e.Horus
Junior Member level 3
source to bulk capacitance
Hello All,
I am trying to extract the source-bulk junction capacitance using eldo. The model I have is BSIM3v3 and the confusion is as follows:
There are two capacitances between the source and bulk
1. Intrinsic CSB which is due to the bulk charge.
2. Extrinsic CSB which is due to the junction between the source and bulk
How do I separate them?
Another problem is that I see that Csb>Cgs which is not what I expect since in theory Csb~(n-1)Cgs, where n is the slope factor (n~1.4). See the following output for example.
("Cdd" " 12.0628F ")
("Cdg" "-3.1755F ")
("Cds" " 6.4496A ")
("Cdb" "-8.8938F ")
("Cgd" "-3.1588F ")
("Cgg" " 13.6647F ")
("Cgs" "-6.9725F ")
("Cgb" "-3.5333F ")
("Csd" "-18.8414A ")
("Csg" "-7.3036F ")
("Css" " 19.9274F ")
("Csb" "-12.6049F ")
("Cbd" "-8.8851F ")
("Cbg" "-3.1856F ")
("Cbs" "-12.9613F ")
("Cbb" " 25.0320F ")
I appreciate any help.
Cheers
Hello All,
I am trying to extract the source-bulk junction capacitance using eldo. The model I have is BSIM3v3 and the confusion is as follows:
There are two capacitances between the source and bulk
1. Intrinsic CSB which is due to the bulk charge.
2. Extrinsic CSB which is due to the junction between the source and bulk
How do I separate them?
Another problem is that I see that Csb>Cgs which is not what I expect since in theory Csb~(n-1)Cgs, where n is the slope factor (n~1.4). See the following output for example.
("Cdd" " 12.0628F ")
("Cdg" "-3.1755F ")
("Cds" " 6.4496A ")
("Cdb" "-8.8938F ")
("Cgd" "-3.1588F ")
("Cgg" " 13.6647F ")
("Cgs" "-6.9725F ")
("Cgb" "-3.5333F ")
("Csd" "-18.8414A ")
("Csg" "-7.3036F ")
("Css" " 19.9274F ")
("Csb" "-12.6049F ")
("Cbd" "-8.8851F ")
("Cbg" "-3.1856F ")
("Cbs" "-12.9613F ")
("Cbb" " 25.0320F ")
I appreciate any help.
Cheers
