eldo_user

Eldo Control Language
.PRINTFILE Alternative #2
* Generate a .csv file.
.define_testbench netlist (pvdd=1.5)
* op amp
m16 vdd bias m17d vdd p w=4.8u l=1.2u
m17 m17d m17d vss vss n w=3.2u l=1.2u
m15 m15d m17d vss vss n w=3.2u l=1.2u
m13 m13d m17d vss vss n w=3.2u l=1.2u
m14 vdd m15d m15d vdd p w=1u l=1.2u
m12 vdd m13d m13d vdd p w=4.8u l=1.2u
m3 vdd m13d m1d vdd p w=4.8u l=1.2u
m4 vdd m13d m2d vdd p w=4.8u l=1.2u
m11 vdd m13d out vdd p w=16u l=1.2u
m1 m1d inp com com n w=0.8u l=0.6u
m2 m2d inn com com n w=0.8u l=0.6u
m9 com m17d vss vss n w=3.2u l=1.2u
m5 m2d m15d m7d vdd p w=2.4u l=1.2u
m6 m1d m15d m8d vdd p w=2.4u l=1.2u
m7 m7d m7d vss vss n w=1.6u l=1.2u
m8 m8d m7d vss vss n w=1.6u l=1.2u
cx m8d out 0.2p ! lousy compensation cap.
cl out 0 1p ! load cap.
m10 out m8d vss vss n w=13u l=1.2u
vb bias 0 0.95V
**************************
.option tuning=vhigh
**************************
* powersupply
vdd vdd 0 pvdd
vss vss 0 -pvdd
.connect out inn ! follower connection
vinp inp 0 DC 0
.dc
.extract dc label=vout_follower V(out)
.extract dc label=dc_offset V(inp)-V(out)
.end_define_testbench
*========================================================================
.define_task print_dc_offset (n=40)
set loop_param=0
set vdd[]=1.65
set dc_offset[]=0
// create the .csv file
set csv_file = fopen("results.csv", "w")
// for each value of VDD from 1.5V to 1.8V, find out the DC offset
step (type=step, param=loop_param, start=1, stop=n, step=1)
vdd[loop_param] = 1.5 + (loop_param-1) * (1.8-1.5) / (n-1)
simulation(
+ name = "simu_dc_offset/simu.cir",
+ netlist(pvdd = vdd[loop_param]),
+ dc_offset[loop_param] = @vout_follower)
1130
Eldo® User's Manual, 15.3