might not support XP.


--
Richard Damon

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It would seem reasonable for Mike to provide a short explanation of the technical reasons for not providing compatibility with XP (would it have been that costly?).

A significant part of the world still runs XP because the economics of replacing perfectly good hardware with something that will support 7,8, or 10. It is not a trivial expense for a good part of the world, and detractors? don't seem to understand that.

Rick

Hello

Indeed running the 64 bits makes the PWL work.

Thanks?

Hello,

How come it took two days before my message were posted?

You look for an opamp, it's not the bias current you worry because you are only measuring 200nA lowest. Any opamp with bias current less than 10nA is plenty good. The most important thing you look for is input capacitance. Most of the opamps have over 5pF of input capacitance and that will increase the noise gain. You want to understand noise gain, read the explanation in my Excel file. I explain each and every component of the noise source and the relevant frequency range. I chose LTC6268 because the input capacitance is about 0.5pF. For your requirement, some BJT input opamp might be good enough, just look for low input capacitance.

That said, you always see noise coupling into TIA circuits. I never saw a TIA circuit that dose not pick up all sort of noise.? All the noise calculation and the excel file I provided are ONLY for ideal theoretical noise limit. If you leave the bare circuit, you will see all the noise from around the surrounding.

FYI, our contractor designed another TIA that has only a 1M feedback resistor and it pick up all sort of noise. We have to re-layout the board to put in the shield. A ground plane is an absolute MUST. The other reason is people have long trace at the -ve input. That will pickup noise every time. Layout is everything. This is beyond the scope of this forum. Circuit is always simple, it's the layout and shielding. You need to look at your layout, put in the shielding, then talk more about it. LTSpice is NOT the place to talk about this, go to some electronic forum and ask question. I feel I already way out of bound here already.

You are only working with 50K feedback resistors. My circuit use 250M, and I designed with up to 2G resistors TIA circuits. Layout and shielding become the number one design. If you read my other post, 50K resistor will give you output range of 10mV to 5V( fit your 5V supply requirement). This is very easy signal to deal with. We deal with a lot lower signal successfully.

Hi

My simulation was created in LT spice IV and works top notch in this software.
When I open it in LT spice XVII, it bugs cause of the PWL file bug.

Hello,

Hello Alainstas141

You wrote :
"

PWL file in LTSPICE XVII not working while working in LT spice IV"

Does it mean you create an asc file in LTspice XVII and then try to use it in LTspiceiV ?

Regards

PhB

Hi Helmut


But when I try to install the 64 bit version, it installs the 32 bit. Don't know why? I made it several times but keep? receiving the same bug.

I did send a message to help address.

It's really a pity: this software seemed flawless up tyo now. I think I 'm going to continue to use LT spice IV

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Hello,

This problem only happens with LTspiceXVII(x86), the 32 bit version.
I have reported this problem more than two weeks ago.

Please use the 64 bit version of LTspiceXVII. This version runs with PWL sources.

Maybe you should also send a bug message to the email address given in the? Help->About of the program.

Best regards,
Helmut

Hello
LT spice? XVII displays the following cumbersome message in a simulation involving a voltage PWL file:

"trouble stat()'ing PWL file "? (SIC)

the simulation works perfectly in LT spice IV, which reads the PWL file the right way.

I tried several files and they all fail.

Any hint to solve this . Thanks

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