OVERLOAD PROTECTION DEVICE FOR INTEGRATED CIRCUIT AND INTEGRATED OVERLOAD PROTECTION CIRCUIT

摘要

The invention relates to an integrated overload protection circuit for protecting a bipolar transistor used in common transmitter configuration. According to the invention, the protection circuit comprises a bipolar transistor Q2. OF A TYPE OPPOSED TO THAT OF THE PROTECTED AMPLIFIER TRANSISTOR Q1; THE PROTECTIVE TRANSISTOR Q2 IS CONNECTED, BY ITS BASE, TO THE COLLECTOR OF THE AMPLIFIER TRANSISTOR Q1 AND BY ITS COLLECTOR, TO THE POWER SUPPLY TERMINAL WHICH IS NOT CONNECTED TO A TERMINAL V OF THE LOAD RESISTOR R OF THE PROTECTED DEVICE; THE TRANSMITTER OF THE PROTECTIVE TRANSISTOR Q2 IS PREFERABLY CONNECTED TO THE BASE OF THE PROTECTED TRANSISTOR Q1 BY A PROTECTIVE RESISTOR R; INPUTS OF THE PROTECTED TRANSISTOR Q1 ARE PROVIDED FOR THE INTERCONNECTION OF THE TRANSMITTER OF THE PROTECTIVE TRANSISTOR Q2 AND A TERMINAL OF THE RESISTANCE OF PROTECTION R. / P P THE INVENTION APPLIES IN PARTICULAR TO DIFFERENTIAL AMPLIFIERS AND OPERATIONAL. / P