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Keithley S530 User Manual

Keithley S530
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S530 Parametric Test System Test Subroutine Library User's Manual Section 3: Test subroutine library reference
S530-907-01 Rev. A / September 2015 3-69
vp1
This subroutine estimates the voltage at which the current flow between the source and drain is blocked
("pinched-off") for a metal-semiconductor field-effect transistor (MESFET) at a specified "pinch-off" current and
drain-source voltage (V
DS
).
Usage
void vp1(int d, int g, int s, int sub, double ids, double vdlim, double vg1, double
vg2, double iglim, double *iflag, double *vp)
d
Input
g
Input
s
Input
sub
Input
ids
Input
vdlim
Input
vg1
Input
vg2
Input
iglim
Input
iflag
Output
Return status flag:
Returns
Output
Details
This subroutine is a variant of the vp subroutine. The trigger is set to the specified V
DS
and pinch-off
current (I
P
) is forced on the drain. The gate voltage is then searched until the V
DS
value is reached. At
0 V gate-source voltage (V
GS
), the drain voltage is below the specified V
DS
. As V
GS
is increased, V
DS
increases as the device approaches the voltage at which the current flow between the source and
drain is blocked.
If a positive substrate pin is specified, the substrate is grounded. If a positive substrate pin is not
specified, the substrate is left floating.
A delay is incorporated into the vp1 subroutine; this delay is the calculated time required for stable
forcing of drain-source current (I
DS
) with the V
DS
voltage limit.
V/I polarities
vg1, vg2 - Ensures that polarity forward biases the gate-source diode. Starting voltage, vg1, must
allow the drain SMU to supply pinch-off current without exceeding the limit.
Source-measure units (SMUs)
SMU1: Forces drain-source current (ids), programmable voltage limit, trigger set to V
DS
SMU2: Searches V
GS
, programmable current limit

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Keithley S530 Specifications

General IconGeneral
BrandKeithley
ModelS530
CategoryTest Equipment
LanguageEnglish

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