S530 Parametric Test System Test Subroutine Library User's Manual
Section 3: Test subroutine library reference
S530-907-01 Rev. A / September 2015
3-65
Details
Drain voltage is forced and a binary search is done on V
GS
, starting with the two input values of V
GS
(
vglo
and
vghi
). The binary search is controlled by two parameters: The error estimate (
errpct
)
and the maximum number of iterations (
maxitr
). Error codes are returned based on the results of
the search.
If a zero or negative substrate pin is specified, the substrate is left floating. If the pin number is
greater than 0 and V
BS
is less than 0.9 mV, the substrate is grounded. In all other cases, it is
connected and forced.
V/I polarities
The polarities of V
GS
, V
DS
, and V
BS
are determined by device type.
Source-measure units (SMUs)
SMU1: Forces
vds
, default current limit, measures I
DS
SMU2: Searches V
GS
, current limit set to (1.25 *
idspec
)
SMU3: Forces
vbs
, default current limit
Example
result = vg2(d, g, s, sub, type, idspec, errpct, vds, vbs, vglo, vghi, maxitr,
&idmeas, &istat)
Schematic
