Source voltage using two 2600B instruments in series
This example shows the recommended approach for setting the source and limit ranges and levels
when combining SMU voltage sources in series.
Figure 17: Source voltage using 2600B instruments in series
The following values are based on the current and voltage levels available in Region 4 of a 2601B,
2602B, or 2604B SMU, as shown in the table in Combining SMU outputs (on page 2-27). For
information about generating pulses with a 2600B, refer to Using timers to perform pulse mode
sweeps (on page 4-16).
This configuration supplies more voltage than a single SMU voltage source can provide. In this
example, SMU 1 and SMU 2 each supply one-half of the total voltage for the SMU combination. For
the back-to-back series connection shown, the total voltage of the combined SMUs is V
SMU 2
− V
SMU 1
.
To obtain a net differential voltage that is twice V
SMU 2
, the polarity of SMU 1 is set to the opposite of
the polarity of SMU 2.
In this configuration, it is best practice to use only one SMU to limit the current output of the SMU
combination. In this example, SMU 2 limits the current. A good approach for making sure that both
SMUs are set to the same source limit range, which is recommended, is to set SMU 1 to the
maximum current allowed in Region 4, then set the limit for SMU 2 ten percent lower.
A 10% source limit margin is generally recommended, but this value can be adjusted to meet the
requirements of a specific application.
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