eldo_user

Eldo Control Language
Library of Functions for Tasks
.define_testbench mos (vgs_val = 1, vds_val = 1)
m1 d g s s n w=3.2u l=1.2u
vgs g s vgs_val
vds d s vds_val
.connect d 0
.dc
.extract dc label=m1_ids '-i(vds)'
.extract dc label=m1_mode opmode(m1)
.end_define_testbench
.define_task plot_ids_sat_and_lim_lin_sat
set vgs_res [] = 0
set vds_sat_res [] = 0
set ids_sat_res [] = 0
set w_ids_sat_vds = 0
set w_lim_lin_sat = 0
set vgs = 0
set vth = 0
set vth_min = 0
set vth_max = 5
set vds = 0
set vds_min = 0
set vds_max = 5
set m1_ids = 0
set m1_mode = ""
set i = 0
set iter = 0
/**
* Find vth by dichotomy.
*/
/* Check bounds. */
simulation(mos(vgs_val = vth_min), m1_mode = @m1_mode)
if (m1_mode != "subthreshold")
fprint(stdout, "Failed to find vth because with vgs=%eV,
opmode(m1)=%s\n",
vth_min, m1_mode)
return -1
endif
simulation(mos(vgs_val = vth_max), m1_mode = @m1_mode)
if (m1_mode == "subthreshold")
fprint(stdout, "Failed to find vth because with vgs=%eV,
opmode(m1)=%s\n",
vth_max, m1_mode)
return -1
endif
/* Dichotomy. */
while (abs(vth_max - vth_min) > 0.001 && iter < 50)
iter++
vth = vth_min + (abs(vth_max - vth_min) / 2)
simulation(mos(vgs_val = vth), m1_mode = @m1_mode)
if (m1_mode == "subthreshold")
vth_min = vth
else
vth_max = vth
Eldo® User's Manual, 15.3 991