Siemens Aktiengesellschaft

Ralf Herzberg

Jörg Nagel

Mathias Kleinsorge

Roland Jenkins

Werner Kupka

The present invention relates to a method for adjusting the amplification of a high frequency signal, a transmitter or receiver unit and a communication system. The aim of the invention is to provide a method and device for improved use of a polar-loop concept in a transmitter, especially for a mobile radio link. According to the method for adjusting the amplification of a high frequency signal, wherein the phase angle and the amplitude of an error-free input signal are separated from each other with a defined part of an output signal and readjusted, an output voltage of a battery voltage modulator is evaluated as a measure for an error at the output of a transmitter amplifier and taken into account in order to provide a correction.

Method for controlling the gain of radio-frequency signal

A circuit is provided for regulating operation of a transmitter of a mobile communication terminal, which runs in the EDGE and GMSK modulation modes. The inventive circuit includes a power amplifier supplying an output signal for an antenna of the mobile communication terminal; a phase regulator that is provided with a phase comparator to which a setpoint signal for the output signal of the power amplifier is fed, and a voltage-controlled oscillator adjusting the phase position of the output signal of the power amplifier, the phase regulator regulating the phase position of the output signal of the power amplifier; an amplitude-regulating device that is provided with an amplitude comparator to which the setpoint signal for the output signal of the power amplifier is fed, and a battery-powered battery-voltage modulator adjusting the amplitude of the output signal of the power amplifier, the amplitude-regulating device regulating the amplitude of the output signal of the power amplifier; and a feedback line feeding an actual measured value for the output signal of the power amplifier back to the phase comparator and the amplitude comparator, the feedback line being provided with an adjustable amplifier which is controlled by a baseband chip and sets an output power of the antenna. The inventive circuit includes a changeover switch which is wired in such a way that it connects an input of the battery-voltage modulator to an output of the amplitude comparator in a first position for the EDGE mode while connecting an input of the battery-voltage modulator to an output of the power amplifier in a second position for the GMSK mode, the connection being made via the adjustable amplifier in both positions.

Circuit arrangement for switching a mobile radio transmitter between two modulation modes

A PIN diode switching system is provided, particularly for the transmission stage of a mobile radio telephone, in which, when the PIN diode switching system is in a reverse-bias state, a PIN diode is isolated from its power supply via a high-impedance switch and is, thus, biased by its self-rectification to a radio-frequency voltage in order to suppress harmonic formation and radio-frequency attenuation.

Pin diode circuit arrangement

The invention relates to a transceiver unit for operation at a first and second transmitting/receiving frequency. In particular, a transceiver unit for operation in different systems of mobile telecommunication, having exactly one power output stage for the first and second transmitting frequency, one receiving section having a first and a second input for the first and second receiving frequency, respectively, a transmitting/receiving antenna and a switchable filter element for optionally connecting the power output stage or, respectively, the first or second input of the receiving section to the transmitting/receiving antenna.

Growing community of inventors

Toenisvorst, Germany

Ralf Herzberg