Abstract: An apparatus for controlling the generation of a radio frequency transmit signal includes a control module configured to control at least one power amplifier stimulus of a power amplifier module based on information related to at least one intermodulation product caused during generation of an amplified radio frequency transmit signal amplified by the power amplifier module. The amplified radio frequency transmit signal has at least two spectral clusters allocated for data transmission.

Abstract: An amplifier circuit includes a gain controller, a first amplifier, and a second amplifier which is coupled in series to the first amplifier, the second amplifier comprising a plurality of amplifying units. The gain controller is configured to receive a desired gain value and provide, based on the received desired gain value, a gain adjust signal to the first amplifier, and activate, based on the received desired gain value, a certain combination of amplifying units of the plurality of amplifying units of the second amplifier, such that a combined gain of the first amplifier and the active amplifying units of the second amplifier corresponds to the received desired gain value.

Abstract: An amplifier circuit includes a gain controller, a first amplifier, and a second amplifier which is coupled in series to the first amplifier, the second amplifier comprising a plurality of amplifying units.