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When i do the ultrasim in cadence.
I want to save the point information with this option
"usim_save file="/home/temp/tt" time=1u repeat=2m
but we run, it reports the error. I make sure the directory is correct and can write the file in
my directory. Do you know what's in my setting as...
cmos cgd
you can find the mobility(u) from model file by the parameter (u0)
and threshold voltage by the parameter VTH.
also you can calculate the Cox by the parameter TOX in the model file following the equation
Cox=3.45fF*(100e-10)/TOX.
Generally, you can calculate the gm as the equations...
ldo(low drop-out) ë ˆê·¤ë ˆì´í„°ëž€
Firstly, you can simulate loop with the H_SPICE to see there is enough PM
then, you can test its stable by the transient load step from light load current to
heavy load current or from heavy load to light load.
Dear All
If there are any hints to find out which device has too much leakage current in my project when the tool is the H_spice.
As far as I consider, I will firstly find out which block consume too much leakage current and then push into the block to find out which device is it.
Could you...
analog layout matching
Hi
There are too many document abaout layout match.
First, you can refer to the Alan Hasstings' book "The Art of Analog Layout"
This is most famous book about analog layout.
Then you can also refer to the following material.
Please take advantage of the comparator for comparing the bipolar Vbe( or Veb) with the voltage reference. Generally, the bipolar Vbe has a
negative temperature coefficient, so when the temperature rise ,this voltage will go down.
Generally, 3uA is OK. If the pnp bipolar is used, the main point is making the bipolar working in the region that its beta is constant when your current changes.
hspice alter
As far as I know, you don't need using the " .dle lib....", if you want to change the model file, you can using the ".alter" and ".include ...." directly.
You can also refer the manual of Hspice for more information.
Generally, the current limit is tested when it works in the low duty.And in low duty, the slope compensation is so small that you can ignore .
I don't think you can acquire the current amp's gain from datasheet. Maybe what you interest in is the transconductance of the current sense.
Bandgap Voltage.
Why don't you search papers in this site?
There are many papers about lower voltage supply for the the bandgap. You can find some useful papers. Good luck!
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