An antenna interface arrangement is disclosed for cancellation of a transmit signal at a receiver port of a transceiver. The antenna interface arrangement comprises an amplifier and a distributed transformer having a primary side winding, a first secondary side winding, and a second secondary side winding. The primary side winding is connectable to a transmitter port of the transceiver and has a first part (311) and a second part (312), the first secondary side winding (313) is connectable to an antenna port of the transceiver and has a first inductive coupling to the first part of the primary side winding, and the second secondary side winding (314, 315) is connectable to the receiver port of the transceiver and has a second inductive coupling to the second part of the primary side winding. The amplifier (305, 306) has an input connected to the first secondary side winding and an output connected to the second secondary side winding. The second inductive coupling is adapted to provide a first version of the transmit signal at the receiver port, and the first inductive coupling and the amplifier are adapted to provide a second version of the transmit signal at the receiver port, for cancelling the first version of the transmit signal. Corresponding transceiver and communication device are also disclosed.

An antenna interface arrangement is disclosed for cancellation of a transmit signal at a receiver port of a transceiver. The antenna interface arrangement comprises a distributed transformer and an impedance. The distributed transformer has a primary side winding connectable to an antenna port of the transceiver and having a first part (111) and a second part (112), a first secondary side winding (113) connectable to a transmitter port of the transceiver and having a first inductive coupling to the first part of the primary side winding, and a second secondary side winding (114) connectable to the receiver port of the transceiver and having a second inductive coupling to the second part of the primary side winding. The impedance (106, 107) is connected between the first secondary side winding and the second secondary side winding. The first and second inductive couplings are adapted to provide a first version of the transmit signal at the receiver port, and the impedance is adapted to provide a second version of the transmit signal at the receiver port, for cancelling the first version of the transmit signal. In some embodiments, the antenna interface arrangement is also for cancellation of a received signal at the transmitter port of the transceiver. Corresponding transceiver and communication device are also disclosed. In some embodiments, the antenna interface arrangement is also for cancellation of a received signal at the transmitter port of the transceiver. Corresponding transceiver and communication device are also disclosed.

A circuit portion for a radio transceiver comprises: a power amplifier for use when the transceiver operates in a transmission mode, a low-noise amplifier for use when the transceiver operates in a reception mode, a voltage control circuit portion, and a transformer. The transformer comprises a primary winding with a terminal for connecting to an antenna, and a secondary winding comprising a first terminal, a second terminal and a third terminal located between the first and second terminals. The power amplifier is connected to the secondary winding, the low-noise amplifier is connected to both the primary and secondary windings and the voltage control circuit portion is connected to the third terminal of the secondary winding. The voltage control circuit portion applies a first voltage to the third terminal when the transceiver operates in the transmission mode and applies a second, different voltage when the transceiver operates in the reception mode.

An antenna interface arrangement is disclosed for cancellation of a transmit signal at a receiver port of a transceiver. The antenna interface arrangement comprises an amplifier and a distributed transformer having a primary side winding, a first secondary side winding, and a second secondary side winding. The primary side winding is connectable to a transmitter port of the transceiver and has a first part (311) and a second part (312), the first secondary side winding (313) is connectable to an antenna port of the transceiver and has a first inductive coupling to the first part of the primary side winding, and the second secondary side winding (314, 315) is connectable to the receiver port of the transceiver and has a second inductive coupling to the second part of the primary side winding. The amplifier (305, 306) has an input connected to the first secondary side winding and an output connected to the second secondary side winding. The second inductive coupling is adapted to provide a first version of the transmit signal at the receiver port, and the first inductive coupling and the amplifier are adapted to provide a second version of the transmit signal at the receiver port, for cancelling the first version of the transmit signal. Corresponding transceiver and communication device are also disclosed.

According to certain aspects, a chip includes a pad, a power amplifier, a transformer coupled between an output of the power amplifier and the pad, a transistor coupled between the transformer and a ground, and a first clamp circuit coupled between a gate of the transistor and a drain of the transistor.

According to certain aspects, a chip includes a pad, a power amplifier, a transformer coupled between an output of the power amplifier and the pad, a transistor coupled between the transformer and a ground, and a first clamp circuit coupled between a gate of the transistor and a drain of the transistor.

A radio frequency module includes: a module board that includes a first principal surface and a second principal surface on opposite sides of the module board; a power amplifier; and a first circuit component. The power amplifier includes: a first amplifying element; a second amplifying element; and an output transformer that includes a primary coil and a secondary coil. An end of the primary coil is connected to an output terminal of the first amplifying element, another end of the primary coil is connected to an output terminal of the second amplifying element, an end of the secondary coil is connected to an output terminal of the power amplifier, the first amplifying element and the second amplifying element are disposed on the first principal surface, and the first circuit component is disposed on the second principal surface.

In certain aspects, a chip includes a pad, and a power amplifier having a first output and a second output. The chip also includes a transformer, wherein the transformer includes a first inductor coupled between a first terminal and a second terminal of the transformer, wherein the first terminal is coupled to the first output of the power amplifier, and the second terminal is coupled to the second output of the power amplifier. The transformer also includes a second inductor coupled between a third terminal and a fourth terminal of the transformer, wherein the third terminal is coupled to the pad. The chip also includes a first switch coupled to the fourth terminal, a shunt inductor coupled in parallel with the first switch, and a low-noise amplifier coupled to the third terminal.

A radio frequency circuit includes an adjustable transformer, a first-stage amplifier, and a second-stage amplifier, the first-stage amplifier is coupled to the second-stage amplifier by using the adjustable transformer, and a bandwidth of the adjustable transformer is adjustable. When the bandwidth of the adjustable transformer is adjusted, an operating frequency band of the radio frequency circuit covers an n258 frequency band and an n257 frequency band, or the n258 frequency band and an n261 frequency band.

A transformer has a first inductor that includes a first port. The transformer also has a second inductor magnetically coupled to the first inductor. The second inductor includes a second port. The second inductor includes a first portion configured to permit current flow in a clockwise direction and a second portion configured to permit current flow in a counter-clockwise direction. The transformer also has a third inductor magnetically coupled to the first inductor. The third inductor includes a third port. The counter-clockwise direction is opposite the clockwise direction to reduce magnetic coupling between the second inductor and the third inductor based on magnetic coupling cancellation.