Timer by Pspice

J

Joey-zyzmax

Guest
Hello all, I have to simulate a digital circuit, in the circuit there
is a timer triggled by a leading edge pluse, it is to say that when the
leading edge comes, then the timer start working. I don't know how to
realize it bu PSpice. can someone help me, thank you very much.
 
On 21 Aug 2005 23:41:52 -0700, "Joey-zyzmax" <zyzmax001@163.com>
wrote:

Hello all, I have to simulate a digital circuit, in the circuit there
is a timer triggled by a leading edge pluse, it is to say that when the
leading edge comes, then the timer start working. I don't know how to
realize it bu PSpice. can someone help me, thank you very much.
Click to expand...
Circuit? Do you have PSpice A/D?

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Joey-zyzmax <zyzmax001@163.com> wrote:
: Hello all, I have to simulate a digital circuit, in the circuit there
: is a timer triggled by a leading edge pluse, it is to say that when the
: leading edge comes, then the timer start working. I don't know how to
: realize it bu PSpice. can someone help me, thank you very much.

PSpice is exactly the wrong tool to use for simulation of digital
circuits. [1] Try using something like Tkgate instead:

http://www.tkgate.org/

Stuart

[1] Yes I know the quibblers and nit-pickers on this froup will say
that you can do some level of digital stuff in PSpice. The point here
is that Hr. Zyzmax is evidently a clueless newbie, using SPICE to do
digital stuff is a non-optimal way to work, and so Hr. Zyzmax should
be helped to find a more appropriate tool.
 
On Mon, 22 Aug 2005 15:38:32 -0000, Stuart Brorson <sdb@cloud9.net>
wrote:

Joey-zyzmax <zyzmax001@163.com> wrote:
: Hello all, I have to simulate a digital circuit, in the circuit there
: is a timer triggled by a leading edge pluse, it is to say that when the
: leading edge comes, then the timer start working. I don't know how to
: realize it bu PSpice. can someone help me, thank you very much.

PSpice is exactly the wrong tool to use for simulation of digital
circuits. [1] Try using something like Tkgate instead:

http://www.tkgate.org/

Stuart

[1] Yes I know the quibblers and nit-pickers on this froup will say
that you can do some level of digital stuff in PSpice. The point here
is that Hr. Zyzmax is evidently a clueless newbie, using SPICE to do
digital stuff is a non-optimal way to work, and so Hr. Zyzmax should
be helped to find a more appropriate tool.
Click to expand...
Spricht so den Dorfidioten.

PSpice A/D does quite nicely as a digital simulation tool and includes
a nice selection of 'HC CMOS parts (as well as most other commercially
available stuff) to select from.

And PSpice can also do MIXED analog and digital circuits.

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Jim Thompson <thegreatone@example.com> wrote:
: On Mon, 22 Aug 2005 15:38:32 -0000, Stuart Brorson <sdb@cloud9.net>
: wrote:

:>Joey-zyzmax <zyzmax001@163.com> wrote:
:>: Hello all, I have to simulate a digital circuit, in the circuit there
:>: is a timer triggled by a leading edge pluse, it is to say that when the
:>: leading edge comes, then the timer start working. I don't know how to
:>: realize it bu PSpice. can someone help me, thank you very much.
:>
:>PSpice is exactly the wrong tool to use for simulation of digital
:>circuits. [1] Try using something like Tkgate instead:
:>
:>http://www.tkgate.org/
:>
:>Stuart
:>
:>[1] Yes I know the quibblers and nit-pickers on this froup will say
:>that you can do some level of digital stuff in PSpice. The point here
:>is that Hr. Zyzmax is evidently a clueless newbie, using SPICE to do
:>digital stuff is a non-optimal way to work, and so Hr. Zyzmax should
:>be helped to find a more appropriate tool.

: Spricht so den Dorfidioten.

Weil Sie auf meinen Post reagieret haben, so muss ich annehme, dass Sie
under den Dorfidioten stehen. :) [1]

: PSpice A/D does quite nicely as a digital simulation tool and includes
: a nice selection of 'HC CMOS parts (as well as most other commercially
: available stuff) to select from.

: And PSpice can also do MIXED analog and digital circuits.

Wonderful. Does Hr. Zyzmax need to do mixed signal analysis? Or is he
analyzing a clocked counter? Does PSpice handle synchronous logic
analysis, or is it only useful for combinational logic analysis? And
if you can do synchronous logic analysis, is there a graphical
primitive (i.e. symbol) for a clock oscillator?

And does Hr. Zyzmax need a >$1000 "upgrade" to get any of the required
features for logic work?

Stuart

[1] Kaum zu glauben fuer ein Messingrattetraeger, nicht?
 
On Mon, 22 Aug 2005 16:35:57 -0000, Stuart Brorson <sdb@cloud9.net>
wrote:

Jim Thompson <thegreatone@example.com> wrote:
: On Mon, 22 Aug 2005 15:38:32 -0000, Stuart Brorson <sdb@cloud9.net
: wrote:
[snip]
:>PSpice is exactly the wrong tool to use for simulation of digital
:>circuits. [1] Try using something like Tkgate instead:
:
:>http://www.tkgate.org/
:
:>Stuart
:
:>[1] Yes I know the quibblers and nit-pickers on this froup will say
:>that you can do some level of digital stuff in PSpice. The point here
:>is that Hr. Zyzmax is evidently a clueless newbie, using SPICE to do
:>digital stuff is a non-optimal way to work, and so Hr. Zyzmax should
:>be helped to find a more appropriate tool.

: Spricht so den Dorfidioten.

Weil Sie auf meinen Post reagieret haben, so muss ich annehme, dass Sie
under den Dorfidioten stehen. :) [1]

: PSpice A/D does quite nicely as a digital simulation tool and includes
: a nice selection of 'HC CMOS parts (as well as most other commercially
: available stuff) to select from.

: And PSpice can also do MIXED analog and digital circuits.

Wonderful. Does Hr. Zyzmax need to do mixed signal analysis? Or is he
analyzing a clocked counter? Does PSpice handle synchronous logic
analysis, or is it only useful for combinational logic analysis? And
if you can do synchronous logic analysis, is there a graphical
primitive (i.e. symbol) for a clock oscillator?

And does Hr. Zyzmax need a >$1000 "upgrade" to get any of the required
features for logic work?

Stuart

[1] Kaum zu glauben fuer ein Messingrattetraeger, nicht?
Click to expand...
Looks like you should avoid Babelfish ;-)

You should also avoid commenting on a simulator which you have
obviously never seen, let alone exercised. Clearly you've missed my
schematic posts on A.B.S.E which included digital components.

GNU nuts are just about as uninformed as leftist weenies ;-)

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Jim Thompson <thegreatone@example.com> wrote:

: Looks like you should avoid Babelfish ;-)

Fuer Deutsch brauchue ich kein Bablefish.

: You should also avoid commenting on a simulator which you have
: obviously never seen, let alone exercised. Clearly you've missed my
: schematic posts on A.B.S.E which included digital components.

I don't read a.b.s.e. Please post a pointer to a schematic you've
produced which best suggests how a clocked counter/timer can be
simulated using PSpice. I will then be happy to look at it using
groups.google.com.

Ultimately, I still think that using SPICE of any type is not the best
way to simulate simple digital circuits since SPICE is a stepped-time
simulator. Better, I think, to use an event-driven simulator.
However, I am willing to be proven wrong about the specific
capabilities of PSpice.

: GNU nuts are just about as uninformed as leftist weenies ;-)

Naw, Free Software types are too busy writing code and doing real work
to waste time looking at the alt.binaries.* hierarchy.

Stuart
 
On Mon, 22 Aug 2005 19:08:12 -0000, Stuart Brorson <sdb@cloud9.net>
wrote:

Jim Thompson <thegreatone@example.com> wrote:

: Looks like you should avoid Babelfish ;-)

Fuer Deutsch brauchue ich kein Bablefish.

: You should also avoid commenting on a simulator which you have
: obviously never seen, let alone exercised. Clearly you've missed my
: schematic posts on A.B.S.E which included digital components.

I don't read a.b.s.e. Please post a pointer to a schematic you've
produced which best suggests how a clocked counter/timer can be
simulated using PSpice. I will then be happy to look at it using
groups.google.com.

Ultimately, I still think that using SPICE of any type is not the best
way to simulate simple digital circuits since SPICE is a stepped-time
simulator.
Click to expand...
Only for analog.

Better, I think, to use an event-driven simulator.
Click to expand...
Which PSpice is in digital mode.

However, I am willing to be proven wrong about the specific
capabilities of PSpice.

: GNU nuts are just about as uninformed as leftist weenies ;-)

Naw, Free Software types are too busy writing code and doing real work
to waste time looking at the alt.binaries.* hierarchy.

Stuart
Click to expand...
PSpice digital simulation is event-driven, unless analog components
are added. See the following on the S.E.D/Schematics page of my
website.

DivideBy2p5.pdf

HowManyOnes.pdf

OneSecPulseWidthOncePerHour.pdf

SequencingLEDsForTurnSignals.pdf

SyncRingOsc.pdf

TwoBitUpDownGrayCounter.pdf

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Hi Jim and Stuart, thanks very much for your advise and help. I of
course have a PSpice A/D. and the digital circuit is only a small part
of my design, also there are a lot of analog parts in my design. so I
think PSpice is really the good tool to simulate it. to avoid using
A-to-D and D-to-A subcircuits. I decide to use analog behavioral
modeling(ABM) to replace the digital part. also the timer can be
realized by using a VPLUSE, but the big problem for me is how to
realize a timer triggled by a leading edge. Maybe I need to use the
Customizing Device Equations using C language. but I think it is too
hard for me to use it. is there some good ideas for me? thank you very
much.
 
On 22 Aug 2005 18:01:49 -0700, "Joey-zyzmax" <zyzmax001@163.com>
wrote:

Hi Jim and Stuart, thanks very much for your advise and help. I of
course have a PSpice A/D. and the digital circuit is only a small part
of my design, also there are a lot of analog parts in my design. so I
think PSpice is really the good tool to simulate it. to avoid using
A-to-D and D-to-A subcircuits. I decide to use analog behavioral
modeling(ABM) to replace the digital part. also the timer can be
realized by using a VPLUSE, but the big problem for me is how to
realize a timer triggled by a leading edge. Maybe I need to use the
Customizing Device Equations using C language. but I think it is too
hard for me to use it. is there some good ideas for me? thank you very
much.
Click to expand...
Are you trying to realize a digital timer (with a clock), or an analog
timer, like a 555 (for example) or other one-shot?

There are behavioral (digital) one-shots in the library. You just
specify a time and away you go.

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Stuart Brorson wrote:
Jim Thompson <thegreatone@example.com> wrote:

Looks like you should avoid Babelfish ;-)

Fuer Deutsch brauchue ich kein Bablefish.

You should also avoid commenting on a simulator which you have
obviously never seen, let alone exercised. Clearly you've missed my
schematic posts on A.B.S.E which included digital components.

I don't read a.b.s.e. Please post a pointer to a schematic you've
produced which best suggests how a clocked counter/timer can be
simulated using PSpice. I will then be happy to look at it using
groups.google.com.

Ultimately, I still think that using SPICE of any type is not the best
way to simulate simple digital circuits since SPICE is a stepped-time
simulator. Better, I think, to use an event-driven simulator.
Click to expand...
Pretty much *all* of the major Spices (e.g. SuperSpice, EWB, CM, B2
Spice, TINA etc) use the XSpice version of Spice3, with the XSpice bit
containing the full event driven digtital whatsit.


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.
 
I really want a analog timer, but I don't think 555 is a good way,
because there are several timers in my design, so if I use 555, I think
the simulation time maybe long
 
On 23 Aug 2005 16:56:41 -0700, "Joey-zyzmax" <zyzmax001@163.com>
wrote:

I really want a analog timer, but I don't think 555 is a good way,
because there are several timers in my design, so if I use 555, I think
the simulation time maybe long
Click to expand...
Look in 1_Shot.lib/1_Shot.slb

These models are mostly behavioral and simulate very quickly.

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Ok, I will try it, thanks very much for your help


Jim Thompson 写道：

On 23 Aug 2005 16:56:41 -0700, "Joey-zyzmax" <zyzmax001@163.com
wrote:


I really want a analog timer, but I don't think 555 is a good way,
because there are several timers in my design, so if I use 555, I think
the simulation time maybe long

Look in 1_Shot.lib/1_Shot.slb

These models are mostly behavioral and simulate very quickly.

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
Click to expand...
 
Joey-zyzmax wrote:
I really want a analog timer, but I don't think 555 is a good way,
because there are several timers in my design, so if I use 555, I
think the simulation time maybe long
Click to expand...
Again, all the major spice vendors use XSpice. XSpice has inbuilt
analogue timers, vcos etc. that run very fast. Why dont you read the
documentation?

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.
 
I want a signal to triggle the timer to work, but the inbuilt analogue
timers don't this function.


Kevin Aylward 写道：

Joey-zyzmax wrote:
I really want a analog timer, but I don't think 555 is a good way,
because there are several timers in my design, so if I use 555, I
think the simulation time maybe long

Again, all the major spice vendors use XSpice. XSpice has inbuilt
analogue timers, vcos etc. that run very fast. Why dont you read the
documentation?

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.
Click to expand...
 
On 24 Aug 2005 18:02:04 -0700, "Joey-zyzmax" <zyzmax001@163.com>
wrote:

I want a signal to triggle the timer to work, but the inbuilt analogue
timers don't this function.


[snip]
Click to expand...

Sure they do, RTFM!

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Joey-zyzmax wrote:
I want a signal to triggle the timer to work, but the inbuilt analogue
timers don't this function.
Click to expand...
There is an XSpice voltage controlled oneshot. i.e. a timer. You can set
it to generate a pulse on, say, a rising edge, and then use a second one
to trigger on the the falling edge of the first oneshot, hence you have
a delayed pulse.


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.
 
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