Self-recovering short-circuit protection circuit for RF class-D power amplifier

The paper presents a self-recovering short-circuit protection circuit for RF class-D power amplifier whose output is connected to a 50Ohm load in 24V power supply. The circuit can make the output MOS power transistors shut down quickly when short-circuit occurs. Moreover, those transistors also can be voluntarily started-up again once short-circuit disappears. Fabricated in CSMC 0.25μm enhance BCDMOS process, the circuit can work stably and accurately under all kinds of short-circuit condition. The analysis and design methods discussed in this paper can provide beneficial references for other kinds of chip about short-circuit protection technological.