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Cut&Paste error in statistical parameter file #272
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Another case of Cut&Paste in sg13g2_moslv_stat.lib (abbreviated): param sg13g2_lv_nmos_vfbo_mm ='gauss(sg13g2_lv_nmos_vfbo_mm_norm , 0.004, mc_ok)' param sg13g2_lv_pmos_vfbo_mm ='gauss(sg13g2_lv_pmos_vfbo_mm_norm, 0.004, mc_ok)' It's unbelievable that the variations of lv nmos and pmos are identical. hv nmos statistical is not affected. |
…P-GmbH#272 Signed-off-by: dwarning <dwarning>
Hi Dietmar, you are right in both cases this is very likely a bug. In the closed PDK the pmos parameters are different. Our bad...
Please double check these values and let me know if you agree. |
Hi Markus, |
Changes in #269 |
Looking into file IHP-Open-PDK/ihp-sg13g2/libs.tech/ngspice/models/cornerMOSlv.lib we see in typical (tt) section (abbreviated for better readability):
`
LIB mos_tt
param sg13g2_lv_nmos_vfbo_mm= 1.0
param sg13g2_lv_nmos_ctl = 1.2080
param sg13g2_lv_nmos_rsw1 = 0.7200
param sg13g2_lv_nmos_muew = 0.8500
param sg13g2_lv_nmos_dphibo = 0.9915
param sg13g2_lv_nmos_dphibl = 0.9693
param sg13g2_lv_pmos_vfbo_mm= 1.0
param sg13g2_lv_pmos_ctl = 1.9570
param sg13g2_lv_pmos_rsw1 = 0.7720
param sg13g2_lv_pmos_muew = 1.0520
param sg13g2_lv_pmos_dphibo = 0.9050
param sg13g2_lv_pmos_dphibl = 0.8550
include sg13g2_moslv_mod.lib
ENDL mos_tt`
So we see that we have different parameters (act as factor) for nmos and pmos.
Next section is for statistical simulation in typical corner:
`
LIB mos_tt_stat
param sg13g2_lv_nmos_vfbo_mm_norm= 1.0
param sg13g2_lv_nmos_ctl_norm = 1.2080
param sg13g2_lv_nmos_rsw1_norm = 0.7200
param sg13g2_lv_nmos_muew_norm = 0.8500
param sg13g2_lv_nmos_dphibo_norm = 0.9915
param sg13g2_lv_nmos_dphibl_norm = 0.9693
param sg13g2_lv_pmos_vfbo_mm_norm= 1.0
param sg13g2_lv_pmos_ctl_norm = 1.2080
param sg13g2_lv_pmos_rsw1_norm = 0.7200
param sg13g2_lv_pmos_muew_norm = 0.8500
param sg13g2_lv_pmos_dphibo_norm = 0.9915
param sg13g2_lv_pmos_dphibl_norm = 0.9693
include sg13g2_moslv_stat.lib
include sg13g2_moslv_mod.lib
ENDL mos_tt_stat`
The problem is that the nmos parameter are taken over from tt section into the stat section - but pmos not. They are a simple copy of the nmos parameter. Looks like a cut and paste error and follows in wrong results for tt_stat pmos simulations.
Other sections in lv and hv Corner lib have not this bug.
BTW - I see no need to create additional parameter for statistical simulation with _norm in the end of name. Just using the tt, ff, ss parameter is sufficient.
@miesli : In case you are still there, can you comment please.
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