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The total current through the real circuit will be dominated by the leakage of the reverse-biased diode, so a few nA. The forward voltage of a similar silicon diode at that current will be tens of mV so close enough to zero.
Your measuring devices may be causing enough current to flow to get more forward voltage, but that would require more like 100uA than ...
3
You said you defined you own diode library and it looks like you haven't specified all the parameters? You put those triple-queries "???" there? I think if you check your library and fix this the issue will go away.
When I followed your link, and just searched for the "???" I found the suspicious code:
I think something isn't right there,...
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Your source has a frequency of 60 Hz and your primary inductance is 2 mH which has an impedance of 0.75 ohms at 60 Hz hence, more than 99.9 per cent of the applied voltage appears across the 100 ohm series resistor R2. Try making the primary inductance more like 2 henry if you want to model an AC power transformer. 2 mH is waaaayyyy too small and it gives ...
2
In LTspice, expressions are wrapped with braces: {}. Almost always, anyway. (I'm never 100% sure in any given situation. There seem to be various places where the parsing is a little bit different for one reason or another.)
In the case of resistors, you are allowed to use R=<expr> without using R={<expr>}. No, I don't know why. But I have ...
2
A brushed DC motor can be thought of as a brushless DC motor with electromechanical commutation -- and the brushes are half of that commutation mechanism.
So to a first order approximation, with all else being equal, a brushed DC motor and a brushless DC motor will behave the same.
The major difference in construction is that brushed and brushless DC motors ...
2
I found some errors in the original schematic, they are corrected.
For newer FETs, the quiescent current had to be set. I set this to 5mA with R19 and R25. (14k instead of 10k.) There is no point in looking in front of the LF356, there is only a -2 gain there (OP07).
The DC gain is approx. 174x.
DC transfer characteristics:
At 100Hz, the gain is approx. ...
1
What your simulation and actual real life measurement showed are in line with what I would expect. In order for a diode to start conducting, you need a forward voltage sufficient enough to overcome the depletion region. This is usually around 0.3V-0.7V, depending on the diode.
Now, this translates in your circuit as this:
20 V see the anode of D1, and since ...
1
For a beginner, I have to say Falstad is the easiest circuit sim to get going on. It’s easy to use and it does a really good job of visualizing current and voltage in a running circuit. It has lots of examples that you can easily customize.
Try it here: http://www.falstad.com/circuit/
Two other free Spice sims are LTSpice and Microcap. They’re good, but not ...
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The solution to my problem was to use another diode library from a different site (see link), which was compatible with LTspice.
ltwiki.org/index.php?title=Standard.dio
Another solution has been suggested which may suffice for those with deeper knowledge of electronics and the asociated simulation tools.
But, for those who are relative novice to the topic ...
1
Reposting from here since they answered the question
at the Cadence Community:
What you are asking isn’t possible although the issue isn’t due to the
extraction itself. The built-in microstrip models/pcells you are
using read their drawing layer info from the linetypes section
configured in the lpf, and which lpf linetype gets selected is
controlled by ...
1
A DC motor and controller combination and s BLDC motor and controller combination with identical combined performance parameters should have identical steady-state speed vs. torque capability. That is really another way of saying that the combined performance parameters are identical. The two systems could have nearly identical dynamic performance as well.
...
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