With multiple SMUs in parallel, the source offsetsmay add and become quite significant, so you need to measure the actual voltageoutput, not just the voltage that you've programmed. By using four-wire ...

The low-voltage surface-mount IC labeled U1—a step-down dc-dc converter with built-in MOSFETs and a synchronous rectifier—forms a simple and highly efficient 2-V source. Feedback resistors R1 ...