Power amplification system with variable supply voltage. A power amplification system can include a power amplifier and a boost converter configured to provide a supply voltage to the power amplifier. The power amplification system can include a control system configured to provide a boost converter control signal to the boost converter to adjust the supply voltage based on a parameter associated with the power amplifier.

The invention relates to a radio frequency assembly comprising a radio frequency circuit comprising at least one group of N≥2 amplifiers (A1, A2) disposed in series on a substrate (1), said assembly comprising a package (2) wherein the substrate (1) is disposed, each amplifier comprising a local grounding point (b1, b2, b3) and a local feed point (a1, a2, a3), said common grounding points being connected to a common ground (GND) outside the package (2), said common feed points being connected to a common power supply (VDD) outside the package, said assembly comprising at least N−1 parallel LC circuits disposed between the common power supply (VDD) and the local feed point (a2, a3) of an amplifier (A2) so as to attenuate the current loops between two amplifiers in series.

A low frequency loss correction circuit that improves the efficiency of a power amplifier at near-DC low frequencies The low frequency loss correction circuit can include a signal error detection circuit configured to produce an error signal in response to detecting one or more frequency components of a tracking signal below a cutoff frequency that are substantially attenuated through a capacitive path. The low frequency loss correction circuit can include a drive circuit configured to convert the error signal into a low frequency correction signal, and provide the low frequency correction signal to a voltage supply line, the low frequency correction signal including at least some of the one or more frequency components of the tracking signal below a cutoff frequency that are substantially attenuated through the capacitive path.

A power amplifier module can be formed that includes metamaterial matching circuits. This power amplifier module can be included as part of a front-end module of a wireless device. The front-end module can replace a passive duplexer with an active duplexer that uses the power amplifier module in combination with a low noise amplifier circuit that can include a metamaterial matching circuit. The combination of PA and LNA circuits that utilize metamaterials can provide the functionality of a duplexer without including a stand-alone or passive duplexer. Thus, in certain cases, the front-end module can provide duplexer functionality without including a separate duplexer. Advantageously, in certain cases, the size of the front-end module can be reduced by eliminating the passive duplexer. Further, the loss introduced into the signal path by the passive duplexer is eliminated improving the performance of the communication system that includes the active duplexer.

Provided is a power amplification circuit that includes: an amplifier that amplifies an input signal and outputs an amplified signal; a first bias circuit that supplies a first bias current or voltage to the amplifier; a second bias circuit that supplies a second bias current or voltage to the amplifier; a first control circuit that controls the first bias current or voltage; and a second control circuit that controls the second bias current or voltage. The current supplying capacity of the first bias circuit is different from the current supplying capacity of the second bias circuit.

Provided is a power amplification circuit that includes: an amplifier that amplifies an input signal and outputs an amplified signal; a first bias circuit that supplies a first bias current or voltage to the amplifier; a second bias circuit that supplies a second bias current or voltage to the amplifier; a first control circuit that controls the first bias current or voltage; and a second control circuit that controls the second bias current or voltage. The current supplying capacity of the first bias circuit is different from the current supplying capacity of the second bias circuit.

An amplifier includes: a circuit pattern providing a plurality of signal paths having different lengths; a transistor chip; a plurality of pads of transistor cells, the pads being electrically connected to the circuit pattern and being arranged on the transistor chip; a plurality of the transistor cells; a plurality of transmission lines for connecting each of the plurality of pads and each of the plurality of transistor cells, the transmission lines being arranged on the transistor chip, and a plurality of harmonic processing circuits each connected to each of the plurality of transmission lines and arranged on the transistor chip. The plurality of harmonic processing circuits each has a capacitor and an inductor, and a product of the capacitance of the capacitor and the inductance of the inductor is made constant in each of the plurality of harmonic processing circuits.

In some embodiments, a power amplification system can comprise a current source, an input switch configured to alternatively feed current from the current source to a high-power circuit path and a low-power circuit path, and a band switch including a switch arm for switching between a plurality of bands. Each of the high-power circuit path and the low-power circuit path can be connected to the switch arm.

An inductor isolation apparatus and method to reduce interaction between inductors on an integrated circuit.

An inductor isolation apparatus and method to reduce interaction between inductors on an integrated circuit.