An actuator including a first and second conductor on a dielectric, wherein application of a voltage to the first conductor creates a plasma, thereby modifying a fluid flow in communication with the actuator. The DC-DC converter provides an envelope power supply signal to the RF PA circuitry based on a first power supply output control signal. The image reading apparatus also includes a sheet feeder that feeds the sheet, a first transparent member with a reference surface that supports the sheet thereon, and a second transparent member that contacts the sheet fed by the sheet feeder.