Keithley 4200A-SCS, Справочное руководство

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Section 5: Pulse measure and pulse generator units Model 4200A-SCS Parameter Analyzer Reference Manual
5-64 4200A-901-01 Rev. C / February 2017
Example 4: Maximum voltage and current, high speed range
V = I * R
V
MAX
= 10 V for high speed range
R
DUT
= 5
Ω
I
MAX
= V
MAX
/ / R
TOTAL
= V
MAX
/ (R
pulse generator
+ R
DUT
)
I
MAXDUT
= 10 V / (50 Ω + 5 Ω) = 10 V / 55 Ω = 0.182 A
V
MAXDUT
= I
MAX
* R
DUT
= 0.182 A * 5
Ω = 0.91 V
These I
MAX
and V
MAX
values match the values in the Pulse Card High Voltage (5 V) Range table for
the 5 Ω row (see next table). Note that these calculations do not incorporate any cabling or
interconnect losses that may range from 1 Ω up to 10 to 20 Ω, depending on the interconnect method
and DUT type (packaged or on-wafer).
Example 5: Maximum voltage and current, high voltage range
V = I * R
V
MAX
= 40 V for High Voltage Range
R
DUT
= 250 Ω
I
MAX
= V
MAX
/ / R
TOTAL
= V
MAX
/ (R
pulse generator
+ R
DUT
)
I
MAXDUT
= 40 V / (50 Ω + 250 Ω) = 40 V / 300 Ω = 0.133 A
V
MAXDUT
= I
MAX
* R
DUT
= 0.133 A * 250 Ω = 33.3 V
These I
MAX
and V
MAX
values match the values in the Pulse Card High Voltage (20 V) Range table for
the 250 Ω row. These calculations do not incorporate any cabling or interconnect losses that may
range from 1 Ω up to 10 to 20 Ω, depending on the interconnect method and DUT type (packaged or
on-wafer).
The tables below show the maximum current and voltage for various R
DUT
values for the two output
ranges available on each pulse card channel. Note the calculated current and voltage values do not
include any cabling or interconnect losses that reduce both the maximum available V
DUT
and I
DUT
.
Because V
DUT
is a function of the load applied to the pulse card channel, this effect is sometimes
called the load-line effect. There are several ways of working with this effect. The simplest one is to
program the DUT load into the pulse card channel using the
pulse_load (on page 13-145) command,
or setting the Pulse Load value in the KPulse (on page 10-1) virtual front panel. The pulse card will
calculate the appropriate V
INT
to output so that the V
DUT
pulse waveform, specified by
pulse_vlow
and
pulse_vhigh
, has the correct levels. For details, see Coping with the load-line effect (on page
5-36).