BGR showing different results in DC AND Transient simulations

[ganesh_ch]

when i simulated BGR in transient analysis and DC analysis ,results are different.Convergence Aids i defiened Node Set value ..

 

[dick_freebird]

Node setting is cheating, and if your circuit requires cheating to work
in simulation you will be busted in the real world.

If your results are way off then suspect a startup problem. If slightly off,
suspect a floating or unrealistically high impedance node somewhere that
plays with the accuracy difference between tran and dc.

 

[LvW]

when i simulated BGR in transient analysis and DC analysis ,results are different.Convergence Aids i defiened Node Set value ..

Please consider that during dc analysis - in contrast to TRAN analyses - all reactive elements are disregarded (C=0, L=0).

 

[Teddy]

a) startup during transient sims
b) set transient to conservative

 

[ganesh_ch]

With out any node set and initial condition ,Its giving the solution .. but dc and transients giving different values

 

[dick_freebird]

So which one do you believe, or is that the question?

 

[leo_o2]

If your circuit has more one operating point, you might get different dc and transient.

 

[ganesh_ch]

I used independent current source to bias the the OPAMP ,so there is no startup issue..in transient simulation OPAMP is in linear ,but DC it is saturated..

 

[leo_o2]

Some bandgap structure will have three operating points.

 

[saro_k_82]

It could mean that the startup circuit is leaking after the tran has settled, while it is shut off nicely in dc. Just one of the possible cases. Need more information

 

[Teddy]

How about posting the schematic and netlist?