I am working on bandgap voltage reference circuit(very much the same as shown in fig) and use a variant of spice for simulations, since I am not  sure that simulator is capable of simulating selfbiased circuits,  I started using .IC statements for avoiding the problem  of startup(as amp here is self biased).

in the fig shown below  I initialise the nodes biasp to 0V and n18 to vdd (as they move in opposite directions in an all zero soln when it fails to startup)

doing so i was not successful always, still it fails to give a correct op soln to the circuit. it settles in an intermediate op pt in which nodes are neither at 0,vdd(all zero soln) nor at the correct op pt i expect.


Is this way of using .IC for avoiding startup correct?  does this have any issues?
OR
does this circuit really have another stable op pt ? if so how to avoid it?


thanks,
vamshi

yes i am aware of that, i was taking about transient simulations only.

thanks,
vamshi

thanks for the reply ic_engr,

probably i should try with a startup circuit as well.


thanks
vamshi