see the 3 "MEAS" statements.t_delay is from input voltage level xx to output voltage level yy.
Actually when we checked the error list, it shows no errors."calculate propagation delay in LTSPICE" doesn't make much sense. The delay can be measured in simulation waveforms, dragging the cursor or use a .measure statement. Or calculated with pencil and paper using simplified transistor models.
By the way, you keep posting flawed LTspice circuits, as in your previous thread. The nodes encircled in red have either unconnected wires or are shorting voltage sources. You should fix it to be sure what the simulated circuit actually is.
View attachment 164722
Actually when we checked the error list, it shows no errors.
True, the horizontal wires running into the encircled transistor terminals are unconnected. But why did you draw it? To obfuscate the circuit function? You better delete it to avoid confusing others and yourself.Actually when we checked the error list, it shows no errors.
Thank you. Will make these changes.True, the horizontal wires running into the encircled transistor terminals are unconnected. But why did you draw it? To obfuscate the circuit function? You better delete it to avoid confusing others and yourself.
--- Updated ---
Circuit schematic without unconnected wires
View attachment 164754
--- Updated ---
Circuit schematic without unconnected wires
View attachment 164754
Any idea about what does {RE} refer to? And why exactly is it needed here?Hi,
from post#2:
see the 3 "MEAS" statements.
--> input level xx = 0.5 x VDD rising
--> output level yy = 0.5 x VDD falling
--> delay is the time inbetween
Klaus
I never used it, but obviouslyAny idea about what does {RE} refer to? And why exactly is it needed here?
Yes. I get that. But why is the value made to 1? Is there any particular reason? Or can it be taken at random?Hi,
I never used it, but obviously
* RE = rising edge,
* FE = falling edge.
and you may use rising edge to falling edge (or vice versa) because you built an inverter.
Rising edge to rising edge won´t work.
Klaus
Why not use 2nd edge and check for differences? Despite of having powerfull .measure statements, it's usually faster and less error prone to read the delay with cursors from the waveform.Yes. I get that. But why is the value made to 1? Is there any particular reason? Or can it be taken at random?
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