Keithley S530 User Manual page 37

S530 Parametric Test System Test Subroutine Library User's Manual
Details
W is calculated using the following equation:
L = ((Slope
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
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
b
c
sub
ibe
vstart
vstop
npts
vsub
slope
iflag
r
early
S530-907-01 Rev. A / September 2015
/ Slope ) W - W ) / (Slope
2 1 1 2
vtext2 (on page 3-76) subroutine.
Input The emitter pin of the device
Input The base pin of the device
Input The collector pin of the device
Input The substrate pin of the device
Input Forced base current, in amperes
Input The start of the collector-emitter voltage (VCE) sweep
Input The end of the VCE sweep
Input The number of points in the sweep
Input Substrate bias, in volts
Output The calculated inductance
Output Status flag:
Output Correlation coefficient
Output Calculated early voltage
/Slope - 1.0)
2 1

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
Section 3: Test subroutine library reference
3-25