a question about PSPICE multiple variables simulation

Aug 4, 2005

hi,all

I want to simulate an register and another potentionometer in the same
schematic.
When the pot changes, the register's value will change too. I couldn't
express the relation in formal equations so I must use arbitrary value
pairs for the pot and the register.

How can I simulate this in pSpice? I use ORCAD/pSpice 9.1.

I can use parametric simulation but I can only simulate single
variable, e.g. a potentionometer. I know I need to write some codes but
i have no clue. Anybody could do me a favor or give me some examples
I'd appreciate that.

Thanks.

Jim Thompson · Aug 4, 2005

On 4 Aug 2005 01:06:04 -0700, leelsuc@yahoo.com wrote:

hi,all

I want to simulate an register and another potentionometer in the same
schematic.
When the pot changes, the register's value will change too. I couldn't
express the relation in formal equations so I must use arbitrary value
pairs for the pot and the register.

How can I simulate this in pSpice? I use ORCAD/pSpice 9.1.

I can use parametric simulation but I can only simulate single
variable, e.g. a potentionometer. I know I need to write some codes but
i have no clue. Anybody could do me a favor or give me some examples
I'd appreciate that.

Thanks.

Use a single parameter, say .PARAM Counter = 1, then step it to N in
increments of 1.

Express your register and potentiometer as TABLE functions of
"Counter"

THIS IS A MAJOR FLAW IN PSPICE, Charlie!!

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice

480)460-2350 | |
| E-mail Address at Website Fax

Kevin Aylward · Aug 4, 2005

Jim Thompson wrote:

On 4 Aug 2005 01:06:04 -0700, leelsuc@yahoo.com wrote:

hi,all

I want to simulate an register and another potentionometer in the
same schematic.
When the pot changes, the register's value will change too. I
couldn't express the relation in formal equations so I must use
arbitrary value pairs for the pot and the register.

How can I simulate this in pSpice? I use ORCAD/pSpice 9.1.

I can use parametric simulation but I can only simulate single
variable, e.g. a potentionometer. I know I need to write some codes
but i have no clue. Anybody could do me a favor or give me some
examples I'd appreciate that.

Thanks.

Use a single parameter, say .PARAM Counter = 1, then step it to N in
increments of 1.

Express your register and potentiometer as TABLE functions of
"Counter"

THIS IS A MAJOR FLAW IN PSPICE, Charlie!!

Indeed. It gives me the opportunity to point out that in SuperSpice you
can go:

R1: 10k 3k 8k
C2: 1n 2n 5n 6n
L1: 5u 7u 10u

and SS will run every combination of all the values and plot them all in
one go!

Kevin Aylward
informationEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

Aug 4, 2005

Hi,

I have to learn a new software....

I also want to use ORCAD optimizer function to get better performance.
Dear Jim, could you please write a simple code for me to follow? e.g.
two pots in a closed-loop circuit. Thank you in advance.

I know they upgrade pSpice with a "parametric plotter" in ver. 10.X,
but mine is v9.2.

thanksthanks t t t
h h h h h
a athanksa a a
n n n n
k k k k k
s s s s s

Kevin Aylward wrote:

Jim Thompson wrote:
On 4 Aug 2005 01:06:04 -0700, leelsuc@yahoo.com wrote:

hi,all

I want to simulate an register and another potentionometer in the
same schematic.
When the pot changes, the register's value will change too. I
couldn't express the relation in formal equations so I must use
arbitrary value pairs for the pot and the register.

How can I simulate this in pSpice? I use ORCAD/pSpice 9.1.

I can use parametric simulation but I can only simulate single
variable, e.g. a potentionometer. I know I need to write some codes
but i have no clue. Anybody could do me a favor or give me some
examples I'd appreciate that.

Thanks.

Use a single parameter, say .PARAM Counter = 1, then step it to N in
increments of 1.

Express your register and potentiometer as TABLE functions of
"Counter"

THIS IS A MAJOR FLAW IN PSPICE, Charlie!!

Indeed. It gives me the opportunity to point out that in SuperSpice you
can go:

R1: 10k 3k 8k
C2: 1n 2n 5n 6n
L1: 5u 7u 10u

and SS will run every combination of all the values and plot them all in
one go!

Kevin Aylward
informationEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

Charlie Edmondson · Aug 4, 2005

Jim Thompson wrote:

On 4 Aug 2005 01:06:04 -0700, leelsuc@yahoo.com wrote:

hi,all

I want to simulate an register and another potentionometer in the same
schematic.
When the pot changes, the register's value will change too. I couldn't
express the relation in formal equations so I must use arbitrary value
pairs for the pot and the register.

How can I simulate this in pSpice? I use ORCAD/pSpice 9.1.

I can use parametric simulation but I can only simulate single
variable, e.g. a potentionometer. I know I need to write some codes but
i have no clue. Anybody could do me a favor or give me some examples
I'd appreciate that.

Thanks.

Use a single parameter, say .PARAM Counter = 1, then step it to N in
increments of 1.

Express your register and potentiometer as TABLE functions of
"Counter"

THIS IS A MAJOR FLAW IN PSPICE, Charlie!!

...Jim Thompson
Well, if he needed to have these guys vary independently, then he can

use Advanced Analysis, and do a multi-parameter simulation. (I know you
haven't played with this, Jim, since it is sorta hard to do from
Schematics. There have to be a FEW advantages for using Capture and
Concept...

) However, in this case, they need to be linked, since
the pot value and the register value are linked, so he needs to just
have a defined relationship. I have often had a single parameter
defined in a PARAM, and have the second defined as an expression. Since
this is a register/counter/pot relationship, this implies an analog to
digital conversion, tricky in an expression. I would probably build in
a circuit to do the ADC for me, or DAC if setting the register made more
sense.

Charlie

Jim Thompson · Aug 4, 2005

On Thu, 04 Aug 2005 13:02:09 -0700, Charlie Edmondson
<edmondson@ieee.org> wrote:

Jim Thompson wrote:
On 4 Aug 2005 01:06:04 -0700, leelsuc@yahoo.com wrote:

hi,all

I want to simulate an register and another potentionometer in the same
schematic.
When the pot changes, the register's value will change too. I couldn't
express the relation in formal equations so I must use arbitrary value
pairs for the pot and the register.

How can I simulate this in pSpice? I use ORCAD/pSpice 9.1.

I can use parametric simulation but I can only simulate single
variable, e.g. a potentionometer. I know I need to write some codes but
i have no clue. Anybody could do me a favor or give me some examples
I'd appreciate that.

Thanks.

Use a single parameter, say .PARAM Counter = 1, then step it to N in
increments of 1.

Express your register and potentiometer as TABLE functions of
"Counter"

THIS IS A MAJOR FLAW IN PSPICE, Charlie!!

...Jim Thompson
Well, if he needed to have these guys vary independently, then he can
use Advanced Analysis, and do a multi-parameter simulation. (I know you
haven't played with this, Jim, since it is sorta hard to do from
Schematics. There have to be a FEW advantages for using Capture and
Concept... ) However, in this case, they need to be linked, since
the pot value and the register value are linked, so he needs to just
have a defined relationship. I have often had a single parameter
defined in a PARAM, and have the second defined as an expression. Since
this is a register/counter/pot relationship, this implies an analog to
digital conversion, tricky in an expression. I would probably build in
a circuit to do the ADC for me, or DAC if setting the register made more
sense.

Charlie

480)460-2350 | |
| E-mail Address at Website Fax

Jim Thompson · Aug 4, 2005

On 4 Aug 2005 12:45:01 -0700, leelsuc@yahoo.com wrote:

Hi,

I have to learn a new software....
I also want to use ORCAD optimizer function to get better performance.
Dear Jim, could you please write a simple code for me to follow? e.g.
two pots in a closed-loop circuit. Thank you in advance.

I know they upgrade pSpice with a "parametric plotter" in ver. 10.X,
but mine is v9.2.

thanksthanks t t t
h h h h h
a athanksa a a
n n n n
k k k k k
s s s s s

[snip]

480)460-2350 | |
| E-mail Address at Website Fax

Kevin Aylward · Aug 5, 2005

Charlie Edmondson wrote:

Jim Thompson wrote:
On 4 Aug 2005 01:06:04 -0700, leelsuc@yahoo.com wrote:

hi,all

I want to simulate an register and another potentionometer in the
same schematic.
When the pot changes, the register's value will change too. I
couldn't express the relation in formal equations so I must use
arbitrary value pairs for the pot and the register.

How can I simulate this in pSpice? I use ORCAD/pSpice 9.1.

I can use parametric simulation but I can only simulate single
variable, e.g. a potentionometer. I know I need to write some codes
but i have no clue. Anybody could do me a favor or give me some
examples I'd appreciate that.

Thanks.

Use a single parameter, say .PARAM Counter = 1, then step it to N in
increments of 1.

Express your register and potentiometer as TABLE functions of
"Counter"

THIS IS A MAJOR FLAW IN PSPICE, Charlie!!

...Jim Thompson
Well, if he needed to have these guys vary independently, then he can
use Advanced Analysis, and do a multi-parameter simulation. (I know
you haven't played with this, Jim, since it is sorta hard to do from
Schematics. There have to be a FEW advantages for using Capture and
Concept... ) However, in this case, they need to be linked, since
the pot value and the register value are linked, so he needs to just
have a defined relationship. I have often had a single parameter
defined in a PARAM, and have the second defined as an expression.
Since this is a register/counter/pot relationship, this implies an
analog to digital conversion, tricky in an expression. I would
probably build in a circuit to do the ADC for me, or DAC if setting
the register made more sense.

Charlie

Werll, heres an A/D

..SUBCKT Analog8BitAtoD_XN _ssi_pin_d8 _ssi_pin_d7 _ssi_pin_d6
_ssi_pin_d5 _ssi_pin_d4 _ssi_pin_d3 _ssi_pin_d2 _ssi_pin_d1 ain_p
_ssi_pin_aref _ssi_pin_dref
* _SS_Symbol [C:\Program Files\AnaSoft\SuperSpice\system\MixedMode.ssm]
[Analog8BitAtoD]
*
*This model can be distributed provided this notice remains
*copyright (c) Kevin Aylward, 2004, kevin.aylward@anasoft.co.uk
*This is an analog A to D
* d0 is lsb. aref is the +/-vin range. dref is the digital output level
e.g. 5V supplies
* output and input is referanced to 0V.
*
boffset ain 0 v=v(ain_p)/2 + v(_ssi_pin_aref)/2
*
b1 _ssi_pin_d1 0 v=u(v(ain) - v(_ssi_pin_aref)/2 ) * v(_ssi_pin_dref)
b2p 2p 0 v=v(ain) - v(_ssi_pin_d1) *v(_ssi_pin_aref)/v(_ssi_pin_dref)/2
*
b2 _ssi_pin_d2 0 v=u( v(2p ) - v(_ssi_pin_aref)/4)*v(_ssi_pin_dref)
b3p 3p 0 v=v(2p) - v(_ssi_pin_d2) *v(_ssi_pin_aref)/v(_ssi_pin_dref)/4
*
b3 _ssi_pin_d3 0 v=u( v(3p ) - v(_ssi_pin_aref)/8)*v(_ssi_pin_dref)
b4p 4p 0 v=v(3p) - v(_ssi_pin_d3) *v(_ssi_pin_aref)/v(_ssi_pin_dref)/8
*
b4 _ssi_pin_d4 0 v=u( v(4p ) - v(_ssi_pin_aref)/16)*v(_ssi_pin_dref)
b5p 5p 0 v=v(4p) - v(_ssi_pin_d4) *v(_ssi_pin_aref)/v(_ssi_pin_dref)/16
*
b5 _ssi_pin_d5 0 v=u( v(5p ) - v(_ssi_pin_aref)/32)*v(_ssi_pin_dref)
b6p 6p 0 v=v(5p) - v(_ssi_pin_d5) *v(_ssi_pin_aref)/v(_ssi_pin_dref)/32
*
b6 _ssi_pin_d6 0 v=u( v(6p ) - v(_ssi_pin_aref)/64)*v(_ssi_pin_dref)
b7p 7p 0 v=v(6p) - v(_ssi_pin_d6) *v(_ssi_pin_aref)/v(_ssi_pin_dref)/64
b7 _ssi_pin_d7 0 v=u( v(7p ) - v(_ssi_pin_aref)/128)*v(_ssi_pin_dref)
b8p 8p 0 v=v(7p) - v(_ssi_pin_d7)
*v(_ssi_pin_aref)/v(_ssi_pin_dref)/128
*
b8 _ssi_pin_d8 0 v=u( v(8p ) - v(_ssi_pin_aref)/256)*v(_ssi_pin_dref)
*
..ends

Its a successive approximation without a clock.!

Tyhee is a working example in SS.

and the D/A

..SUBCKT Analog8BitDtoA_XN _ssi_pin_d0 _ssi_pin_d1 _ssi_pin_d2
_ssi_pin_d3 _ssi_pin_d4 _ssi_pin_d5 _ssi_pin_d6 _ssi_pin_d7 aout
_ssi_pin_aref _ssi_pin_dref
* _SS_Symbol [C:\Program Files\AnaSoft\SuperSpice\system\MixedMode.ssm]
[Analog8BitDtoA]
*
*This model can be distributed provided this notice remains
*copyright (c) Kevin Aylward, 2004, kevin.aylward@anasoft.co.uk
*This is an analog D to A
* d0 is lsb. aref is the +/-vout range. dref is the digital switch
point, e.g. 2.5 on 5V supplies
* output and input is referanced to 0V.
* The 1/512 is 1/2 lsb offset to provide for symetrical swings etc...
*
b1 aout 0 v= 2*v(_ssi_pin_aref) *
+ ( (u( v(_ssi_pin_d0) - v(_ssi_pin_dref)) + u( v(_ssi_pin_d1) -
v(_ssi_pin_dref))*2 + u( v(_ssi_pin_d2) - v(_ssi_pin_dref))*4 + u(
v(_ssi_pin_d3) - v(_ssi_pin_dref))*8
+ + u( v(_ssi_pin_d4) - v(_ssi_pin_dref))*16 + u( v(_ssi_pin_d5) -
v(_ssi_pin_dref))*32 + u( v(_ssi_pin_d6) - v(_ssi_pin_dref))*64 + u(
v(_ssi_pin_d7) - v(_ssi_pin_dref))*128
+ ) /256 - 0.5 + 1/512)
..ends

Kevin Aylward
informationEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

Aug 7, 2005

there is no such a "look-up table" in ORCAD pspice A/D 9.2. I've spent
three days on studing advanced simulation by pspice and draw a
conclusion:

....write two sub circuit files and define the two registers as two
function of a parameter, e.g. a counter N, respectively, then do
simulation.
this is silly 'coz I must solve the LMS interpolation to find
coefficients of equations by using somekind of maths software package.
e.g. IDL, Matlab.
then go back to ORCAD.

The ORCAD optimizer is garbage, don't try to learn, it'll waste your
time.

okey, it's concluded.

Jim Thompson · Aug 8, 2005

On 7 Aug 2005 17:46:48 -0700, leelsuc@yahoo.com wrote:

there is no such a "look-up table" in ORCAD pspice A/D 9.2. I've spent
three days on studing advanced simulation by pspice and draw a
conclusion:

What are you running on, a contraband copy? You'll find Etable,
Gtable and just plain "Table" in the PSpice Users Guide.

...write two sub circuit files and define the two registers as two
function of a parameter, e.g. a counter N, respectively, then do
simulation.
this is silly 'coz I must solve the LMS interpolation to find
coefficients of equations by using somekind of maths software package.
e.g. IDL, Matlab.
then go back to ORCAD.

The ORCAD optimizer is garbage, don't try to learn, it'll waste your
time.

That's alright, optimizers are for amateurs ;-)

okey, it's concluded.

480)460-2350 | |
| E-mail Address at Website Fax

Aug 8, 2005

I READ GTABLE/ETABLE BUT I DON'T KNOW HOW TO PLAY IT.

I RUN SVBKSB (I.E. singular value backsubstitution) UP TO 4RD ORDER TO
CAL. COEFFICIENTS. IT WORKS WELL. 3RD ORDER IS ENOUGH.

IF YOU HAVE TIME, JUST SHOW US SOME EXAMPLE CODES OF HOW TO USE
GTABLE/ETABLE FOR AN ANALOG REGISTER.

THANKS.

Jim Thompson · Aug 8, 2005

On 8 Aug 2005 14:10:30 -0700, leelsuc@yahoo.com wrote:

I READ GTABLE/ETABLE BUT I DON'T KNOW HOW TO PLAY IT.

I RUN SVBKSB (I.E. singular value backsubstitution) UP TO 4RD ORDER TO
CAL. COEFFICIENTS. IT WORKS WELL. 3RD ORDER IS ENOUGH.

IF YOU HAVE TIME, JUST SHOW US SOME EXAMPLE CODES OF HOW TO USE
GTABLE/ETABLE FOR AN ANALOG REGISTER.

THANKS.

480)460-2350 | |
| E-mail Address at Website Fax

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