Patent ID: 6800926
Filing Date: 2004-10-05
Classification: H01L

Abstract:
Compensation circuit for compensating the voltage potential of an isolation tub for isolating an integrated bipolar transistor that is embedded in the isolation tub, whereby the voltage potential of the isolation tub is compensated in dependency on a signal voltage emitted by the integrated bipolar transistor in such a way that the voltage differential between the emitted signal voltage and the compensated voltage potential is lower than a predetermined breakdown voltage between the integrated bipolar transistor and the isolation tub, whereby the compensation circuit exhibits an input for receiving a signal voltage emitted by the integrated bipolar transistor, an output for connecting to the isolation tub of the integrated bipolar transistor, and a compensation transistor that is set up complementary to the integrated bipolar transistor, whereby a collector terminal of the compensation transistor is connected with the output of the compensation circuit, an emitter terminal of the compensation transistor is connected with the input of the compensation circuit, and whereby a base terminal of the compensation transistor is connected to a predetermined reference potential, wherein a first resistor is provided between the emitter terminal of the compensation transistor and the input of the compensation circuit.