Limitations in modulating bandwidth and efficiency in radio frequency (RF) power amplifiers prevent reductions in size, weight, power and cooling. Class-D power amplifiers offer the highest theoretical efficiency and bandwidth of known power amplifiers. The necessity of driving a floating, high side switch has hindered their widespread implementation.
Switching power converters utilizing power switching devices in a half-bridge or full-bridge configuration are commonly operated in conditions where the active devices pass reverse current. In many cases, a schottky diode is placed in parallel with each active device to permit conduction of reverse current in a path other than the main switching devices. These schottky diodes add parasitic capacitance and inductance.
Consequently, it would be advantageous if an apparatus existed that is suitable for power switching without complicated drive circuitry.