Tengo una pregunta. Estoy intentando simular un oscilador en anillo con variación en Vth, ..., en hspice, pero no obtengo convergencia en el error de curvas de barrido de CC. Probé algunas de las soluciones para la convergencia, pero no tengo ningún éxito, ¿me pueden ayudar? El netlist & Los errores son los siguientes:
V1 vdd 0 0.9V
V2 vss 0 0V
.PARAM bias=1m
MN11 vss 15 11 vss N1 L=120n W=280n x=-7000u y=2000u
MP11 vdd 15 11 vdd P1 L=120n W=980n x=-7000u y=6000u
MN12 vss 11 12 vss N1 L=120n W=280n x=-5500u y=2000u
MP12 vdd 11 12 vdd P1 L=120n W=980n x=-5500u y=6000u
MN13 vss 12 13 vss N1 L=120n W=280n x=-4000u y=2000u
MP13 vdd 12 13 vdd P1 L=120n W=980n x=-4000u y=6000u
MN14 vss 13 14 vss N1 L=120n W=280n x=-2500u y=2000u
MP14 vdd 13 14 vdd P1 L=120n W=980n x=-2500u y=6000u
MN15 vss 14 15 vss N1 L=120n W=280n x=-1000u y=2000u
MP15 vdd 14 15 vdd P1 L=120n W=980n x=-1000u y=6000u
.MODEL N1 NMOS LEVEL = 54
.MODEL P1 PMOS LEVEL = 54
.Variation
.Global_Variation
Parameter var=N() Y='180 + 8.02 * var' Z='17.5 + 0.37 * var'
Nmos N1
+ VTH0=Perturb('Y')
Pmos P1
+ VTH0=Perturb('Y')
.End_Global_Variation
.Local_Variation
Parameter var=N() T='11.46 * var' U='0.54 * var'
Nmos N1
+ VTH0=Perturb('T')
Pmos P1
+ VTH0=Perturb('T')
.End_Local_Variation
.End_Variation
.op
.dc bias 1m 1m 1m monte=10
.print I(MN11) I(MN12)
.measure dc I11 find I(MN11) at=1m
.measure dc I12 find I(MN12) at=1m
.END
dcop: begin pseudo transient
dcop: ...failed with iteration exhausted
dcop: end pseudo transient
dcop: gshunt = 0.1000000E-03
dcop: gshunt = 0.5050000E-03
dcop: gshunt = 0.7277500E-03
dcop: gshunt = 0.8502625E-03
dcop: gshunt = 0.9176444E-03
dcop: gshunt = 0.9547044E-03
dcop: gshunt = 0.9750874E-03
dcop: gshunt = 0.9862981E-03
dcop: gshunt = 0.9924639E-03
dcop: gshunt = 0.9958552E-03
dcop: gshunt = 0.9977203E-03
dcop: gshunt = 0.9987462E-03
dcop: gshunt = 0.9993104E-03
dcop: gshunt = 0.9996207E-03
dcop: gshunt = 0.9997914E-03
dcop: gshunt = 0.9998853E-03
dcop: gshunt = 0.9999369E-03
dcop: gshunt = 0.9999653E-03
dcop: gshunt = 0.9999809E-03
dcop: gshunt = 0.9999895E-03
dcop: gshunt = 0.9999942E-03
dcop: gshunt = 0.9999968E-03
dcop: gshunt = 0.9999983E-03
dcop: gshunt = 0.9999990E-03
dcop: gshunt = 0.9999995E-03
dcop: gshunt = 0.9999997E-03
dcop: gshunt = 0.9999998E-03
dcop: gshunt = 0.9999999E-03
**error** no convergence in dc sweep curves at 1.00000E-03
Te pido que me ayudes.