Hmmm ... what they have is HSPICE, which is YAS, Yet Another Spice, does all the standard things. Had a look at the features brochure, no surprises there. no extra layers of cleverness - there is nothing that LTspice, for example, couldn't do after a bit of playing around ...
Frank
Hello FAS42,
For free sotwareware LTSPICE software it is excellent, but where the good professional stuff gets ahead is that it can accept any level semiconductor models, and the simulator has less converge issues on vary complex circuits, meaning it gets to the end of the simulation without failing to finish your requested task.
For most things on this site LTSPICE will work.
For free sotwareware LTSPICE software it is excellent, but where the good professional stuff gets ahead is that it can accept any level semiconductor models, and the simulator has less converge issues on vary complex circuits, meaning it gets to the end of the simulation without failing to finish your requested task.
For most things on this site LTSPICE will work.
Does anyone has links to those schematics ? I tried to find the Parasound JC-3 on this site but no luck so far.
Thank you Mr. Danley. Valuable contribution.
For a little more elaboration on SY’s, Mr. Gegges and Mr. Danley’s drive lines, page 50 up to 64 of this:
http://www.hometheatershack.com/roomeq/REWV5_help.pdf
For a bit more on the important effect of constant phase shift that listening or measuring distance imposes upon the audio spectrum, see here:
Home - Br?el & Kj?r Sound & Vibration
Fig. 2 is very illustrative (actually, constant phase shift is responsible for altering the timbre of acoustical instruments attack with distance a lot more than h.f. absorption).
George
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I agree.
Mechanical and acoustical problems better to be dealth at their spatial environment by mechanical or acoustical means.
I disagree.
Per the above relevant posts, chances are this cleaning action (electrical EQ) will add some smelly mud.
I would leave them alone (as I do with the dirt in my lab)
I am not sure if this is what you mean, but see attached pic.
I don’t face a problem with this, and where is the fat?
George
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I understand where you are coming from. When I said material properties were not responsible, I meant (even if not clearly stating) things such as grain boundaries, oxygen content, things typically attributed as game changers. For material properties such as conductivity, permeability, permittivity, we certainly agree.
A good example would be IC's. For the exact same geometry, a foamed dielectric running a permittivity of 1.05 vs a solid teflon running about 3, the characteristic impedance of the cable changes by a factor of 1/sqr(delta), roughly 1/1.7 or 60%. This material change will indeed modify the break frequency where return currents would start to concentrate in the source IC vs 50/50 shield path sharing. This alters the loop induction topology, frequency response, and external noise pickup sensitivity. Should the amp not have a well designed rail or primary supply topology (wire layout), this can alter the transfer function as a result of internal coupling.
Another example would be the permeability of the chassis, where ground loop current path would constrict earlier due to path reactance changes.
I meant it well. I respect this man.
When he was theorizing the capacitor as a transmission line, he already had some real life indications while with Motorola. Later it seems he had some proof with the fabrication of high speed digital stuff.
And then it was you with that post
George
Fair nuff. He did do some good work. The hexfet topology used by IR and IXYS relies on a honeycomb polysilicon (not alminum nor copper) gate mesh structure to transfer the gate voltage across the chip. Because these power devices are actually hundreds of thousands of individual mosfet devices in massive parallelism, if some of them are turned on very quickly such that they try to support the full load current, they will blow. This also happens during turnoff.
I ran micro-cap 4 for a while, was not impressed by it's transient response capabilities. There is a good chance however, that the "driving" issues were being caused by the nut holding the steering wheel..
jn
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![HexFetStructure[1].jpg](/community/data/attachments/285/285063-391817da974d50293cbffbfd11f84b93.jpg)
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Is it me, or there are some posts wiped off during the last 24 hours?
I remember I’ve read kgrlee intent to comment on minimum phase but I can’t find that post today.
This too is copied and pasted!
George
I remember I’ve read kgrlee intent to comment on minimum phase but I can’t find that post today.
This too is copied and pasted!
George
It's you. Nothing from Mr. Lee has been pulled out of here recently. One comment from someone else, not technical.
I regurarly use sim software for checking digital layouts, this uses the physical layout (tracking, power planes, pre-preg and laminate thickness Er etc) in conjunction with IBIS files for the active devices to give drive strengths, lead frame parasitics etc. The engineers I work with us various spice software for the analogue side, but as far as I knew spice does not take into account the PCB layout. Do the programs mentioned do analogue and take into account PCB parasitics. The SIV (signal integrity verify, Cadstar)for digital uses transmission line calcs and 3D field solvers, do these work for analogue? or audio frequency range audio, I was under the impression that TL calcs dont?
For audio I keep MicroCap up to date. On Ver 10 now. It is more than sufficient for analog at low freq (Maybe up to 100K-1Mhz) and still be reasonably accurate to the finished product. It cost a few thousand dollars.
Synopsys has many modules that would work with Spice to make it complete for your needs. each company they bought had some aspect needed beyond Spice to make sure you get an exact and accurate finished product. They handle the whole spectrum into IC development and advanced mixed-signal development. Its a lot more than you see on the web site. You have to look deeper to get more. But for simple audio circuits to see if they work and basic parameters, it can work Ok ... IF you can get reasonably accurate device models you can trust.
The original question was - does the simple software SIM show oscillations/unstability. I say it probably does not reliably do so because of the less sophisication of just a basic circuit analysis gives. You either have to learn/know the art or use more sophisicated software.
Synopsys has many modules that would work with Spice to make it complete for your needs. each company they bought had some aspect needed beyond Spice to make sure you get an exact and accurate finished product. They handle the whole spectrum into IC development and advanced mixed-signal development. Its a lot more than you see on the web site. You have to look deeper to get more. But for simple audio circuits to see if they work and basic parameters, it can work Ok ... IF you can get reasonably accurate device models you can trust.
The original question was - does the simple software SIM show oscillations/unstability. I say it probably does not reliably do so because of the less sophisication of just a basic circuit analysis gives. You either have to learn/know the art or use more sophisicated software.
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Cheers.
Quite often IBIS models are far from perfect, requiring a bit of fettling when downloaded. The biggest problem for a lot of firms these days is costs, not only for the software but either having enough engineers to spare one to do the sims or paying for outside consultancy. We had our first few DDR interfaces sims double checked by a consultancy firm to check we were doing it right, not cheap, and when you employ people using Comsol the price sky rockets.
I've had a look at their web site, looks interesting stugg.
Thanks again.
Quite often IBIS models are far from perfect, requiring a bit of fettling when downloaded. The biggest problem for a lot of firms these days is costs, not only for the software but either having enough engineers to spare one to do the sims or paying for outside consultancy. We had our first few DDR interfaces sims double checked by a consultancy firm to check we were doing it right, not cheap, and when you employ people using Comsol the price sky rockets.
I've had a look at their web site, looks interesting stugg.
Thanks again.
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