Spice3f5

MOSFET output characteristics (BSIM4)

A family of BSIM4 drain current curves from a nested DC sweep.

The output characteristics of a 0.36µm/0.18µm NMOS transistor using BSIM4 (LEVEL=54, which Spice3f5 accepts as level 14). A nested DC sweep steps the gate voltage from 0 to 2V for each drain voltage sweep; vids, a 0V source in series with the drain, measures the current.

0100µ200µ300µ400µ0500m11.52sweep (V)i(vids), sweep 1i(vids), sweep 2i(vids), sweep 3i(vids), sweep 4i(vids), sweep 5i(vids), sweep 6i(vids), sweep 7i(vids), sweep 8i(vids), sweep 9i(vids), sweep 10i(vids), sweep 11
Drain current against drain voltage
  • i(vids), sweep 1
  • i(vids), sweep 2
  • i(vids), sweep 3
  • i(vids), sweep 4
  • i(vids), sweep 5
  • i(vids), sweep 6
  • i(vids), sweep 7
  • i(vids), sweep 8
  • i(vids), sweep 9
  • i(vids), sweep 10
  • i(vids), sweep 11

The circuit: examples/mosDC.cir

* MOS output characteristics
.model nmos4 nmos level=54 version=4.6.5
vds 3 0 dc 0
vgs 2 0 dc 0
* vids measures current
vids 3 1 dc 0
m1 1 2 0 0 nmos4 w=0.36u l=0.18u
*
.control
dc vds 0 2 .01 vgs 0 2 0.2
plot i(vids)
.endc
.end

Run it with spice mosDC.cir, or open it with File › Load netlist in the Qt window. The plots and output above were made by util/mkexamples.py, which runs the deck in batch mode. All examples