Certain aspects of the present disclosure are directed to a circuit for signal processing. The circuit generally includes a first transformer having a first inductive element magnetically coupled with a second inductive element, and a second transformer having a third inductive element magnetically coupled with a fourth inductive element, wherein the first inductive element is coupled in series with the third inductive element. In certain aspects, the circuit also includes a first switch coupled in parallel with the third inductive element, a capacitive element coupled in parallel with the fourth inductive element, wherein a notch is formed at least by the capacitive element and the fourth inductive element, the notch circuit coupled in series with the second inductive element, and a second switch coupled in parallel with the fourth inductive element.

A temperature compensation circuit for a radio frequency power amplifier includes: a temperature control circuit and a negative feedback circuit; the temperature control circuit is configured to generate a first electrical signal corresponding to a temperature, and according to the first electrical signal, adjust a second electrical signal at a first node; the negative feedback circuit is configured to provide, on the basis of the second electrical signal, a negative feedback signal to the radio frequency power amplifier by means of a second node; the second electrical signal is used to change the resistance value of the negative feedback circuit so as to adjust a negative feedback signal that is associated with the resistance value; the negative feedback signal is used to be inputted into the radio frequency power amplifier such that the gain of the radio frequency power amplifier changes.

A wireless transmitter includes a an amplifier; and a switchable transformer, coupled to the amplifier, wherein the amplifier is configured to be coupled to the switchable transformer in first and second configurations, wherein the first configuration causes the amplifier to provide a first output impedance to the switchable transformer, and wherein the second configuration causes the amplifier to provide a second output impedance to the switchable transformer, the first and second output impedances being different from each other.

A gallium nitride based monolithic microwave integrated circuit includes a substrate, a channel layer on the substrate and a barrier layer on the channel layer. A recess is provided in a top surface of the barrier layer. First gate, source and drain electrodes are provided on the barrier layer opposite the channel layer, with a bottom surface of the first gate electrode in direct contact with the barrier layer. Second gate, source and drain electrodes are also provided on the barrier layer opposite the channel layer. A gate insulating layer is provided in the recess in the barrier layer, and the second gate electrode is on the gate insulating layer opposite the barrier layer and extending into the recess. The first gate, source and drain electrodes comprise the electrodes of a depletion mode transistor, and the second gate, source and drain electrodes comprise the electrodes of an enhancement mode transistor.

An electronic device comprises a first communication circuit configured to transmit at least one radio frequency (RF) signal, at least one antenna structure, electrically coupled to the first communication circuit, and including a plurality of antenna elements, at least one processor operatively coupled to the first communication circuit, and memory operatively coupled to the at least one processor. The memory stores instructions that, when executed by the at least one processor, causes the processor to perform a plurality of operation. The plurality of operations comprises identifying mobility information of the electronic device, identifying a beam width of a beam formed by at least a part of the plurality of antenna elements based on at least part of the mobility information of the electronic device, the beam being used to search for or communicate with an external electronic device, and forming the beam having the identified beam width.

An electronic device comprises a first communication circuit configured to transmit at least one radio frequency (RF) signal, at least one antenna structure, electrically coupled to the first communication circuit, and including a plurality of antenna elements, at least one processor operatively coupled to the first communication circuit, and memory operatively coupled to the at least one processor. The memory stores instructions that, when executed by the at least one processor, causes the processor to perform a plurality of operation. The plurality of operations comprises identifying mobility information of the electronic device, identifying a beam width of a beam formed by at least a part of the plurality of antenna elements based on at least part of the mobility information of the electronic device, the beam being used to search for or communicate with an external electronic device, and forming the beam having the identified beam width.

An inductor circuit includes first inductive circuit, second inductive circuit, and third inductive circuit. First inductive circuit at receiver side has a first end coupled to a first port of an antenna and a second end coupled to an input port of a receiving circuit. Second inductive circuit at transmitter side has a first end and a second end respectively coupled to output ports of a power amplifier. Third inductive circuit at antenna side has a first end coupled to a first port of the antenna and having a second end. Second inductive circuit and the third inductive circuit are disposed on an outer ring to form a ring shape and the third inductive circuit is disposed on an inner ring within the outer ring to form a spiral shape. Third inductive circuit is disposed between the second inductive circuit and the first inductive circuit.

An inductor circuit includes first inductive circuit, second inductive circuit, and third inductive circuit. First inductive circuit at receiver side has a first end coupled to a first port of an antenna and a second end coupled to an input port of a receiving circuit. Second inductive circuit at transmitter side has a first end and a second end respectively coupled to output ports of a power amplifier. Third inductive circuit at antenna side has a first end coupled to a first port of the antenna and having a second end. Second inductive circuit and the third inductive circuit are disposed on an outer ring to form a ring shape and the third inductive circuit is disposed on an inner ring within the outer ring to form a spiral shape. Third inductive circuit is disposed between the second inductive circuit and the first inductive circuit.

A linearization circuit reduces intermodulation distortion in an amplifier that includes a first stage and a second stage. The linearization circuit receives a first signal that includes a first frequency and a second frequency and generates a difference signal having a frequency approximately equal to the difference of the first frequency and the second frequency, generates an envelope signal based at least in part on a power level of the first signal, and adjusts a magnitude of the difference signal based on the envelope signal. When the amplifier receives the first signal at an input terminal, the first stage receives the adjusted signal, and the second stage does not receive the adjusted signal, intermodulation between the adjusted signal and the first signal cancels at least a portion of the intermodulation between the first frequency and the second frequency from the output of the amplifier.

A linearization circuit reduces intermodulation distortion in an amplifier that includes a first stage and a second stage. The linearization circuit receives a first signal that includes a first frequency and a second frequency and generates a difference signal having a frequency approximately equal to the difference of the first frequency and the second frequency, generates an envelope signal based at least in part on a power level of the first signal, and adjusts a magnitude of the difference signal based on the envelope signal. When the amplifier receives the first signal at an input terminal, the first stage receives the adjusted signal, and the second stage does not receive the adjusted signal, intermodulation between the adjusted signal and the first signal cancels at least a portion of the intermodulation between the first frequency and the second frequency from the output of the amplifier.