An amplifier circuitry includes a first amplifier, a second amplifier, a voltage generating circuitry, and a control circuitry. The first amplifier circuitry configured to amplify a first signal. The second amplifier circuitry configured to amplify a second signal which forms differential signals together with the first signal. The voltage generating circuitry configured to generate at least one of a first bias voltage to be applied to the first signal and a second bias voltage to be applied to the second signal. The control circuitry configured to control the voltage generation circuitry so as to decrease a difference between a DC component of an output of the first amplifier circuitry and a DC component of an output of the second amplifier circuitry.

An amplifier circuitry includes a first amplifier, a second amplifier, a voltage generating circuitry, and a control circuitry. The first amplifier circuitry configured to amplify a first signal. The second amplifier circuitry configured to amplify a second signal which forms differential signals together with the first signal. The voltage generating circuitry configured to generate at least one of a first bias voltage to be applied to the first signal and a second bias voltage to be applied to the second signal. The control circuitry configured to control the voltage generation circuitry so as to decrease a difference between a DC component of an output of the first amplifier circuitry and a DC component of an output of the second amplifier circuitry.

According to at least one aspect of the disclosure, a front-end module is provided comprising an input configured to receive a radio-frequency signal, an output configured to be coupled to an antenna, a balun coupled to the output, one or more power amplifiers coupled to the input, and an inverter coupled between the one or more power amplifiers and the balun, the inverter being configured to provide output impedance matching to the one or more power amplifiers.

A power amplification system is provided comprising: a power amplifier circuit, the power amplifier circuit including a plurality of transistors; and a frequency response compensation circuit for providing a plurality of values of capacitance. The frequency response compensation circuit having at least one tuning capacitor. Each of the at least one tuning capacitors is coupled to a tuning switch for regulating the current path to and/or from the corresponding capacitor to control the value of the capacitance provided by the frequency response compensation circuit. The frequency response compensation circuit is coupled to at least two of the transistors of the power amplifier circuit. The frequency response compensation circuit is configured to reduce variation over frequency of a load impedance of the power amplification system. A wireless device comprising such a power amplification system is also provided. A wireless module comprising such a power amplification system is also provided.

A power amplification system is provided comprising: a power amplifier circuit; an output power control circuit for providing a plurality of values of capacitance, and a balun coupled to the power amplifier circuit and to the output power control circuit. The output power control circuit includes at least one load control capacitor. Each of the at least one load control capacitors is coupled to a load control switch for regulating the current path to and/or from the corresponding capacitor to control the value of the capacitance provided by the output power control circuit. A wireless device comprising such a power amplification system is also provided. A wireless module comprising such a power amplification system is also provided.

A system includes a first differential amplifier and a first transformer with a primary coil coupled to an output of the first differential amplifier and with a secondary coil coupled to a load. The system also includes a second differential amplifier and a second transformer with a primary coil coupled to an output of the second differential amplifier and with a secondary coil coupled in series with the secondary coil of the first transformer. The system also includes a tuning network coupled to a center tap node between the secondary coil of the first transformer and the secondary coil of the second transformer.

A radio frequency circuit assembly architecture is disclosed. An example radio frequency circuit assembly architecture comprises a signal contact and an antenna contact, a power amplifier module connected in a signal path between the signal contact and the antenna contact, the signal path between the power amplifier module and the antenna contact including a differentially signaled portion having a first path and a second path, and a pair of band pass filters, a first band pass filter of the pair of band pass filters being connected in the first path of the differentially signaled portion and a second band pass filter of the pair of band pass filters being connected in the second path of the differentially signaled portion.

Example embodiments relate to push-pull class E amplifiers. One example push-pull class E amplifier includes an input configured for receiving a signal to be amplified. The push-pull class E amplifier also includes an output configured for outputting the signal after amplification. Additionally, the push-pull class E amplifier includes a printed circuit board having a first dielectric layer and a second dielectric layer. Further, the push-pull class E amplifier includes a first amplifying unit and a second amplifying unit. Yet further, the push-pull class E amplifier includes a balun, a capacitive unit, a first line segment, a second line segment, a third line segment, and a fourth line segment. The first line segment and the second line segment are arranged on the first dielectric layer. A combined length of the third line segment and the fourth line segment corresponds to a quarter wavelength of an operational frequency of the amplifier.

Apparatus and methods for reconfigurable power amplifiers are disclosed. In certain embodiments, a mobile device includes a transceiver configured to generate a first radio frequency signal of a first frequency band and a second radio frequency signal of a second frequency band, and a front-end system including a push-pull power amplifier configured to selectively amplify one of the first radio frequency signal or the second radio frequency signal based on a band control signal. The push-pull power amplifier includes an input balun, an output balun, and a pair of amplifiers coupled between the input balun and the output balun. The band control signal is operable to control an input capacitance of the pair of amplifiers.

Wideband baluns with enhanced amplitude and phase balance are provided. The wideband balun includes a first transmission line connected between a first port and a third port, and a second transmission line connected between a second port and a fourth port, and a third transmission line connected between the third port and a reference voltage, such as ground. To enhance phase and/or amplitude balance of the wideband balun, the wideband balun further includes a compensation structure operable to provide at least one of capacitive compensation or inductive compensation to balance the wideband balun. For example, in certain implementations, the compensation structure includes at least one of (i) a capacitor connected between the first port and the second port or (ii) a fourth transmission line connected between the first transmission line and the third port.