Multisim9 is not simulating signal delay with inverters

Guest
Greetings,

I've created a simple circuit in Multisim9 (evaluation version),
(Windows XP)
with two ClockVoltage sources (digital oscillators). The first one goes
directly to an LED, the second one is fed through 6 hex inverters to
delay the circuit. There are 3 'tap' points after every two inverters
connected to a (virtual) oscilliscope.

With 'real simulation' settings, the 'tapped' points show no delay on
the oscilliscope. With 'ideal' settings chosen, the 'tapped' points
display just a flat waveform.

Here are pics :

http://putfile.com/pic.php?pic=main/...5569.jpg&s=f10
http://putfile.com/pic.php?pic=main/...2134.jpg&s=f10

Any idea why the delays are not simulated / displayed? I'm using
default settings for the simulator.

I also set up the same circuit in MicroCap.

With MicroCap's "Probe Transient" menu, I'm getting the expected
resuts.

http://putfile.com/pic.php?pic=main/...2012.jpg&s=f10

Mike
 
arggh, mangled links ... here they are
..
Here are pics :

http://putfile.com/pic.php?pic=main/7/19515405569.jpg&s=f10
Click to expand...
http://putfile.com/pic.php?pic=main/7/19515272134.jpg&s=f10
http://putfile.com/pic.php?pic=main/7/19516302012.jpg&s=f10
 
Do you mean they are not showing the propagational/setup time delays? I
still use MS7 and I don't remember it being in there. If I'm not mistaken,
the delays are only a few nanoseconds in real time, maybe you need to zoom
in more to see it? Setting the timebase very small should show the clock
edge as a steepening ramp.

<mstramba@sympatico.ca> wrote in message
news:1153013499.682066.240930@m79g2000cwm.googlegroups.com...
Greetings,

I've created a simple circuit in Multisim9 (evaluation version),
(Windows XP)
with two ClockVoltage sources (digital oscillators). The first one goes
directly to an LED, the second one is fed through 6 hex inverters to
delay the circuit. There are 3 'tap' points after every two inverters
connected to a (virtual) oscilliscope.

With 'real simulation' settings, the 'tapped' points show no delay on
the oscilliscope. With 'ideal' settings chosen, the 'tapped' points
display just a flat waveform.

Here are pics :

http://putfile.com/pic.php?pic=main/...5569.jpg&s=f10
http://putfile.com/pic.php?pic=main/...2134.jpg&s=f10

Any idea why the delays are not simulated / displayed? I'm using
default settings for the simulator.

I also set up the same circuit in MicroCap.

With MicroCap's "Probe Transient" menu, I'm getting the expected
resuts.

http://putfile.com/pic.php?pic=main/...2012.jpg&s=f10

Mike
Click to expand...
 
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