Disclosed is an electronic device including: a communication circuit; and a processor operationally connected to the communication circuit, where the processor is configured to use the communication circuit to merge a first transmission signal of a first communication scheme corresponding to a first band that is one of transmission bands of the first communication scheme and a second transmission signal of a second communication scheme corresponding to a second band that is one of the transmission bands, amplify the merged first transmission signal and second transmission signal using a power amplifier, transmit the amplified first transmission signal to a first external electronic device communicating in the first communication scheme, and transmit the amplified second transmission signal to a second external electronic device communicating in the second communication scheme. Other various embodiments are possible.

An apparatus for detecting difference in operating characteristics of a main circuit by using a replica circuit is presented. In one exemplary case, a sensed difference in operating characteristics of the two circuits is used to drive a tuning control loop to minimize the sensed difference. In another exemplary case, several replica circuits of the main circuit are used, where each is isolated from one or more operating variables that affect the operating characteristic of the main circuit. Each replica circuit can be used for sensing a different operating characteristic, or, two replica circuits can be combined to sense a same operating characteristic.

Apparatus and methods for envelope tracking systems with automatic mode selection are provided herein. In certain configurations, a power amplifier system includes a power amplifier configured to provide amplification to a radio frequency signal and to receive power from a power amplifier supply voltage, and an envelope tracker including a signal bandwidth detection circuit configured to generate a detected bandwidth signal based on processing an envelope signal corresponding to an envelope of the radio frequency signal. The envelope tracker further includes a switch bank configured to receive a plurality of regulated voltages, a filter configured to filter an output of the switch bank to generate the power amplifier supply voltage, and a mode control circuit configured to control a filtering characteristic of the filter based on the detected bandwidth signal.

Disclosed herein are power amplification systems that are dynamically biased based on a signal indicative of an envelope of the signal being amplified. The power amplification systems include a power amplifier configured to amplify an input radio-frequency (RF) signal to generate an output RF signal when biased by a biasing signal. The power amplification systems also include a bias component configured to generate the biasing signal based on an envelope signal indicative of an envelope of the input RF signal. The biasing signal can improve or enhance the linearity of the power amplification systems.

Multi-band power amplification system having enhanced efficiency through elimination of band selection switch. In some embodiments, a power amplification system can include a plurality of power amplifiers (PAs), with each PA being configured to receive and amplify a radio-frequency (RF) signal in a frequency band. The power amplification system can further include an output filter coupled to each of the PAs by a separate output path such that the power amplification system is substantially free of a band selection switch between the plurality of PAs and their corresponding output filters. Each PA can be further configured to drive approximately a characteristic load impedance of the corresponding output filter by, for example, the PA being operated with a high-voltage (HV) supply.

A method for predistorting an input signal of an amplifier device comprises evaluating a selection criterion for a computational model of the amplifier device. The computational model provides an output signal of the amplifier device for the input signal of the amplifier device. Further, the method comprises selecting between a first computational model of the amplifier device and a second computational model of the amplifier device based on the evaluated selection criterion. Additionally, the method comprises predistorting the input signal of the amplifier device using the selected computational model.

An envelope-tracking power supply modulator (ETSM) supplies power to a radio frequency power amplifier (RFPA) of a radio frequency (RF) circuit according to a baseband envelope signal. The ETSM includes a linear amplifier, a capacitor, a single inductor multiple output (SIMO) switch-mode converter, and a controller. The linear amplifier receives the baseband envelope signal, and has its output terminal coupled to a power input of the RFPA. One terminal of the capacitor is coupled to a reference voltage, and the other terminal is coupled to a power input of the linear amplifier. The SIMO switch-mode converter includes two output terminals. One of the output terminals is coupled to the capacitor and the power input of the linear amplifier, and the other of the output terminals is coupled to the output terminal of the linear amplifier and the power input of the RFPA. The controller controls the SUMO switch-mode converter.

Embodiments of the disclosure relate to a multi-mode power management system supporting fifth-generation new radio (5G-NR). The multi-mode power management system includes first tracker circuitry and second tracker circuitry each capable of supplying an envelope tracking (ET) modulated or an average power tracking (APT) modulated voltage. In examples discussed herein, the first tracker circuitry and the second tracker circuitry have been configured to support third-generation (3G) and fourth-generation (4G) power amplifier circuits in various 3G/4G operation modes. The multi-mode power management system is adapted to further support a 5G-NR power amplifier circuit(s) in various 5G-NR operation modes based on the existing first tracker circuitry and/or the existing second tracker circuitry. In this regard, the 5G-NR power amplifier circuit(s) can be incorporated into the existing multi-mode power management system with minimum hardware changes, thus enabling 5G-NR support without significantly increasing component count, cost, and footprint of the multi-mode power management system.

A microphone circuit including a JFET or MOSFET transistor, one input of an impedance network connected to the transistor's gate, a terminal of a source resistor connected to the transistor's source, another terminal of the source resistor connected to ground, a bypass capacitor connected in parallel to the source resistor, one terminal of a load resistor connected to the transistor's drain, VCC_LOW connected to another terminal of the load resistor, an input of an op-amplifier connected to the transistor's source through a bi-directional low-pass-filter, another input of the op-amplifier connected to reference voltage, an output of the op-amplifier connected to another terminal of the input impedance network through an LPF, an energy detector connected to the transistor's drain via a coupling capacitor, an LPF connected to the energy detector output, and an LPF connected to the output of the energy detector, the input impedance network connected to a microphone.

A PA power supply, which includes a first ET power supply, power supply control circuitry, a first PMOS switching element, and a second PMOS switching element, is disclosed. During a first operating mode, the power supply control circuitry selects an OFF state of the first PMOS switching element, selects an ON state of the second PMOS switching element, and adjusts a voltage of a first switch control signal to maintain the OFF state of the first PMOS switching element using a voltage at a source of the first PMOS switching element and a voltage at a drain of the first PMOS switching element; the PA power supply provides a first PA power supply signal; and the first ET power supply provides a first ET power supply signal, such that the first PA power supply signal is based on the first ET power supply signal.