Beta3A - Keithley S530 User Manual

Section 3: Test subroutine library reference

beta3a

This subroutine calculates beta () at collector-emitter voltage (V
searchi and trig LPTLib functions to search base-emitter current (I
device is in the common-emitter configuration.
Usage
double beta3a(int e, int b, int c, int sub, double ice, double vce, double ibe1,
double ibe2, double vsub, double *ibe, double *cmeas, double *error);
e
b
c
sub
ice
vce
ibe1
ibe2
vsub
ibe
icmeas
error
Returns
Details
This subroutine sets the current trigger on SMU1 at the specified I
until the trigger is set. The base current is then forced, the collector current measured, and  is
calculated.
The percent error (error) is calculated between the target I
returned.
If a zero or negative substrate pin is specified, the substrate is left floating. If the pin number is
greater than 0 and V
connected and forced.
V/I polarities
NPN +I , +V
CE
PNP -I , -V
CE CE
3-6
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 The targeted collector current, in amperes
Input The forced collector-emitter voltage, in volts
Input
The start of the base-emitter current (I
Input
The end of the base-emitter current (I
Input The forced substrate bias, in volts
Output The final measured emitter-base current
Output The final measured collector-emitter current
Output
The percent error between the target collector current (I
measured collector current (I
Output The calculated beta:
-1.0 = Target I
-2.0 = Base voltage limit reached
is less than 0.9 mV, the substrate is grounded. In all other cases, it is
SUB
, +I -V
CE BE, SUB
, -I , -V
BE SUB
S530 Parametric Test System Test Subroutine Library User's Manual
) and collector-emitter current (I
CE
) until the target I
BE
)
CMEAS
= 0.0
CE
and the final measured I
CE
) using the
CE
is reached. The
CE
) search, in amperes
BE
) search, in amperes
BE
) and the final
CE
. The base current is searched
CE
and
CE
S530-907-01 Rev. A / September 2015