An apparatus includes a phased array antenna panel and a plurality of beam former circuits. The phased array antenna panel generally comprises a plurality of antenna elements. The plurality of beam former circuits are each mounted on the phased array antenna panel adjacent to a number of the antenna elements. Each beam former circuit has one or more ports directly coupled to each of the adjacent antenna elements. Each beam former circuit may be configured to generate a plurality of radio-frequency output signals at the ports while in a transmit mode and receive a plurality of radio-frequency input signals at the ports while in a receive mode. Each beam former circuit generally implements a hard-wired address.

An apparatus includes a phased array antenna panel and one or more beam former circuits mounted on the phased array antenna panel. The phased array antenna panel generally comprises a plurality of antenna elements. The plurality of antenna elements are generally arranged in one or more groups. Each beam former circuit may be coupled to a respective group of the antenna elements. Each beam former circuit generally comprises a plurality of transceiver channels. Each transceiver channel generally comprises a power amplifier circuit configured, when operating in a transmit mode, to drive a respective one of the antenna elements. The power amplifier circuit generally comprises separate bias and voltage supply inputs providing additional power control.

An apparatus includes a phased array antenna panel and one or more beam former circuits mounted on the phased antenna array panel. The phased array antenna panel generally comprises a plurality of antenna elements arranged in one or more groups. Each of the one or more beam former circuits may be coupled to a respective group of the antenna elements. Each of the one or more beam former circuits may comprise a plurality of transceiver channels. Each transceiver channel generally comprises a power amplifier circuit configured, when operating in a transmit mode, to drive a respective one of the antenna elements. The power amplifier generally comprises a feedback network coupled between an output and an input of the power amplifier circuit.

An apparatus includes a phased array antenna panel and one or more beam former circuits. The phased array antenna panel generally comprises a plurality of antenna elements. The plurality of antenna elements are generally arranged in one or more groups. The one or more beam former circuits may be mounted on the phased array antenna panel. Each beam former circuit is generally coupled to a respective group of the antenna elements. Each beam former circuit generally comprises a plurality of transceiver channels comprising a transmit channel and a receive channel. The phased array antenna panel is generally configured to distribute a control signal to each of the beam former circuits. Each of the transceiver channels is generally configured to switch between a transmit mode and a receive mode in response to the control signal.

A differential amplifier includes a pre-driver stage, an input balun, a matching network, a differential transistor pair, a bias network and an output balun. An output terminal of the pre-driver stage is connected to an input terminal of the input balun. An output terminal of the input balun is connected to the matching network. An output terminal of the matching network is connected to an input terminal of the differential transistor pair and to the bias network. An output terminal of the differential transistor pair is connected to the output balun. A single-turn laminated transformer is used as the input balun of the present invention, and the output balun is of a structure having an inner full frame and an outer half frame, thereby making the differential amplifier have small occupation area, low loss, high operating frequency and high power amplification efficiency.

A method of operating an amplifier circuit having a transformer arranged so as to establish a magnetically coupled feedback loop between and output of an amplifier and an input of the amplifier. The method includes providing a DC bias current to the amplifier, and further includes increasing the DC bias current to improve a linearity of the amplifier circuit wherein a transfer gain of the amplifier circuit remains constant when the DC bias current is increased. A loop gain of the magnetically coupled feedback loop is set by selecting a coupling factor and turn-ratio of the transformer.

An RF front end provides high receive selectivity by selectively configuring matching networks within a Time Division Duplex transceiver. One or more elements of the transmit or receive signal paths are configured to perform multiple functions. Each of the functions can be performed in dependence on an operating mode of the RF front end. In some embodiments, one or more elements in the transmit or receive signal paths are reconfigured during receive portions of operation to provide additional receive selectivity.

Apparatus and methods for power amplifier systems with differential ground are provided. In certain implementations, a semiconductor die for a radio frequency communication system includes a differential ground network configured to distribute a ground voltage. The differential ground network is substantially symmetric with respect to a line of symmetry. The semiconductor die further includes a first differential power amplifier including a first half circuit and a second half circuit that operate differentially to provide amplification. The first half circuit and the second half circuit are symmetrically connected to the differential ground network. The semiconductor die can further include a second differential power amplifier, and the differential ground network serves to provide isolation between the first differential power amplifier and the second differential power amplifier.

A hybrid RF transceiver circuit comprises a first matching network, a second matching network, a first power amplifier, a second power amplifier, and a low noise amplifier. The second matching network is coupled to the first matching network and an antenna. An output port of the first power amplifier is coupled to the first matching network and the second matching network. The output port of the second power amplifier is coupled to the first matching network. The input port of the low noise amplifier is coupled to the second power amplifier and the first matching network. The output port of the low noise amplifier is coupled to a receiver circuit.

There is provided a phase-switch-equipped variable amplification device including a switch including one input port and two output ports and configured to output a single-ended signal input to the one input port into one of the two output ports, a first converter coupled to the two output ports of the switch and configured to convert the single-ended signal output from the switch into a pair of differential signals having phases different from each other by 180-degree and invert phases of the pair of differential signals in response to a switching operation at the switch, a variable amplifier configured to amplify the pair of differential signals in accordance with a control voltage, and a second converter configured to convert the pair of differential signals amplified by the variable amplifier into a single-ended signal.