S530 Parametric Test System Test Subroutine Library User's Manual
Section 3: Test subroutine library reference
S530-907-01 Rev. A / September 2015
3-25
Details
W is calculated using the following equation:
L = ((Slope
2
/ Slope
1
) W
1
- W
2
) / (Slope
2
/Slope
1
- 1.0)
The
npts
parameter must be greater than 5. If a value less than 5 is used, the subroutine uses 5
points by default.
Source-measure units (SMUs)
See the
(on page 3-76) subroutine.
Example
result = deltw1(d1, g1, s1, sub1, w1, d2, g2, s2, sub2, w2, vlow, vhigh, vds,
vbs, ithr, vstep, npts, &kflag)
ev
This subroutine calculates the early voltage at constant base-emitter current (IBE).
Usage
void ev(int e, int b, int c, int sub, double ibe, double vstart, double vstop, int
npts, double vsub, double *slope, double *iflag, double *r, double *early);
e
Input
The emitter pin of the device
b
Input
The base pin of the device
c
Input
The collector pin of the device
sub
Input
The substrate pin of the device
ibe
Input
Forced base current, in amperes
vstart
Input
The start of the collector-emitter voltage (VCE) sweep
vstop
Input
The end of the VCE sweep
npts
Input
The number of points in the sweep
vsub
Input
Substrate bias, in volts
slope
Output
The calculated inductance
iflag
Output
Status flag:
0 = Normal completion
1 = No valid data for fit
2 = Calculated slope = 0.0
3 = Developed base voltage is within 98 % of the 3 V voltage limit
r
Output
Correlation coefficient
early
Output
Calculated early voltage
