This configuration allows the combined SMUs to supply more current than a single SMU current
source can provide. In this example, SMU 1 and SMU 2 each supply one-half of the total current for
the SMU combination.
In this configuration, it is best practice to use only one SMU to limit the voltage output of the SMU
combination. In this example, SMU 2 limits the voltage. 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 voltage 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.
Configure two 2600B SMUs to get the maximum pulsed current level possible in Region 4:
20 A with 18 V source limit
SMU 1 configuration (sources one-half of the total pulse current):
Source function:
smua.source.func = smua.OUTPUT_DCAMPS
Source range:
smua.source.rangei = 10
Idle (bias) source level (source level at the base of pulse):
smua.source.leveli = 0
Idle (bias) source limit (source limit at base of pulse):
smua.source.limitv = 6
Pulse source level (source level at top of pulse):
smua.trigger.source.listi({10})
Pulse source limit. SMU 2 controls the source limit for the combined SMUs. Set the voltage source
limit of SMU 1 to the maximum voltage allowed in Region 4:
smua.trigger.source.limitv = 20
Output-off mode:
smua.source.offmode = smua.OUTPUT_NORMAL
Output-off function:
smua.source.offfunc = smua.OUTPUT_DCAMPS
Normal output-off voltage limit:
smua.source.offlimitv = 20
To Next Page
Loading...
Need help?
General
