A multi-transmission power management circuit is provided. In embodiments disclosed herein, the multi-transmission power management circuit includes multiple quadrature power amplifier circuits each configured to concurrently generate multiple amplified radio frequency (RF) signals based on a respective modulated voltage(s). The multi-transmission power management circuit also includes an envelope tracking (ET) integrated circuit (ETIC) configured to concurrently generate multiple modulated voltages. A control circuit is configured to determine one or more of the multiple quadrature power amplifier circuits that are involved in a multi-transmission scheme. Accordingly, the control circuit can cause the ETIC to provide one or more of the multiple modulated voltages to each of the quadrature power amplifier circuits involved in the multi-transmission scheme. In this regard, the multi-transmission power management circuit can be flexibly configured to support different multi-transmission schemes.

A vector distribution method for operation of a power amplifier of a wireless transmitter including receiving, by a first amplifier circuit, a first input vector and a second input vector. The first input vector includes data derived from an input signal of the wireless transmitter and the second input vector includes other data derived from the input signal of the wireless transmitter. The method includes, in response to receiving the input signal, instructing the first amplifier circuit to output an output signal at a high voltage.

A transmit in-phase quadrature (IQ) amplifier includes a common gain stage to receive an input signal and to generate an amplified signal. The amplifier includes an IQ poly-phase filter coupled to the common gain stage to receive the amplified signal from the common gain stage and outputs a four-phase signal. The amplifier includes an in-phase (I) phase switching gain stage coupled to the IQ poly-phase filter to receive I components of the four-phase signal and outputs an amplified phase switching I signal. The amplifier includes a quadrature (Q) phase switching gain stage coupled to the IQ poly-phase filter to receive Q components of the four-phase signal and outputs an amplified phase switching Q signal.

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.

An electronic circuit and method are provided. The electronic circuit includes an in-phase (I)-quadrature (Q) amplifier including an I cascode branch and a Q cascode branch, the IQ amplifier configured to receive a differential input and control signals, control, based on the control signals, gate voltages in the I cascode branch and gate voltages in the Q cascode branch, generate an I output signal with the I cascode branch, and generate a Q output signal with the Q cascode branch, and a quadrature coupler configured to perform quadrature summation of the I output signal and the Q output signal and generate a final phase shifted output.

A low-power double-quadrature receiver is disclosed. The double-quadrature receiver includes a quadrature signal generator configured to generate a first quadrature signal and a second quadrature signal based on each component of a differential input signal, and a switching stage configured to perform down-conversion on the first quadrature signal and the second quadrature signal.

Circuits and methods for use in amplifying amplitude and phase modulated signals. A circuit uses a digital controlled multi stage combiner, a signal phase discrete mapper and a combiner digital control circuit with N parallel signal feeding it. The signals resulting from N power amplifiers have phases with belonging to an alphabet with M discrete phases prior to being fed to the multi stage combiner. The phases of the N input signals are converted in an control signal generator into Ns sets of digital control signals to control N.M sets of switches where the signals are selected according the phase and sent to the corresponding combiner in the M possible combiners. Each one combiner from the set of M combiner then combines these signals. A second stage with digital controlled combiner, combines into two sub-sets of signals the signals resulting from first stage and the resulting outputs of the combiner are then combined by a third combining digital controlled stage into the output signal. The signal amplifiers employed before the combining stage may be Class Dor Class F amplifiers to provide high efficiency amplification of the signals.

Techniques for generating a power tracking supply voltage for a circuit (e.g., a power amplifier) are disclosed. The circuit may process multiple transmit signals being sent simultaneously on multiple carriers at different frequencies. In one exemplary design, an apparatus includes a power tracker and a power supply generator. The power tracker determines a power tracking signal based on inphase (I) and quadrature (Q) components of a plurality of transmit signals being sent simultaneously. The power supply generator generates a power supply voltage based on the power tracking signal. The apparatus may further include a power amplifier (PA) that amplifies a modulated radio frequency (RF) signal based on the power supply voltage and provides an output RF signal.

A method of pre-compensating for transmitter in-phase (I) and quadrature (Q) mismatch (IQMM) may include sending a signal through an up-converter of a transmit path to provide an up-converted signal, determining the up-converted signal, determining one or more IQMM parameters for the transmit path based on the determined up-converted signal, and determining one or more pre-compensation parameters for the transmit path based on the one or more IQMM parameters for the transmit path. In some embodiments, the up-converted signal may be determined through a receive feedback path. In some embodiments, the up-converted signal may be determined through an envelope detector.

Multi-level envelope tracking systems with adjusted voltage steps are provided. In certain embodiments, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided. The envelope tracking system includes a multi-level supply (MLS) DC-to-DC converter that outputs multiple regulated voltages, an MLS modulator that controls selection of the regulated voltages over time based on an envelope signal corresponding to an envelope of a radio frequency (RF) signal amplified by the power amplifier, and a modulator output filter coupled between an output of the MLS modulator and the power amplifier supply voltage. The envelope tracking system further includes a switching point adaptation circuit configured to control the voltage level of the regulated voltages outputted by the MLS DC-to-DC converter based on a power level of the RF signal.