摘要:
The invention relates to a method for conditioning of an envelope signal (10) to be provided as an input signal to an envelope tracking, ET, modulator, comprising: advancing the envelope signal (10) in the time domain at rising edges thereof for reducing a negative deviation between an output signal (12) of the ET modulator and the envelope signal (10). The invention also relates to a computer program product, to a frontend for a base station, to a base station, and to a communications network adapted for performing the method.
摘要:
The invention relates to a method for amplifying a carrier signal (CS1) by using a power amplifier (PA1), the power amplifier (PA1) is feed with a supply voltage (PASV1) of a power supply (SMPS1). The method comprises the step of adapting a value of the supply voltage (PASV1) to a value related to a mean signal power of an input signal (DS) of a power amplifier system (PAS1).
摘要:
The invention relates to a Switch Mode Assisted Linear Amplifier (1), SMALA, for amplification of a baseband input signal (V S ), comprising: a linear stage (2) adapted to perform linear amplification of the baseband input signal (V s ), a hysteretic control stage (7) for generating a pulse-width modulated signal (V sw ) from a current (I lin ) produced by the linear stage (2), and a switching stage (8) adapted to amplify the pulse-width modulated signal (V sw ) to generate a further current (I sw ) which is added to the current (I lin ) of the linear stage (2). The hysteretic control stage (7) comprises a high-precision Schmitt trigger (7b) with two high-speed comparators, preferably having a rise time of less than ten nanoseconds, and with a RS flip-flop for generating a pulse-width modulated signal (V sw ) being well-defined over the entire amplified baseband frequency range.
摘要:
The invention relates to an envelope tracking arrangement (1), comprising: at least two power transistors (5a, 5b) for amplification of an RF signal (2), and a modulator (8) for generating a modulated supply voltage M for the power transistors (5a, 5b), wherein the envelope tracking arrangement (1) is adapted to selectively provide the modulated supply voltage (V) to one or more of the power transistors (5a, 5b) based on a relation between a required output power and an overall maximum output power of the power transistors (5a, 5b). The invention also relates to a base station (16) and to a wireless communications network (18) comprising such an envelope tracking arrangement (1), as well as to a corresponding method.
摘要:
The present invention relates to an envelope tracking RF power amplifier unit (80), comprising: an RF power transistor unit (20) for amplification of an RF input signal (RF in), and an envelope tracking modulator (100) for feeding a supply voltage (Drain supply) to the RF power transistor unit (20), wherein the RF power transistor unit (20), preferably also the envelope tracking modulator (100), is unpackaged, and wherein the envelope tracking modulator (100) and the RF power transistor unit (20) are arranged on a common circuit board, in particular on an common RF line card (120). The invention also relates to a base station (300) comprising at least one envelope tracking RF power amplifier unit (80), to a communication network (400) comprising at least one such RF base station, and to a method for power amplification of an RF input signal (RF in). The benefit of this approach is that parasitics caused by a packaged RF power amplifier circuit may be dispensed with, thus allowing to improve overall envelope tracking performance and, possibly, to achieve an improved feeding of a driver transistor stage and of a final transistor stage of the RF power transistor unit by the same modulator (100).
摘要:
The invention relates to a method of operating a control unit (100) for controlling an operation of a power amplifier (PA), wherein said power amplifier (PA) is configured to amplify a radio frequency, RF, signal (S RF ) that is obtained from at least two input signals (S1, S2), wherein a control signal (CTRL) for influencing a supply voltage (Vsup) of said power amplifier (PA) is determined by digital signal processing means (DSP) of said control unit (100) depending on said at least two input signals (S1, S2).