wjxcom said:Hi, if you use Hspice, you can perform TRAN analysis, and save the operating points of the circuit to a file, and then you can load the file and perform the AC analysis. For example, you perform TRAN analysis:
.SAVE TYPE=IC FILE=RAIL2RAIL.IC LEVEL=ALL TIME=25U
.TRAN 0.1NS 30U START=0U
and then you can perform the AC analysis
.AC DEC 10 1 100MEG *SWEEP CC 0.5P 3P 0.1P
.LOAD RAIL2RAIL.IC0
you can get the help from the Hspice manul to understand the .save and .load!
regard!
hiwjxcom said:Hi hr_rezaee: I think .op time can only print the operating points, for example, .op 25u can print the operating pointsat 25u. Do you have another way to simulate the fully differential OPAMP with SC_CMFB?
regards
wjxcom said:.SAVE TYPE=IC FILE=RAIL2RAIL.IC LEVEL=ALL TIME=25U
.TRAN 0.1NS 30U START=0U
and then you can perform the AC analysis
.AC DEC 10 1 100MEG *SWEEP CC 0.5P 3P 0.1P
.LOAD RAIL2RAIL.IC0
wjxcom said:PROTECT
.OP 28u
.TRAN 0.1NS 30U START=0U
.AC DEC 10 1 200MEG
.LIB 'D:\EXERCISE\DESIGNOPA\CSMC06\CSMC.LIB' TT
.END
hiwjxcom said:Hi hr_rezaee: would you tell me how to use the .OP?
wjxcom said:Hi, if you use Hspice, you can perform TRAN analysis, and save the operating points of the circuit to a file, and then you can load the file and perform the AC analysis. For example, you perform TRAN analysis:
.SAVE TYPE=IC FILE=RAIL2RAIL.IC LEVEL=ALL TIME=25U
.TRAN 0.1NS 30U START=0U
and then you can perform the AC analysis
.AC DEC 10 1 100MEG *SWEEP CC 0.5P 3P 0.1P
.LOAD RAIL2RAIL.IC0
you can get the help from the Hspice manul to understand the .save and .load!
regard!
Hi, if you use Hspice, you can perform TRAN analysis, and save the operating points of the circuit to a file, and then you can load the file and perform the AC analysis. For example, you perform TRAN analysis:
.SAVE TYPE=IC FILE=RAIL2RAIL.IC LEVEL=ALL TIME=25U
.TRAN 0.1NS 30U START=0U
and then you can perform the AC analysis
.AC DEC 10 1 100MEG *SWEEP CC 0.5P 3P 0.1P
.LOAD RAIL2RAIL.IC0
you can get the help from the Hspice manul to understand the .save and .load!
regard!
Hi hr_rezaee: the circuit, the netlist of the circuit and the simulation result can be found at the attachment whose name is simulation.rar.
when I use the netlist as follows:
.NOISE V(OUTD) VID 10
.PRINT NOISE ONOISE INOISE DB(ONOISE) DB(INOISE)
.TRAN 0.1NS 30U START=0U
.LOAD CASCODE.IC0
.SAVE TYPE=IC FILE=CASCODE.IC LEVEL=ALL TIME=25U
.PZ V(OUTD) VID
*.OPTIONS POST BRIEF NOMOD CAPTAB ACOUT=0 CSDF=2 PROBE
.PROTECT
.LIB 'D:\EXERCISE\DESIGNOPA\CSMC06\CSMC.LIB' TT
.AC DEC 10 1 60MEG *SWEEP CC 1P 10P 1P
the .lis file is cascode_opa_ac1.lis, and the wave is Aim_ Printing1.pdf;
when I use the netlist as follows:
.NOISE V(OUTD) VID 10
.PRINT NOISE ONOISE INOISE DB(ONOISE) DB(INOISE)
.TRAN 0.1NS 30U START=0U
.PZ V(OUTD) VID
*.OPTIONS POST BRIEF NOMOD CAPTAB ACOUT=0 CSDF=2 PROBE
.PROTECT
.OP 25u
.LIB 'D:\EXERCISE\DESIGNOPA\CSMC06\CSMC.LIB' TT
.AC DEC 10 1 60MEG *SWEEP CC 1P 10P 1P
the .lis file is cascode_opa_ac2.lis, and the wave is Aim_ Printing2.pdf;
It is clearly that these two results is different!
Thanx you again to help me!
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?