An amplifying circuit may include: an amplifier configured to receive a first input voltage and output a first output voltage by amplifying the first input voltage; and a common-mode feedback circuit configured to enable the first output voltage to operate in a common mode by receiving the first output voltage and performing a feedback to adjust at least one feedback voltage applied to the amplifier based on the first output voltage. The common-mode feedback circuit may include a first Miller compensation circuit configured to perform dominant pole compensation by using a Miller effect for the common-mode feedback circuit. The first Miller compensation circuit may include a resistor and a capacitor.

An amplifying circuit may include: an amplifier configured to receive a first input voltage and output a first output voltage by amplifying the first input voltage; and a common-mode feedback circuit configured to enable the first output voltage to operate in a common mode by receiving the first output voltage and performing a feedback to adjust at least one feedback voltage applied to the amplifier based on the first output voltage. The common-mode feedback circuit may include a first Miller compensation circuit configured to perform dominant pole compensation by using a Miller effect for the common-mode feedback circuit. The first Miller compensation circuit may include a resistor and a capacitor.

The invention relates to a radio frequency oscillator, the radio frequency oscillator comprising a resonator circuit being resonant at an excitation of the resonator circuit in a differential mode and at an excitation of the resonator circuit in a common mode, wherein the resonator circuit has a differential mode resonance frequency at the excitation in the differential mode, and wherein the resonator circuit has a common mode resonance frequency at the excitation in the common mode, a first excitation circuit being configured to excite the resonator circuit in the differential mode to obtain a differential mode oscillator signal oscillating at the differential mode resonance frequency, and a second excitation circuit being configured to excite the resonator circuit in the common mode to obtain a common mode oscillator signal oscillating at the common mode resonance frequency.

The invention relates to a radio frequency oscillator, the radio frequency oscillator comprising a resonator circuit being resonant at an excitation of the resonator circuit in a differential mode and at an excitation of the resonator circuit in a common mode, wherein the resonator circuit has a differential mode resonance frequency at the excitation in the differential mode, and wherein the resonator circuit has a common mode resonance frequency at the excitation in the common mode, a first excitation circuit being configured to excite the resonator circuit in the differential mode to obtain a differential mode oscillator signal oscillating at the differential mode resonance frequency, and a second excitation circuit being configured to excite the resonator circuit in the common mode to obtain a common mode oscillator signal oscillating at the common mode resonance frequency.

Devices and methods for generating a bias voltage for a transceiver operating in time division multiplexing operation, and corresponding transceivers are provided. In this case, the bias voltage is controlled in guard intervals between transmission and reception of signals by the transceiver.

Devices and methods for generating a bias voltage for a transceiver operating in time division multiplexing operation, and corresponding transceivers are provided. In this case, the bias voltage is controlled in guard intervals between transmission and reception of signals by the transceiver.

A power amplifier includes a semiconductor die having a main amplifier and a peaking amplifier. The main amplifier includes at least one first transistor, and the peaking amplifier includes at least one second transistor that is different than the first transistor. The peaking amplifier is configured to modulate a load impedance of the main amplifier responsive to a common gate bias applied to respective gates of the first and second transistors. Related fabrication and methods of operation are also discussed.

A power amplifier includes a semiconductor die having a main amplifier and a peaking amplifier. The main amplifier includes at least one first transistor, and the peaking amplifier includes at least one second transistor that is different than the first transistor. The peaking amplifier is configured to modulate a load impedance of the main amplifier responsive to a common gate bias applied to respective gates of the first and second transistors. Related fabrication and methods of operation are also discussed.

A power amplifier circuit includes a first transistor, a second transistor and a bias circuit. The first transistor has a base configured to receive a first signal. The second transistor has an emitter connecting to a collector of the first transistor and a collector configured to output a second signal. The bias circuit is coupled to the first transistor and the second transistor. The bias circuit is configured to provide a direct current (DC) voltage at the collector of the second transistor about twice a DC voltage at the collector of the first transistor. The bias circuit is configured to provide an alternating current (AC) or radio frequency (RF) voltage at the collector of the second transistor about twice an AC or RF voltage at the collector of the first transistor.

Radio frequency (RF) amplifier circuitry includes an input node, an output node, an amplifier, and bootstrap circuitry. The amplifier includes a control node coupled to the input node, a first amplifier node coupled to the output node, and a second amplifier node coupled to a fixed potential. The amplifier is configured to receive an input signal having a first frequency at the control node and change an impedance between the first amplifier node and the second amplifier node based on the input signal. The bootstrap circuitry is coupled between the control node and the second amplifier node. The bootstrap circuitry is configured to provide a low impedance path between the control node and the second amplifier node for signals having a second frequency that is equal to about twice the first frequency and provide a high impedance path for signals having a frequency outside the second frequency.