Abstract: Various embodiments may provide a circuit including a radio frequency (RF) power amplification module having an RF power amplifier. The RF power amplification module may further include a directional coupler coupled with the RF power amplifier and configured to produce a power signal at a coupling port of the directional coupler corresponding to an output power of the RF power amplifier. The RF power amplification module may further include a switch coupled between the coupling terminal and a sensing path to selectively couple the coupling port with a power detector via the sensing path. The RF power amplification module may further include a termination load coupled to an isolation port of the directional coupler. Some embodiments may include a plurality of RF power amplification modules coupled together by the sensing path.

Abstract: A method and device are provided for producing mobile radio signals, which utilize a direct conversion receiver, at least one first and one second local oscillator and one regenerative divider for processing signals according to different mobile radio standards. For generating the intermediate frequency for transmission according to at least one of the mobile radio standards, a division by four in addition to a division by three of the oscillator frequency is also possible.

Abstract: A method and apparatus for controlling the power of a transmit amplifier wherein a portion of the power transmitted from the antenna is received by a coupling element and is converted via a radio-frequency detector to a DC voltage value which is used for power control, such that there is no longer any need for complex use of a directional coupler between the transmit amplifier and the antenna.

Abstract: A method is provided for operating a voltage controlled oscillator, particularly in a portable communications appliance, when the oscillator is supplied with a variable control voltage, which is taken from an operating voltage, preferably from a constant voltage source, such that the variable control voltage is supplied via a capacitor to the oscillator, and the specific additional voltage is added to the variable control voltage when required in an operating phase, with the specific additional voltage being inclined to the capacitor in a preparation phase.

Abstract: A method and device are provided for producing mobile radio signals, which utilize a direct conversion receiver, at least one first and one second local oscillator and one regenerative divider for processing signals according to different mobile radio standards. For generating the intermediate frequency for transmission according to at least one of the mobile radio standards, a division by four in addition to a division by three of the oscillator frequency is also possible.

Abstract: The invention relates to a method for operating a voltage-controlled oscillator (3). The invention also relates to an electric circuit arrangement and a phase-locked loop. The invention is characterised in that a certain additional voltage (U2) is added to the variable control voltage (U4) in an operating phase when required. Said control voltage is supplied to the oscillator (3) by means of a capacitor (2). The certain additional voltage (U2) is mounted on the capacitor (2) in a loading phase.

Abstract: Load-synchronous Doppler charge pump with an integrated series-path regulator A circuit for voltage raising for pulsed-operated loads is proposed. A capacitor CH is driven by a switching unit (2, S1) such that it is charged by a battery (1) during the time in which the load (4) is not in operation, and its voltage is added to the voltage from the battery (1) during operation of the load (4). The switching unit has a transistor (2) whose resistance during operation of the load (4) is varied by a control circuit (3) such that the output voltage of the circuit for voltage raising corresponds essentially to a nominal value, which is supplied to the control circuit (3) and/or is integrated in the control circuit (3).