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: 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 supplying the low-level components (224) to a power amplifier (206) whose gain is controlled depending on the amplified high-level components (222).

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: 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 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: 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).