A power supply switch circuit includes a switch circuit including a first switch configured to switch a first power source voltage to a power supply terminal of a power amplifier, and a second switch configured to switch a second power source voltage to the power supply terminal; a switch controller configured to control the switch circuit; and a power supply circuit configured to supply a third power source voltage to the power supply terminal when a first voltage of the power supply terminal is lower than a predetermined second voltage.

Various embodiments of the disclosure relate to a device and a method for supplying power to a plurality of power amplifiers in an electronic device. An electronic device may include: a first power amplifier, a second power amplifier, a third power amplifier, a first power supply module including a power supply configured to supply power to the first power amplifier or the second power amplifier, a second power supply module including a power supply configured to supply power to the second power amplifier or the third power amplifier, and a detection module comprising circuitry configured to identify a state of a connection between the second power amplifier and the first power supply module and a state of a connection between the second power amplifier and the second power supply module, wherein the detection module may be configured to output a power control signal based on detecting that the second power amplifier is connected to the first power supply module and the second power supply module, wherein power supply to the second power amplifier from the first power supply module or the second power supply module may be shut off based on the power control signal of the detection module.

A symbol-power-tracking (SPT) voltage supply to power a radio-frequency power amplifier (RF PA) is shown. A power converter is coupled to an output port of an input power source for power conversion, and has an output terminal coupled to a power terminal of the RF PA. A transition capacitor is coupled to the power terminal of the radio-frequency power amplifier through the output terminal of the power converter. An assisted charging and discharging circuit is coupled to the transition capacitor during cyclic prefix (CP) sections. A multi-level array is provided which includes a plurality of voltage-regulated capacitors pre-charged to and kept at different voltage levels. During each symbol section, a target capacitor at a fixed voltage level matching the current SPT situation is selected from among the voltage-regulated capacitors to be coupled to the power terminal of the radio-frequency power amplifier.

A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.

An envelope tracking power supply, which includes a parallel amplifier, switching circuitry, and a parallel switching supply, is disclosed. The envelope tracking power supply provides an envelope power supply signal to a load. The parallel amplifier regulates an envelope power supply voltage of the envelope power supply signal based on a setpoint of the envelope power supply voltage. The switching circuitry at least partially provides the envelope power supply signal via a first inductive element and drives an output current from the parallel amplifier toward zero. The parallel switching supply provides an assist current to further drive the output current from the parallel amplifier toward zero based on an estimate of a current in the first inductive element and an estimate of a current in the load.

A power amplifying circuit includes a switching circuit, an amplifier and a load. The switching circuit receives a first supply voltage and a second supply voltage. When the switching circuit is in a first operation mode, the first supply voltage is provided to a node. When the switching circuit is in a second operation mode, the second supply voltage is provided to the node. The amplifier receives a first input signal and a second input signal, and outputs a first output signal and a second output signal from a first output terminal and a second output signal, respectively. The load includes a first inductor and a second inductor. The first inductor is connected between the node and the first output terminal. The second inductor is connected between the node and the second output terminal.

A communication circuit, including a first supply modulator configured to provide a first supply voltage; a first power amplifier configured to generate a first output signal by amplifying a first input signal corresponding to a first operation frequency band; a second power amplifier configured to generate a second output signal by amplifying a second input signal corresponding to a second operation frequency band; and a switching circuit configured to selectively provide the first supply voltage from the first supply modulator to the second power amplifier based on a first switching signal according to an operation mode.

A bias timing control circuit includes a current source, a bias switch circuit, a duty cycle sensing circuit, and a switching control circuit. The bias switch circuit includes a first path switch, connected between an output node of the current source and a bias amplifying circuit, and a second path switch, connected between the output node of the current source and a temperature compensation circuit. The duty cycle sensing circuit is configured to generate a timing control signal based on a duty cycle of a transmission enable signal. The switching control circuit is configured to control a first turn-on time of the first path switch during an initial startup period, and a second turn-on time of the second path switch during a normal driving period subsequent to the initial startup period to adjust a warm-up time of a power amplifying circuit based on the timing control signal.

A tracker circuit configured to provide a variable supply voltage to a power amplifier (PA) circuit is disclosed. The tracker circuit includes a state machine circuit comprising a plurality of states mapped in accordance with transitions associated with a mapping scheme. In some embodiments, the plurality of states of the state machine circuit identify one or more operational modes associated with the tracker circuit, wherein at least one operational mode comprises one or more voltage levels respectively associated therewith. In some embodiments, the one or more operational modes includes at least two active operational modes. In some embodiments, a transition between the one or more operational modes of the tracker circuit is controlled by a digital selection signal received from a digital communication interface associated therewith.

An amplifier for driving a display panel includes an input stage, a gain stage and an output stage. The gain stage is coupled to the input stage. The output stage, coupled to the gain stage, includes a first output driving circuit and a second output driving circuit. The first output driving circuit is operated in a first voltage domain. The second output driving circuit is operated in a second voltage domain different from the first voltage domain.