Doherty power amplifiers and devices are described with a low voltage driver stage in a carrier-path and a high voltage driver stage in a peaking-path. In an embodiment a Doherty power amplifier has a carrier-path driver stage transistor configured to operate using a first bias voltage at the driver stage output, and a final stage transistor configured to operate using a second bias voltage at the final stage output. A peaking-path driver stage transistor is configured to operate using a third bias voltage at the driver stage output, and a final stage transistor electrically coupled to the driver stage output of the peaking-path driver stage transistor is configured to operate using a fourth bias voltage at the final stage output, wherein the third bias voltage is at least twice as large as the first bias voltage.

A power amplifier circuit includes a differential amplifier circuit configured to amplify a radio-frequency signal, a transformer disposed on an output side with respect to the differential amplifier circuit and including a primary winding and a secondary winding, and a dispersion circuit coupled to a midpoint of the primary winding of the transformer and configured to operate as an adjustment circuit. The dispersion circuit is configured to adjust, based on a supply voltage controlled in accordance with the envelope of the radio-frequency signal, a bias (bias current or bias voltage) to be supplied to the differential amplifier circuit.

A power amplifier includes a power splitter that splits a first signal into a second signal and a third signal, a first amplifier that amplifies the second signal within an area where the first signal has a power level greater than or equal to a first level and that outputs a fourth signal, a second amplifier that amplifies the third signal within an area where the first signal has a power level greater than or equal to a second level higher than the first level and that outputs a fifth signal, an output unit that outputs an amplified signal of the first signal, a first and a second LC parallel resonant circuit, and a choke inductor having an end to which a power supply voltage is supplied and another end connected to a node of the first and second LC parallel resonant circuits.

One example includes a device that is comprised of a pre-power amplifier, a power amplifier, a signal path, and a dynamic bias circuit. The pre-power amplifier amplifies an input signal and outputs a first amplified signal. The power amplifier receives the first amplified signal and amplifies the first amplified signal based on a dynamic bias signal to produce a second amplified signal at an output thereof. The signal path is coupled between an output of the pre-power amplifier and an input of the power amplifier. The dynamic bias circuit monitors the first amplified signal, generates the dynamic bias signal, and outputs the dynamic bias into the signal path.

A power amplifier circuit includes a first amplification element having an output terminal and amplifying a harmonic signal input to an input terminal, a second amplification element having an output terminal and amplifying a harmonic signal input to an input terminal, a bias circuit that supplies a bias to each of the input terminal of the first amplification element and the second amplification element, a first resistance element electrically connected to the output terminal of the first amplification element, and a second resistance element electrically connected to the output terminal of the second amplification element and electrically connected to the other end of the first resistance element in series, the bias circuit is electrically connected to a connection point in a portion in which the other end of the first resistance element and the other end of the second resistance element are electrically connected in series.

A mixer includes a load portion connected between an input terminal of a first power voltage and an output terminal of the radio frequency transmit signal and configured to adjust a magnitude of the radio frequency transmit signal, a first switching unit connected to an output terminal of the radio frequency transmit signal, and configured to perform a first switching operation in response to a plurality of local oscillation signals, and a second switching unit connected between the first switching unit and an input terminal of a second power voltage, lower than the first power voltage, and configured to perform a second switching operation in response to a plurality of baseband signals, the plurality of local oscillation signals include an I+ baseband signal, an I− baseband signal, a Q+ baseband signal, and a Q− baseband signal, and the second switching unit includes a first branch performing a switching operation under control of the I+ baseband signal and the Q+ baseband signal, a second branch performing a switching operation under control of the I− baseband signal and the Q− baseband signal, a third branch performing a switching operation under control of the Q+ baseband signal and the I− baseband signal, and a fourth branch performing a switching operation under control of the Q− baseband signal and the I+ baseband signal.

Provided is a dual-drive based Doherty amplifier that includes a first power amplifier and a second power amplifier that is in parallel with the first power amplifier. The first power amplifier is configured to receive a first portion of a signal having a first phase, and the second power amplifier is configured to receive a second portion of the signal having a second phase that has a phase difference from the first phase. At least one of the first power amplifier or the second power amplifier includes a dual-drive power amplifier core.

A measurement system includes a source unit to provide a source signal to a sample and a voltage source and/or a current source and a memory. The system also includes a measurement unit configured to acquire from the sample an measurement signal that may be responsive to the source signal and a voltage measuring unit, a current measuring unit, and/or a capacitance measuring unit, and a memory. The system also includes a control unit including a digital signal processing unit; a source converter; a measurement converter. The system further includes a synchronization unit configured to synchronize clocks of the digital signal processing unit, the source converter, the measurement converter, the source unit, and the measurement unit; a calibration unit for calibrating aspects of the system including the control unit; and a reference voltage supply configured to supply a common reference voltage for the control unit.

Segmented power amplifier (PA) arrangements are disclosed. An example PA arrangement includes at least first and second PA segments, each having a respective combination of a PA and a feedforward adaptive bias circuit, configured to generate a bias signal for the corresponding PA. Each bias signal has a first DC component, at least one tone component, and at least one harmonic of the at least one tone component. The PA arrangement further includes a power splitting circuit, configured to split an input signal for the PA arrangement into a first PA input signal for the first PA segment and a second PA input signal for the second PA segment, where a power of the first PA input signal is greater than a power of the second PA input signal.

The present invention discloses a matching circuit with switchable load lines, a load line switching method and a power amplifier. The matching circuit matches the output impedance of the power amplifier, which amplifies an input signal and outputs an amplified signal. The matching circuit comprises a filter circuit and a switch group for load line selection, the output end of the filter circuit is connected to the switch group. The switch group comprises at least two independent switches, each switch independently constitutes a signal line, and each switch is configured with an external control signal to control on/off. The matching circuit provided by the invention adopts a switch group composed of at least two independent switches, and each independent switch forms a signal line to connect loads, so that multiple loads can be connected at the same time.