A low power radio frequency (RF) signal detector comprising a set of transistors, a bias input circuitry configured to apply bias to each of the set of transistors, and a differential signal input circuitry configured to apply a pair of differential signals to the set of transistors, wherein the pair of differential signals increases or decreases bias applied to the set of transistors to achieve low power, high frequency RF signal detection.

A low power radio frequency (RF) signal detector comprising a set of transistors, a bias input circuitry configured to apply bias to each of the set of transistors, and a differential signal input circuitry configured to apply a pair of differential signals to the set of transistors, wherein the pair of differential signals increases or decreases bias applied to the set of transistors to achieve low power, high frequency RF signal detection.

A pre-distorter that both accurately compensates for the non-linearities of a radio frequency transmit chain, and that imposes as few computation requirements in terms of arithmetic operations, uses a diverse set of real-valued signals that are derived from separate band signals that make up the input signal. The derived real signals are passed through configurable non-linear transformations, which may be adapted during operation, and which may be efficiently implemented using lookup tables. The outputs of the non-linear transformations serve as gain terms for a set of complex signals, which are functions of the input, and which are summed to compute the pre-distorted signal. A small set of the complex signals and derived real signals may be selected for a particular system to match the classes of non-linearities exhibited by the system, thereby providing further computational savings, and reducing complexity of adapting the pre-distortion through adapting of the non-linear transformations.

A pre-distorter that both accurately compensates for the non-linearities of a radio frequency transmit chain, and that imposes as few computation requirements in terms of arithmetic operations, uses a diverse set of real-valued signals that are derived from separate band signals that make up the input signal. The derived real signals are passed through configurable non-linear transformations, which may be adapted during operation, and which may be efficiently implemented using lookup tables. The outputs of the non-linear transformations serve as gain terms for a set of complex signals, which are functions of the input, and which are summed to compute the pre-distorted signal. A small set of the complex signals and derived real signals may be selected for a particular system to match the classes of non-linearities exhibited by the system, thereby providing further computational savings, and reducing complexity of adapting the pre-distortion through adapting of the non-linear transformations.

An amplifier includes amplification stages connected in parallel between an input point and an output point and a feedback circuit, wherein the amplification stages each include a transistor configured to amplify a signal supplied from the input point, a harmonic processing unit configured to process harmonics present in an amplified signal output from an output node of the transistor, a connection point between the output node and the harmonic processing unit, and a transmission line connecting the connection point and the output point, wherein the feedback circuit feeds back a signal at the output point or a midway point of the transmission line of a given one of the amplification stages to a first end of a resistor connected to the connection point of the given one of the amplification stages, a second end of the resistor being connected to the connection point of another one of the amplification stages.

An amplifier includes amplification stages connected in parallel between an input point and an output point and a feedback circuit, wherein the amplification stages each include a transistor configured to amplify a signal supplied from the input point, a harmonic processing unit configured to process harmonics present in an amplified signal output from an output node of the transistor, a connection point between the output node and the harmonic processing unit, and a transmission line connecting the connection point and the output point, wherein the feedback circuit feeds back a signal at the output point or a midway point of the transmission line of a given one of the amplification stages to a first end of a resistor connected to the connection point of the given one of the amplification stages, a second end of the resistor being connected to the connection point of another one of the amplification stages.

A power amplifier arrangement (200) for amplifying an input signal to produce an output signal comprises a plurality N of amplifier sections (212, 213), a first input transmission line (221) comprising multiple segments and a first output transmission line (231) comprising multiple segments. Each amplifier section comprises one or more first transistors (T1) distributed along the first input transmission line (221) and the first output transmission line (231). Each amplifier section is configured to amplify a portion of the input signal to produce a portion of the output signal. A portion of the input signal is one of N portions of the input signal partitioned on any one or a combination of an amplitude basis and a time basis. The output signal is produced at an end of the first output transmission line (231) by building up N potions of the output signal from each amplifier section.

Various embodiments disclose a method and a device including: an antenna, a switching regulator, communication chip including an amplifier and a linear regulator operably connected to the amplifier and the switching regulator, the communication chip configured to transmit a radio-frequency signal from the electronic device through the antenna, and control circuitry configured to control the communication chip such that the linear regulator provides the amplifier with a voltage corresponding to an envelope of an input signal input to the amplifier, the input signal corresponding to the radio-frequency signal.

Various embodiments disclose a method and a device including: an antenna, a switching regulator, communication chip including an amplifier and a linear regulator operably connected to the amplifier and the switching regulator, the communication chip configured to transmit a radio-frequency signal from the electronic device through the antenna, and control circuitry configured to control the communication chip such that the linear regulator provides the amplifier with a voltage corresponding to an envelope of an input signal input to the amplifier, the input signal corresponding to the radio-frequency signal.

A digital power amplifier comprising two or more individually activatable amplifiers. The outputs of the amplifiers are connected causing an activated amplifier of the two or more amplifiers to load modulate another activated amplifier of the two or more amplifiers.