The following figure shows what happens if the resistance of the load is decreased to 800 Ω. The
DUT load line for 800 Ω intersects the current compliance limit line, which places the SMU in
compliance. When in compliance, the SMU cannot source its programmed voltage (10 V). For the
800 Ω DUT, the SMU only outputs 8 V (at the 10 mA limit).
Notice that as resistance decreases, the slope of the DUT load line increases. As resistance
approaches infinity (open output), the SMU sources virtually 10 V at 0 mA. Conversely, as resistance
increases, the slope of the DUT load line decreases. At zero resistance (shorted output), the SMU
sources virtually 0 V at 10 mA.
Figure 68: Voltage source operation in current compliance
The following figure shows what happens if a power limit of 60 mW is applied. As the SMU attempts
to output the programmed source value of 10 V, the power compliance limit line is reached, which
places the SMU in power compliance. The SMU enforces the power compliance limit by setting the
current compliance limit line to the new power-limited current compliance limit line setting, which in
this example is 6 mA. In compliance, the SMU cannot source its programmed voltage (10 V). For the
800 Ω DUT, the SMU outputs 4.8 V at the 5 mA limit. In this example, current never exceeds the
programmed compliance of 10 mA or the programmed power compliance of 60 mW under any load.
To Next Page
Loading...
Need help?
General
