Eads Deutschland Gmbh

Airbus Defence and Space Gmbh

Hardy Sledzik

Rolf Reber

Joerg Schroth

Rainer Rittmeyer

Jörg Schroth

In a method and apparatus for compensating for gain changes in an amplifier circuit comprising radio-frequency modules and attenuation elements, a radio-frequency module is driven with a first temperature-dependent monitoring voltage U(T), and an attenuation element with a second temperature-dependent monitoring voltage U(T). The first temperature-dependent monitoring voltage U(T) is produced by applying a temperature dependency to an individual monitoring voltage U, which is predetermined for a predetermined temperature for a radio-frequency module, in order to set the optimum operating point of the radio-frequency module. The second temperature-dependent monitoring voltage U(T) is produced by applying a temperature dependency to a predetermined monitoring voltage Ufor the attenuation element. The monitoring voltage Uis determined in an iteration method, such that the output power of the amplifier circuit reaches a predeterminable level at a constant input power. Memory devices are provided for storing values for producing monitoring voltages for the radio-frequency modules and attenuation elements.

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Blaustein, Germany

Hardy Sledzik