Infineon Technologies Ag

Siegfried Ganser

Stefan Beyer

An integrated circuit (IC) differential amplifier is disclosed. The differential amplifier comprises two amplifier stages each containing a transistor amplifier stage connected to one of the inputs of a push-pull input (RF , RFX ) and a cascode stage connected to one of the outputs of a push-pull output (RF , RFX ), where the cascode stages can be switched by a changeover switch (DC gain switch).

Differential amplifier

A balanced voltage reference circuit has a transistor that is operated as an emitter follower and to whose base two resistors are connected in series for beta compensation of the balanced circuit. One end of the smaller resistor which faces away from a transistor base, the smaller resistor being split into two resistor elements, is connected inside the chip to a signal point of an amplifier circuit whose operating point can be adjusted. In which case, one end of an integrated capacitance is connected, as a parallel element of an RC filter, between the two resistor elements of the smaller resistor.

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Markt Schwaben, Germany

Siegfried Ganser