Abstract: A directional coupler is operably connected to each antenna of a transmitting transceiver that has multiple antennas, e and a tunable load is operably connected to each directional coupler. The directional couplers act to couple a co-located receiving transceiver to the antennas of the transmitting transceiver. Each tunable load is constructed based on a reflection coefficient (?) that is determined for that tunable load, in that the type of components and/or the values of some or all of the components that are used in the tunable load are determined based on the reflection coefficient (?) associated with that tunable load. The tunable loads cancel or reduce interferences experienced by the co-located receiving transceiver when the transmitting transceiver is transmitting using at least one of the multiple antennas.

Abstract: A directional coupler for co-located antennas contemplates coupling a first transceiver to an antenna through a directional coupler. A second transceiver is also coupled to the antenna using the directional coupler. When the first transceiver is transmitting, the second transceiver may receive through the antenna without suffering interference from signals transmitted by the first transceiver. To facilitate signal handling, a tunable or variable load may also be coupled to the directional coupler.

Abstract: A directional coupler for co-located antennas contemplates coupling a first transceiver to an antenna through a directional coupler. A second transceiver is also coupled to the antenna using the directional coupler. When the first transceiver is transmitting, the second transceiver may receive through the antenna without suffering interference from signals transmitted by the first transceiver. To facilitate signal handling, a tunable or variable load may also be coupled to the directional coupler.

Abstract: Balun circuit arrangement with a balanced port side having two balanced terminals and an unbalanced port side having an unbalanced terminal. A first series connection of a first inductive impedance element (L1) and a first capacitive impedance element (C1) is present between a negative terminal of the two balanced terminals and the unbalanced terminal. A second series connection of a second inductive impedance element (L2) and a third inductive impedance element (L3) is present between a positive terminal of the two balanced terminals and the unbalanced terminal, and a second capacitive element (C2) is connected between a node connecting the second and third inductive element and a ground connection. The balun circuit arrangement may be used in a combination with an oscillator circuit and a single ended antenna.

Abstract: Balun circuit arrangement with a balanced port side having two balanced terminals and an unbalanced port side having an unbalanced terminal. A first series connection of a first inductive impedance element (L1) and a first capacitive impedance element (C1) is present between a negative terminal of the two balanced terminals and the unbalanced terminal. A second series connection of a second inductive impedance element (L2) and a third inductive impedance element (L3) is present between a positive terminal of the two balanced terminals and the unbalanced terminal, and a second capacitive element (C2) is connected between a node connecting the second and third inductive element and a ground connection. The balun circuit arrangement may be used in a combination with an oscillator circuit and a single ended antenna.

Abstract: The invention refers to a Doherty power amplifier comprising a first power amplifier (Main PA) adapted to receive an input signal and adapted to provide a first output signal which is phase shifted with respect to the input signal. The amplifier further comprises a second power amplifier (Peak PA), adapted to receive a phase shifted input signal and adapted to provide a second output signal. The power amplifier is characterized in that at least one of the first or the second power amplifiers comprises a first driver power amplifier (T1) comprising a first gate input and a first drain output. The first driver power amplifier (T1) is coupled to a first output power amplifier (T2) comprising a second gate input and a second drain output. The first gate input and the second gate input are adapted to receive a control signal, the control signal being obtained after an envelope detection provided by an envelope detector coupled to the input signal.

Abstract: The invention refers to a Doherty power amplifier comprising a first power amplifier (Main PA) adapted to receive an input signal and adapted to provide a first output signal which is phase shifted with respect to the input signal. The amplifier further comprises a second power amplifier (Peak PA), adapted to receive a phase shifted input signal and adapted to provide a second output signal. The power amplifier is characterized in that at least one of the first or the second power amplifiers comprises a first driver power amplifier (T1) comprising a first gate input and a first drain output. The first driver power amplifier (T1) is coupled to a first output power amplifier (T2) comprising a second gate input and a second drain output. The first gate input and the second gate input are adapted to receive a control signal, the control signal being obtained after an envelope detection provided by an envelope detector coupled to the input signal.