Mike Engelhards next simulator after LTSpice...

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[Ricky]

On Wednesday, May 10, 2023 at 7:17:48 PM UTC-4, Gerhard Hoffmann wrote:

https://www.eenewseurope.com/en/re-writing-spice-for-a-digital-world/

cheers, Gerhard

Anyone understand how Qorvo is involved? I\'m not getting it.

--

Rick C.

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[John May]

On Friday, May 12, 2023 at 8:57:22 AM UTC+1, Gerhard Hoffmann wrote:

Am 12.05.23 um 04:58 schrieb John Larkin:
On Thu, 11 May 2023 21:55:27 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

On 2023-05-10 20:19, John Larkin wrote:
On Wed, 10 May 2023 17:10:15 -0700, John Larkin
jla...@highlandSNIPMEtechnology.com> wrote:

On Thu, 11 May 2023 01:17:41 +0200, Gerhard Hoffmann <dk...@arcor.de
wrote:




https://www.eenewseurope.com/en/re-writing-spice-for-a-digital-world/

cheers, Gerhard

That\'s great. LT Spice digital simulation is awful.

Free is even better. He could have sold it for big bucks, but I
suspect he\'s crazy rich already.



The real breakthrough would be if there will be Spice models for their
RF transistors.


I\'d settle for built-in support for (1) diffusive transport, e.g.
forward recovery in diodes (triple credit for modelling SRDs correctly),
and (2) plot scaling that sits still when you re-run the sim.

It can\'t know in advance how high the current is gonna go on this run!


BTW Infineon has Spice models for their SiGe parts.

So does EPC for their GaN.

I think that s-params and Smith charts and load pull data are all
relics of the graph paper and slide rule days. Spice makes so much
more sense, especially as the world gets more wideband and more
nonlinear.
No . they are not relics. Network analyzers, SmithCharts and
s-params look at a circuit from the frequency domain just as
spice, scopes and TDRs look from the time domain.

I learned Spice 2G4 on a Telefunken TR-4 computer that still
ran mostly on core memory and Ge-Transistors, the first
commercial microprogrammed machine. A 48 bit machine and its
96 bit double reals were a joy. VAX and X87 was a major step
backwards for spice. There are no longer punched cards and
output is no longer on a chain printer.

Other than that, Spice itself has not made a lot of progress,
the biggest step was the transistion from Fortran to C but
since Berkeley has left the boat - that\'s it. 30 Years?

A number of companies have sculptured their private user
interface on the spice kernel and sold the result as a new
product. p-spice, microcap, H-spice for timesharing service,
Kevin\'s Superspice. Where are they now?
They all may have made small improvements, that are headed to
the gutter. No central authority anymore that keeps things
together and forever.
NG-spice perhaps, but I cannot remember any news since years.

As nice as LTspice was, it was a disaster for further
improvements. Now with Qorvo there is at least some free
competition. Free as in free beer.

Still it cannot model carrier lifetime for PIN diodes, it
cannot do nonlinear noise analysis. Noise analysis of
a chopper amplifier? Don\'t make me laugh so hard!

Noise and frequency response is computed in Spice by linearizing
the circuit around the operating point and then doing
small signal analysis. Is that any better than using
s-parameters for 5V / 4mA right from the start?

Which is the stable operating point in a chopper amplifier,
or in an oscillator with pulse feedback in Lee-Hajimiry style
to suppress phase noise?
How does Spice compute phase noise? There\'s no harmonic balance
simulation.

Keysight ADS & Genesys and MWO have it and they have the RF
transistor design kits in their libs. And they can ask an insane
amount of money for it.

What do you call insane? Microwave office (pre ANSYS) and Silvaco SmartSpice/SmartSpice RF were under $10K not too long ago.

Even ham simulators like QUCs-Studio start to get it.
http://qucsstudio.de/de/start/

Cheers, Gerhard

 

[John S]

On 5/12/2023 2:57 PM, John May wrote:

On Friday, May 12, 2023 at 8:57:22 AM UTC+1, Gerhard Hoffmann wrote:
Am 12.05.23 um 04:58 schrieb John Larkin:
On Thu, 11 May 2023 21:55:27 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

On 2023-05-10 20:19, John Larkin wrote:
On Wed, 10 May 2023 17:10:15 -0700, John Larkin
jla...@highlandSNIPMEtechnology.com> wrote:

On Thu, 11 May 2023 01:17:41 +0200, Gerhard Hoffmann <dk...@arcor.de
wrote:




https://www.eenewseurope.com/en/re-writing-spice-for-a-digital-world/

cheers, Gerhard

That\'s great. LT Spice digital simulation is awful.

Free is even better. He could have sold it for big bucks, but I
suspect he\'s crazy rich already.



The real breakthrough would be if there will be Spice models for their
RF transistors.


I\'d settle for built-in support for (1) diffusive transport, e.g.
forward recovery in diodes (triple credit for modelling SRDs correctly),
and (2) plot scaling that sits still when you re-run the sim.

It can\'t know in advance how high the current is gonna go on this run!


BTW Infineon has Spice models for their SiGe parts.

So does EPC for their GaN.

I think that s-params and Smith charts and load pull data are all
relics of the graph paper and slide rule days. Spice makes so much
more sense, especially as the world gets more wideband and more
nonlinear.
No . they are not relics. Network analyzers, SmithCharts and
s-params look at a circuit from the frequency domain just as
spice, scopes and TDRs look from the time domain.

I learned Spice 2G4 on a Telefunken TR-4 computer that still
ran mostly on core memory and Ge-Transistors, the first
commercial microprogrammed machine. A 48 bit machine and its
96 bit double reals were a joy. VAX and X87 was a major step
backwards for spice. There are no longer punched cards and
output is no longer on a chain printer.

Other than that, Spice itself has not made a lot of progress,
the biggest step was the transistion from Fortran to C but
since Berkeley has left the boat - that\'s it. 30 Years?

A number of companies have sculptured their private user
interface on the spice kernel and sold the result as a new
product. p-spice, microcap, H-spice for timesharing service,
Kevin\'s Superspice. Where are they now?
They all may have made small improvements, that are headed to
the gutter. No central authority anymore that keeps things
together and forever.
NG-spice perhaps, but I cannot remember any news since years.

As nice as LTspice was, it was a disaster for further
improvements. Now with Qorvo there is at least some free
competition. Free as in free beer.

Still it cannot model carrier lifetime for PIN diodes, it
cannot do nonlinear noise analysis. Noise analysis of
a chopper amplifier? Don\'t make me laugh so hard!

Noise and frequency response is computed in Spice by linearizing
the circuit around the operating point and then doing
small signal analysis. Is that any better than using
s-parameters for 5V / 4mA right from the start?

Which is the stable operating point in a chopper amplifier,
or in an oscillator with pulse feedback in Lee-Hajimiry style
to suppress phase noise?
How does Spice compute phase noise? There\'s no harmonic balance
simulation.

Keysight ADS & Genesys and MWO have it and they have the RF
transistor design kits in their libs. And they can ask an insane
amount of money for it.


What do you call insane? Microwave office (pre ANSYS) and Silvaco SmartSpice/SmartSpice RF were under $10K not too long ago.

That\'s not insane?

Even ham simulators like QUCs-Studio start to get it.
http://qucsstudio.de/de/start/

Cheers, Gerhard

 

[Lasse Langwadt Christensen]

søndag den 14. maj 2023 kl. 17.23.47 UTC+2 skrev John S:

On 5/13/2023 9:50 PM, Hanno Foest wrote:
Am 14.05.23 um 01:30 schrieb John S:

BTW, should be *Englehardt\'s* in the subject.

No, the correct name is: Mike Engelhardt

https://en.wikipedia.org/wiki/LTspice
[...]
*In the subject is Englehards*. That is wrong! His name is mike
Englehardt. The possive is Englehardt\'s!
Subject may be wrong, but his name is Engelhardt and not what you say.

Hanno

Oh! I understand. Your first language is not English. Sorry.

so OP missed an \' and you can\'t spell his name

 

[John S]

On 5/14/2023 10:31 AM, Lasse Langwadt Christensen wrote:

søndag den 14. maj 2023 kl. 17.23.47 UTC+2 skrev John S:
On 5/13/2023 9:50 PM, Hanno Foest wrote:
Am 14.05.23 um 01:30 schrieb John S:

BTW, should be *Englehardt\'s* in the subject.

No, the correct name is: Mike Engelhardt

https://en.wikipedia.org/wiki/LTspice
[...]
*In the subject is Englehards*. That is wrong! His name is mike
Englehardt. The possive is Englehardt\'s!
Subject may be wrong, but his name is Engelhardt and not what you say.

Hanno

Oh! I understand. Your first language is not English. Sorry.

so OP missed an \' and you can\'t spell his name

Of course not. Please let me back out of my mistake without embarrassing
myself further. I apologize for not recognizing our cultural differences.