The goal of this design example is to simplify the FVMC and FCMV functions of a PMU design using a SPDT switch. The FVMC configuration is useful to test a device being used as a power supply, or in continuity or leakage testing. In this configuration, the input voltage is directly applied to the DUT pin, and the current into or out of the DUT pin is converted to a voltage by a sense resistor and measured by an analog to digital converter (ADC). In the FCMV mode, an input current is forced to the DUT and the produced voltage on the DUT pin is directly measured. In this example, the PMU design is required to meet the following specifications:

• Force voltage range: –15 volts to +15 volts
• Force current range: ±5 µA to ±50 mA
• Measure voltage range: –15 volts to +15 volts
• Measure current range: ±5 µA to ±50 mA

In addition to the voltage and current requirements, fast throughput is also a key requirement in ATE because it relates directly to the cost of manufacturing the DUT.