Current switching circuit formed in an integrated semiconductor circuit

摘要

A current switching circuit in an integrated semiconductor circuit includes a load connected to a positive power supply; a first pnp bipolar transistor having a collector electrode connected to the load, and a base electrode connected to a DC bias source and an emitter electrode; and a first n channel MOS transistor having a drain electrode connected to the emitter electrode of the first npn bipolar transistor, a source electrode connected to the ground, and a gate electrode connected to an input terminal, the first MOS transistor turning on and off in response to a voltage applied to the input terminal.