This performs a DC analysis while sweeping the DC value of a source. It is useful for computing the DC transfer function of an amplifier or plotting the characteristic curves of a transistor for model verification.
Syntax: .dc <srcnam> <Vstart> <Vstop> <Vincr>
+ [<srcnam2> <Vstart2> <Vstop2> <Vincr2>]
The <srcnam> is either an independent voltage or current source that is to be swept from <Vstart> to <Vstop> in <Vincr> step sizes. In the following example, the default BSIM3v3.2.4 characteristic curves are plotted:
* Example .dc sweep
*
M1 2 1 0 0 nbsim
Vgs 1 0 3.5
Vds 2 0 3.5
.dc Vds 3.5 0 -0.05 Vgs 0 3.5 0.5
.model nbsim NMOS Level=8
.save I(Vds)
.end