Infineon Technologies Ag

Werner Simburger

Marc Tiebout

Wilhelm Wilhelm

Hans-Dieter Wohlmuth

Thomas Liebermann

Jorg Langenberg

Peter Wegar

Integrated circuit including a mixer circuit, which has a first circuit section, a second circuit section, and a transformer. The first circuit section has two radiofrequency terminals. The second circuit section has two reference oscillator terminals, an active mixer unit with a signal-amplifying unit, and two intermediate frequency terminals. The active mixer unit and the signal-amplifying unit have a common current path. The transformer directly electrically decouples the two radiofrequency terminals from the active mixer unit, and couples the first circuit section and the second circuit section together such that each of the two circuit sections is separately supplied with a full operating voltage of the integrated circuit. The integrated circuit may additionally include a second transformer connected between the active mixer unit and the two intermediate frequency terminals.

Integrated circuit having a mixer circuit

According to the invention, the high-frequency power amplifier is characterised in that the power transistor is switched in such a way that said transistor is operated in the breakdown region and that a control loop is provided. Charge carriers that are produced is the breakdown region are carried away from an output of the operational amplifier by means of said control loop.

Power amplifier and a method for operating a power amplifier

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Haar, Germany

Werner Simburger