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Perhaps, I should repeat my question above more clearly.
first, why the Vgs should be vt+200mV while ploting gm*ro versus vds?
second, while sweeping vds, the actual threshold voltage would change as well, how should we define the value of "vt" in the "vt+200mV". Is the "vt" equal to "vth0"...
Hello everyone,
I want to observe gm of a nmos with a constant drain current but different vds.
The drain of nmos is connected with a current source and its source is connected to ground. How should I connect the gate of the nmos, since the drain current is constant and the vds is varying...
operation point mosfet spectre
I did it as tanuuaner said, and it works.
but it seems to waste a sweep variable, because the dc sweep and the parametric analysis use the same seep variable.
Is there any other methods?
thanks!
plot dc sweep parameters,spectre
Thanks for your reply.
I did the setting as you mentioned, and run the dc simulation. However, I only can get a value of gm correspond to the value of Vgs set in variable tab, instead of a waveform.
Is there any other methods?
spectre transconductance
Hello everyone,
I am confused how can i plot the operation point parameters with sweep variable in Spectre?
For example, how to plot transconductance of a MOSFET versus Vgs?
Thank you so much!
asitic *.tek
hi, everyone.
I'm new with ASITIC. In the example of the technology file for ASITIC, there is a metal0 layer which is in the epi layer and this layer is used to ground the substrate.
In my case, the process which I use dose not include the epi layer, but I still need the...
hello everybody,
I assigned a box as "radiation" boundary and assigned a rectangle as "Perfect_E" boundary in HFSS. A face of the box and the rectangle are on the same position and their areas is the same.
When I run "Validation Check", there is a warning that "radiation" boundary and...
hi everybody,
I want to take the effect of eddy current formed in the substrate into account when simulate the spiral inductor with HFSS. How should I set the boundaries and terminals? Is there anything i should pay attention?
thanks!
hello everybody,
I want to simulate the performance of inductors with HFSS. I found that the poly layer was not added when I read some examples. Why? Is the simulation more accurate after adding the poly layer?
And is it appropriate to only add those shield metal layers under the...
cadence ron
sorry, it is my typing error. gds is common source output conductance.
I found the statement in cadence document that "ron" is on-resistance, while "gds" is common-source output conductance. Both of them are operating point parameters. What is the difference between ron and 1/gds...
ron gds
Dear all,
I found the statement in cadence document that "ron" is on-resistance, while "gds" is common-source output impedance. Both of them are operating point parameters. What is the difference between ron and 1/gds?
Furthermore, we usually caculate with the parameter "ro" during...
Dear all,
I designed a cascode current mirror with the relation
rout = gm4*ro4*ro2= 10 Mohm.
However, I got the simulation result that gm was 1 mA/V and ro2, ro4 was about 1 Kohm from "DC opation points" of Spectre , after runing dc analysis. The result of rout is apparently much less than...
Dear all,
i am not quite clear about the metal0 specification in ASITIC? Since it is assigned in the layer "epi", is metal0 equal to layer "poly" in the fabrication process?
Furthermore, i only know characteristic about the nwell and active area in PDK, how can i specify the "epi layer" in...
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