Abstract: Apparatus (1) comprises envelope signal amplification circuitry (11) configured to receive an input envelope signal (ENV_in) indicative of an envelope of an input radio frequency signal (RF_in) and to output an amplified envelope signal (ENV_amp); and a radio frequency power amplifier (12) configured to receive a radio frequency control signal which is dependent on the input radio frequency signal(RF_in) and the input envelope signal (ENV_in), using the amplified envelope signal (ENV_amp) as its supply voltage, to output an amplified radio frequency signal (RF_amp). A method for amplification the radio frequency signal is also provided.

Abstract: The subject matter described herein relates to supply modulation for power amplification. In one embodiment, the voltage level of the envelope with a tunable threshold voltage. The high level part of the envelope above the threshold voltage is maintained and amplified, for example, by the linear amplification process. On the other hand, the low level part of the envelope is replaced with the constant low voltage level. In amplification, the shaped low level part can be prompted to the predefined low supply voltage which may be directly output to the RFPA. By eliminating complicated amplification process on the lower level part of the envelope, the efficiency and bandwidth of the supply modulation can be improved and the circuitry can be simplified, without introducing any timing mismatch or delays.

Abstract: Embodiments of the invention provide an apparatus for amplifying a radio frequency transmission signal, comprising: an envelope signal obtaining unit (210) configured to obtain a slow envelope signal indicating a time averaging amplitude component of the radio frequency signal and a fast envelope signal indicating an instant amplitude component of the radio frequency signal; a supply voltage modulating unit (230) configured to provide an output modulated supply voltage to the power amplifying unit by modulating a direct current supply voltage based on both the slow envelope signal and the fast envelope signal; and a power amplifying unit (220) configured to amplify power of the radio frequency transmission signal according to the output modulated supply voltage.

Abstract: The subject matter described herein relates to envelope shaping in envelope tracking power amplification. A method, apparatus and computer storage medium are provided for envelope shaping in envelope tracking power amplification. In an embodiment, the method comprises performing an envelope shaping operation on reference envelope signals in a time domain to obtain shaped envelope signals; performing a signal quality control on the shaped envelope signals in a frequency domain; and converting the shaped envelope signals from the frequency domain into the time domain to obtain resulting shaped envelope signals. In such a way, a better signal quality can be provided without any modifications to the receiver side. And in turn, the PAPR of the envelope signal may be reduced before entering into a supply modulator and the efficiency of the ET supply modulator could be improved. As a result, the ET PA system performance can be enhanced.

Abstract: This disclosure relates generally to the field of wireless communication infrastructure, and more particularly to a method, apparatus and system for envelope tracking. The system for envelope tracking comprising: a transistor; an RF transistor; a driver; a switcher current source; and a subtracting network; wherein the system is configured such that when an envelope voltage is less than a predetermined voltage value, the RF transistor is configured for decreasing an amount of absorbed biasing current, and when the envelope voltage is greater than a predetermined voltage value, the RF transistor is configured for increasing an amount of absorbed biasing current. The goal of RF transistor sinking is to absorb the redundant biasing current generated by the envelope tracking supply modulator to eliminate distortions.

Abstract: Power amplifiers for amplifying a radio frequency signal are provided.

Abstract: The subject matter described herein relates to supply modulation for power amplification. In one embodiment, the voltage level of the envelope with a tunable threshold voltage. The high level part of the envelope above the threshold voltage is maintained and amplified, for example, by the linear amplification process. On the other hand, the low level part of the envelope is replaced with the constant low voltage level. In amplification, the shaped low level part can be prompted to the predefined low supply voltage which may be directly output to the RFPA. By eliminating complicated amplification process on the lower level part of the envelope, the efficiency and bandwidth of the supply modulation can be improved and the circuitry can be simplified, without introducing any timing mismatch or delays.

Abstract: The subject matter described herein relates to envelope shaping in envelope tracking power amplification. A method, apparatus and computer storage medium are provided for envelope shaping in envelope tracking power amplification. In an embodiment, the method comprises performing an envelope shaping operation on reference envelope signals in a time domain to obtain shaped envelope signals; performing a signal quality control on the shaped envelope signals in a frequency domain; and converting the shaped envelope signals from the frequency domain into the time domain to obtain resulting shaped envelope signals. In such a way, a better signal quality can be provided without any modifications to the receiver side. And in turn, the PAPR of the envelope signal may be reduced before entering into a supply modulator and the efficiency of the ET supply modulator could be improved. As a result, the ET PA system performance can be enhanced.

Abstract: Apparatus (1) comprises envelope signal amplification circuitry (11) configured to receive an input envelope signal (ENV_in) indicative of an envelope of an input radio frequency signal (RF_in) and to output an amplified envelope signal (ENV_amp); and a radio frequency power amplifier (12) configured to receive a radio frequency control signal which is dependent on the input radio frequency signal(RF_in) and the input envelope signal (ENV_in), using the amplified envelope signal (ENV_amp) as its supply voltage, to output an amplified radio frequency signal (RF_amp). A method for amplification the radio frequency signal is also provided.

Abstract: Methods and apparatus are provided for amplifying an input signal. An electronic circuit system comprises a first circuit comprising a power amplifier, configured to receive a first branch of an input signal, and generate a first amplified signal based on the input signal of the first branch; a second circuit, configured to receive a second branch of the input signal, generate a cancellation signal based on the input signal of the second branch, and combine the first amplified signal and the cancellation signal to generate a second amplified signal. The second circuit comprises an interference re-construction module, which is configured to model an inverse characteristic of residual distortion and interference of the first circuit via a predefined re-construction function, and generate an anti-phased interference signal based on the input signal of the second branch and the predefined re-construction function. The cancellation signal is generated from the anti-phased interference signal.

Abstract: Methods and apparatus are provided for amplifying an input signal. An electronic circuit system comprises a first circuit comprising a power amplifier, configured to receive a first branch of an input signal, and generate a first amplified signal based on the input signal of the first branch; a second circuit, configured to receive a second branch of the input signal, generate a cancellation signal based on the input signal of the second branch, and combine the first amplified signal and the cancellation signal to generate a second amplified signal. The second circuit comprises an interference re-construction module, which is configured to model an inverse characteristic of residual distortion and interference of the first circuit via a predefined re-construction function, and generate an anti-phased interference signal based on the input signal of the second branch and the predefined re-construction function. The cancellation signal is generated from the anti-phased interference signal.