Abstract: An amplifier includes a signal input, a first, second and third amplification path. A coupling element having a first and a second output terminal is coupled to respective input terminals of the first and second amplification paths, and is coupled with a third terminal to an input terminal of the third amplification path. In a first mode of operation the coupling element provides a signal at the first and second output terminals, wherein the signal at the second output terminal comprising a phase shift with respect to the signal at the first output terminal. In a second mode of operation, the coupling element provides a signal at the third output terminal, wherein the provided signal is received at the input terminal and reflected on the first and second output terminals.

Abstract: A power amplifier circuit for amplifying an input RF signal with respect to a specified RF output power includes an input terminal for supplying the input RF signal to be amplified, an output terminal for the RF signal with the output power specified, an amplification path formed between the input terminal and the output terminal having a power amplification circuit for amplifying the RF signal, a bypass formed between the input terminal and the output terminal for the RF signal to bypass the amplification path, a control terminal for controlling the operation of the amplification path and the bypass, such that an RF signal is either passed through the amplification path or the bypass.

Abstract: The present invention generally relates to the field of automatic power control (APC) circuitries used in the analog front end of a mobile transmitter. It particularly refers to a power control circuitry (101M, 101N) and a corresponding method for controlling the power level (Pout) of an RF signal (x(t)) to be transmitted at the output port of a variable-gain power amplifier (105) by performing an additional regulation of the APC loop's reference signal (Vref). Thereby, it is proposed to increase the radiated RF power (Pout) in case a transmitting antenna (110) is mismatched to said power amplifier (105) in order to not release an ongoing call. In case there is a subject very close to the terminal antenna, the antenna load is changed and the increased reflected signal is measured.

Abstract: A filter arrangement comprises a first impedance, a second impedance and a subtractor. The first impedance comprises a first connection connected to an input of the filter arrangement and has a first resonant frequency. The second impedance comprises a first connection likewise connected to the input of the filter arrangement and has a second resonant frequency which is higher than the first resonant frequency. The subtractor comprises a first input connected to a second connection of the first impedance, comprises a second input connected to a second connection of the second impedance, and comprises a first connection of the output connected to a first output of the filter arrangement.

Abstract: A transmitting arrangement includes a matching circuit, a reference circuit and a comparator. The output of the matching circuit can be coupled to an antenna and comprises an adjustable impedance. The reference circuit is connected to an input of the matching circuit and comprises a reference impedance. Inputs of the comparator are coupled to the matching circuit and the reference circuit and its output is coupled to the adjustable impedance via a control input of the matching circuit.

Abstract: A power amplifier circuit for amplifying an input RF signal with respect to a specified RF output power includes an input terminal for supplying the input RF signal to be amplified, an output terminal for the RF signal with the output power specified, an amplification path formed between the input terminal and the output terminal having a power amplification circuit for amplifying the RF signal, a bypass formed between the input terminal and the output terminal for the RF signal to bypass the amplification path, a control terminal for controlling the operation of the amplification path and the bypass, such that an RF signal is either passed through the amplification path or the bypass.

Abstract: An amplifier arrangement is proposed which has an amplifier with adjustable amplification having an output. An impedance transformer circuit is connected to the output. Said circuit is designed for transforming a high output impedance of the adjustable amplifier into a low impedance at its output. The amplifier arrangement contains at least two switchable elements having a reactance, which elements are connected in each case by a first terminal to the output of the impedance transformer circuit, and by a second terminal to a reference potential terminal. The switchable elements are designed for changing the impedance at the output of the impedance transformer circuit depending on a switch position of a switching means. A load impedance at the output of the amplifier is consequently varied by simple means when the output level of the amplifier changes.

Abstract: Coherent modulator architectures of wireless communication devices are used for the processing of modulated RF signals. The circuitry comprises a DC/DC converter (204) which serves as an amplitude modulator, different amplification stages (204, 206, 212, 214), a bypass path (215) to selectively bypass at least one (214) of a cascade of class C, D, E, or F power amplifiers (212, 214), and an automatic power control (APC) loop (220) that guarantees power stability over time and temperature variations. To increase the efficiency of the amplification procedures needed for an amplitude modulation, the slow (narrowband) high-level components (222) and the fast (wideband) low-level components (224) of the signal representing the magnitude (I xLp (t) 1) of an I/Q modulation state (xLp (t)) are amplified in separate stages (204, 206) and are then combined by sup plying the low-level components (224) to a power amplifier (206) whose gain is controlled depending on the amplified high-level components (222).

Abstract: An amplitude modulator is provided, which has a first supply connection for supplying a supply potential and a second supply connection for supplying a ground potential. An amplifier stage with a push-pull output stage has a signal input for supplying a signal, and has a single-pole output for emitting a single-ended signal. In order to supply the push-pull output stage, the amplifier stage is connected in a supply path between the first and the second supply connection. A first controllable voltage source and a second controllable voltage source are also provided, whose control inputs are connected to a connection for control purposes by means of a differential modulation signal, and are connected between the amplifier stage and the first supply connection, or the amplifier stage and the second supply connection. Amplitude modulation is thus achieved by modulation of the supply voltage or of the supply current to the push-pull output stage.

Abstract: An antenna switch structure is provided for use in a mobile communication terminal. A first transceiver is configured to process signals of a first frequency band. A second transceiver is configured to process signals of a second frequency band. A first antenna is configured to transmit and receive wireless signals of the first frequency band. A second antenna is configured to transmit and receive wireless signals of the second frequency band. A connector is configured to releasably connect to a third antenna. A first switch is configured to selectively connect the first transceiver to the first antenna or to the connector. A second switch is configured to selectively connect the second transceiver to the second antenna or to the connector.

Abstract: A frequency synthesizer arrangement for generating signals with frequencies for UMTS and GSM/GPRS frequency bands and a mobile terminal with a respective frequency synthesizer arrangement are proposed, comprising a reference frequency source for providing a signal of constant reference frequency, a first frequency synthesizer sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a first type of frequency band, a second frequency synthesizer sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a second type of frequency band, whereby the second frequency synthesizer sub-unit further transforms the signal of the reference frequency source into a signal with an intermediate frequency, and a third frequency synthesizer sub-unit transforms the signal of the reference frequency source into an auxiliary signal with a fixed frequency which is used together with the signal of intermediate freque

Abstract: A frequency synthesiser arrangement for generating signals with frequencies for UMTS and GSM/GPRS frequency bands and a mobile terminal with a respective frequency synthesiser arrangement are proposed, comprising a reference frequency source for providing a signal of constant reference frequency, a first frequency synthesiser sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a first type of frequency band, a second frequency synthesiser sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a second type of frequency band, whereby the second frequency synthesiser sub-unit further transforms the signal of the reference frequency source into a signal with an intermediate frequency, and a third frequency synthesiser sub-unit transforms the signal of the reference frequency source into an auxiliary signal with a fixed frequency which is used together with the signal of intermediate freque