Maximize Speed and Throughput
Maximize Speed and Throughput
for Semiconductor Measurements Using Source Measure Units (SMUs)
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Use a Four-Quadrant SMU Instrument Instead
of a Power Supply and Digital Multimeter
Using a Model 2657A
Using a Power Supply
Total discharge time ~ 5 msec
Total discharge time > 6 sec
Time Scale = 2 msec/div
When a typical test program
Diode Test
executes from a PC controller, it
80
continually communicates back
and forth with the test instru60
mentation. This communication
time, whether it is over GPIB,
40
LAN, USB, or some other protocol, is often one of the largest
20
contributors to slower test times.
Embedded test scripts minimize
0
this communication time by
Without Scripting
With Scripting
storing and then executing entire
test programs directly from the
instrument’s non-volatile memory. All setup,
I
decision-making, and data storage is now done from
inside the instrument itself, independent of the PC.
V test
f
By using embedded test scripts, Keithley’s
Test Script Processor (TSP®) technology enables
dramatic improvements in overall test throughput.
For example, a typical three-point diode test
runs over 60% faster using embedded
V test
R
test scripts compared to traditional
programming techniques.
The extra shield in the triax cable works with the
driven guard in the SMU instrument to virtually
eliminate the parallel current path. This enables faster
settling times and better measurement resolution.
Sourcing Voltage
V
Time Scale = 2 sec/div
Use Triax Cabling Instead of Coax Cabling
The coax cable’s signal to lo resistance causes a parallel current path that slows down settling times and
limits the low current resolution of the system.
Avg. time per part (ms)
Many semiconductor and electronic device tests involve sourcing a voltage and
measuring a current as quickly as possible. Overall test time is a function of charge time,
measure time, and discharge time, as well as the time to setup and process the test.
Traditional power supplies can only source voltage or current and cannot sink. But, a
four-quadrant SMU instrument can source and sink both voltage and current, while
simultaneously measuring voltage, current, or resistance. The SMU instrument’s fourquadrant operation speeds up the discharge time by automatically using sink mode to
quickly absorb all the charge
from the device under test
(DUT) and cabling. In additon,
by tightly integrating this source
and measure capability into
one instrument, the need for
a separate digital multimeter
(DMM) and power supply is
eliminated. This improves test
4 Quadrant SMU
2 Quadrant Power Supply
times, simplifies overall test
system design, and increases
usability.
Use Embedded Test Scripts to Minimize
Program Execution Time
measuring current
Test in Parallel with Distributed Control
Implementing parallel test techniques
to test multiple devices at the same
time maximizes parts tested per prober
touch-down or handler index, thus
boosting productivity and lowering the
cost of test.
In a traditional test system, only one
instrument at a time can execute a
measurement or communicate with the
PC controller. All other instruments in
the system sit idle until it is their turn to
communicate with the PC controller.
In a distributed test system, the
embedded test script (TSP script) is
distributed and synchronized across
multiple instruments through TSPLink® technology, a high-speed, SMUto-SMU communication bus. There
is one CPU per SMU instrument, and
each SMU instrument works together
as a coordinated system. Through
the combination of TSP and TSP-Link
technologies, measurements are
performed in parallel.
Traditional Test Systems
distributed Test Systems
Triax cables enable faster settling times and better
resolution when sourcing or measuring.
2600B System SourceMeter® SMU Instruments
n Dual- or single-channel models
n Test up to 200V and 10A pulse
n Sub-pA resolution
n TSP and TSP-Link technologies
2650A High Power System SourceMeter®
SMU Instruments
n Test up to 3kV and 100A pulse with 200W
output power
n 1µsec/point digitizer
n Sub-pA resolution
n TSP and TSP-Link technologies
© Copyright 2013 Keithley Instruments, Inc.
2450 Advanced Touchscreen
SourceMeter® SMU Instrument
n Industry-first 5-inch color
capacitive touchscreen GUI
n Test up to 200V and 1A
n Sub-pA resolution
n TSP and TSP-Link technologies
Printed in the U.S.A.
2400 SourceMeter® SMU
Instruments
n Test up to 1100V and 10A pulse
n Choose from over ten models
n pA resolution
n Entry-level price point
No. 3246 02.14
A Greater Measure of Confidence
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