Hi Guys,
I'm really confused by the AC capacitor in a serial link, who can detail its function? In our simulation,how to deal with it?
I want to use the S parameter model, which can be found from its supplier. But when the upper frequency of the model is only 6G Hz, i can't use it in my 6G Hz simulation again. I also found another option to deal with this problem, its main thought is model the ESL and ESR of a capacitor, not directly use it but divide ESL/ESR value to some small inductor/resistor, as below showing. But how does this model working?
(ESpice ".subckt Cap2 1 2
C1 1 0 0.15p
R1 1 3a 0.001
L1 3a 4a 0.2n
R1a 4a 3 0.001
L1a 3 4b 0.2n
R1b 4b 3ab 0.001
L1b 3ab 4ab 0.2n
R1ab 4ab 3b 0.001
L1ab 3b 4 0.2n
* CB 4 5 100n * uncomment to use 100nF series cap
R2 4 6a 0.001 * change node 4 to 5 when using cap
L2 6a 2a 0.1n
R2a 2a 6 0.001
L2a 6 4c 0.1n
R2c 4c 6ac 0.001
L2c 6ac 2ac 0.1n
R2c 2ac 6c 0.001
L2c 6c 4b 0.1n
R2b 4b 6ab 0.001
L2b 6ab 2ab 0.2n
R2ab 2ab 6b 0.001
L2ab 6b 2 0.2n
C2 2 0 0.15p
RS 1 2 100k
.ends Cap2
" )