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I varied Length and Width of MOS transistors to check its Stability Range and was wondering how i can sweep the values of length and width and do 1 simulation instead of taking screenshots after each variation.
Sorry ! i dont know much about this analysis I guess!
For your question, the most useful sources are help documents coming with cadence tools. Although some of them don't tell so much on how to do analysis in details, they are still good references in the first place.
we can do DC and transient as well! however , i was wondeering wetha we can get a graph of simulations?
Infact to make it more clear let me tell u tht i wna know about the performance of op-amp by varying certain variables like Length & W of the CMOS etc... Can i do it simultaneously by defining a range in cadence or is there any other method of checking the performance?
Normally, stb or ac simulation proceeds at a DC operating point that is calculated at the start of the sim. But there are times when it can be useful to have the stb or ac analysis performed at some other operating point. One example might be the far extreme transient output voltage swing of an amplifier, where the gain can be quite degraded compared to its midpoint. This email tells how to set that up.
1. Confiigure the simulator to run both a stb (or ac) and a transient simulation.
2. Configure the transient simulation to end at the point in time at which you wish the ac analysis to be performed. (For example, at a time when you know the amplifier's output will be at full-scale.)
3. In the simulation window, go to Analysis-->Choose-->stb (or ac)-->options, and set "prevoppoint" to "yes". This tells the simulator to use the final value of the transient simulation as the operating point for the stb or ac simulation.
4. Run the simulation. The transient will run first, then the stb or ac will run using the final value from the transient as the operating point.
and
I m in inverter tutorial and getting error =
xi0.m1: Effective length is less than or equal to zero.
I changed the L & W to a certain range but it did not help.
Moreover for an another project i need to vary L & W to a certain range and see its graph simultaneously ... Can i do this? I know i can vary dc ac voltage and all that in analysys section but how can i do this in case of physical parameters such as Length and Width?
Can i vary the performance by changing any other parameter?
Thanks fr suggestionI m in inverter tutorial and getting error =
xi0.m1: Effective length is less than or equal to zero.
I changed the L & W to a certain range but it did not help.
Moreover for an another project i need to vary L & W to a certain range and see its graph simultaneously ... Can i do this? I know i can vary dc ac voltage and all that in analysys section but how can i do this in case of physical parameters such as Length and Width?
Can i vary the performance by changing any other parameter?
Thanks fr suggestion
I m in inverter tutorial and getting error =
xi0.m1: Effective length is less than or equal to zero.
I changed the L & W to a certain range but it did not help.
Moreover for an another project i need to vary L & W to a certain range and see its graph simultaneously ... Can i do this? I know i can vary dc ac voltage and all that in analysys section but how can i do this in case of physical parameters such as Length and Width?
Can i vary the performance by changing any other parameter?
Thanks fr suggestionI m in inverter tutorial and getting error =
xi0.m1: Effective length is less than or equal to zero.
I changed the L & W to a certain range but it did not help.
Moreover for an another project i need to vary L & W to a certain range and see its graph simultaneously ... Can i do this? I know i can vary dc ac voltage and all that in analysys section but how can i do this in case of physical parameters such as Length and Width?
Can i vary the performance by changing any other parameter?
Thanks fr suggestion
I m in inverter tutorial and getting error =
xi0.m1: Effective length is less than or equal to zero.
I changed the L & W to a certain range but it did not help.
Moreover for an another project i need to vary L & W to a certain range and see its graph simultaneously ... Can i do this? I know i can vary dc ac voltage and all that in analysys section but how can i do this in case of physical parameters such as Length and Width?
Can i vary the performance by changing any other parameter?
Thanks fr suggestion
Excuse my question, but why did you perform a stability analysis ?
Any simulation makes only sense if you know the meaning of the parameter you simulate. Otherwise, you cannot use the results because you don´t understand it´s relevance.
I know, this was somewhat polemic, therefore, here comes my answer:
Phase margin PM=57.9 deg at 1.35 GHz (point with loop gain equal to 0 dB)
Gain margin GM=10.8 dB at app. 4 GHz (point with loop phase equal to 360 deg.)
I assume you know the meaning of PM and GM, don´t you ?
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