Humungus said:Set a reasonable initial condiction
it no use。tlihu said:Do I need to set ".OPTION METHOD=GEAR"?
ysz said:MY SIM FILE:
vdd vdd gnd pwl(0u 0v 5000u 3v)
.option post=2
.tran 1u 200000u
.lib 'MYLIB.lib' tt
MP2 OSC2 OSC1 VDD VDD PCH L=2U W=400U
MN2 OSC2 OSC1 0 0 NCH L=2U W=200U
RF OSC1 OSC2 15000K
R1 OSC1 N1N13 30K
C1 N1N13 N1N55 0.003P
L1 N1N55 OSC2 7863H
CO OSC1 OSC2 1.5P
CL2 OSC2 0 8P
CL1 OSC1 0 8P
.END
IT HAS CORRECT FREQ, BUT VPP ONLY 1MV, WHO CAN HELP ME?
r23718 said:changing 1u to 100n in .tran 1u 200000u
will not help - it is "initial" sep size. Simulator will then change step size to anything.
Accuracy and DELMAXr23718 said:changing 1u to 100n in .tran 1u 200000u
will not help - it is "initial" sep size. Simulator will then change step size to anything. It is a good idea to limit step size in case you do not see any oscillation. This could be done by setting option (usually) maxstep=100n which obviously sets max step allowed.
If there IS a small oscillation then you need to wait for building it up - run overnight. To speed up startup you can initial current through L in its netlist definition Ic=1u - this will kick it up. Or you can set voltage on both L ends bu .IC (perhaps VCC/2). If oscillation dies you do not have good one. If it continues it will still take a long time to settle to its natural freq.
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?