The AMMP-6640-TR2G IC is driven by voltage ramps placed on Vseries and Vshunt control pins. Operation in this mode requires voltages between 0 to 1.5 volts for Vse and 0 to 1.5 volts for Vsh. The recommended DC control voltage range is Vse=0 to 1.2 volts and Vsh= 0 to 1.2 volts. A simplified schematic for the HMT118SA-Q06 is shown in below figure.