An electronic circuit includes an input matching network, a tunable resonator, a fixed output matching network and a transistor. The tunable resonator includes a varactor and an inductor connected in series. The output matching network includes at least one shunt open-stub connected to the output of the inductor in the tunable resonator and at least one transmission line connected to the at least one shunt open-stub. The transistor includes a gate connected to the input matching network, a source connected to ground, and a drain directly connected to an input of the tunable resonator.

An electronic circuit includes an input matching network, a tunable resonator, a fixed output matching network and a transistor. The tunable resonator includes a varactor and an inductor connected in series. The output matching network includes at least one shunt open-stub connected to the output of the inductor in the tunable resonator and at least one transmission line connected to the at least one shunt open-stub. The transistor includes a gate connected to the input matching network, a source connected to ground, and a drain directly connected to an input of the tunable resonator.

A Wilkinson Combiner circuit is disclosed. The circuit includes first and second input ports, and a resistive-capacitive (RC) network coupled there between. The circuit further includes an amplifier having an amplifier input node, and a coupled inductor. The coupled inductor includes first, second, and third terminals, coupled to the first input port, the second input port, and the amplifier input node, respectively. Signals conveyed from the first and second input ports are passed through the corresponding portions of the coupled inductor, are combined into a composite signal and amplified by the amplifier.

A Wilkinson Combiner circuit is disclosed. The circuit includes first and second input ports, and a resistive-capacitive (RC) network coupled there between. The circuit further includes an amplifier having an amplifier input node, and a coupled inductor. The coupled inductor includes first, second, and third terminals, coupled to the first input port, the second input port, and the amplifier input node, respectively. Signals conveyed from the first and second input ports are passed through the corresponding portions of the coupled inductor, are combined into a composite signal and amplified by the amplifier.

An inductor includes a substrate, and a first coil pattern disposed on one surface of the substrate and having a spiral shape comprising a plurality of turns, wherein as the first coil pattern extends inwardly towards a center of the first coil pattern, a pattern width of the first coil pattern decreases while a center-to-center distance between two adjacent turns of the first coil pattern increases.

The invention relates to high-frequency amplifier apparatuses suitable for generating power outputs of at least 1 kW at frequencies of at least 2 MHz. The apparatuses include two LDMOS transistors each connected by their source connection to ground. The transistors can have the same design and can be arranged in an assembly (package). The apparatus also includes a circuit board lying flat against a metallic cooling plate and connected to the cooling plate, which can be connected to ground, and the assembly is arranged on or against the circuit board. The apparatuses have a power transformer, whose primary winding is connected to the drain connections of the transistors, and a signal transmitter. A secondary winding of the signal transmitter is connected to the gate connections of the two transistors. Each of the gate connections is connected to ground via at least one voltage-limiting structural element.

The invention relates to high-frequency amplifier apparatuses suitable for generating power outputs of at least 1 kW at frequencies of at least 2 MHz. The apparatuses include two LDMOS transistors each connected by their source connection to ground. The transistors can have the same design and can be arranged in an assembly (package). The apparatus also includes a circuit board lying flat against a metallic cooling plate and connected to the cooling plate, which can be connected to ground, and the assembly is arranged on or against the circuit board. The apparatuses have a power transformer, whose primary winding is connected to the drain connections of the transistors, and a signal transmitter. A secondary winding of the signal transmitter is connected to the gate connections of the two transistors. Each of the gate connections is connected to ground via at least one voltage-limiting structural element.

Embodiments provide an amplification circuit, an apparatus for amplifying, a low noise amplifier, a radio receiver, a mobile terminal, a base station, and a method for amplifying. An amplification circuit for amplifying a radio signal comprises a first amplification stage configured to amplify an input signal, V.sub.in(t), to obtain an intermediate signal. The amplification circuit further comprises a cascoding circuit configured to amplify the intermediate signal to obtain a first output signal V.sub.outn(t). The amplification circuit further comprises a second amplification stage configured to amplify the intermediate signal to obtain a second output signal, V.sub.outp(t).

Embodiments provide an amplification circuit, an apparatus for amplifying, a low noise amplifier, a radio receiver, a mobile terminal, a base station, and a method for amplifying. An amplification circuit for amplifying a radio signal comprises a first amplification stage configured to amplify an input signal, V.sub.in(t), to obtain an intermediate signal. The amplification circuit further comprises a cascoding circuit configured to amplify the intermediate signal to obtain a first output signal V.sub.outn(t). The amplification circuit further comprises a second amplification stage configured to amplify the intermediate signal to obtain a second output signal, V.sub.outp(t).

A reconfigurable low-noise amplifier (LNA) is disclosed. The reconfigurable LNA includes amplifier circuitry having a gate terminal coupled to an input terminal, a source terminal coupled to a fixed voltage node, and a drain terminal coupled to an output terminal. The reconfigurable LNA further includes a gamma inverting network (GIN) coupled between the input terminal and the fixed voltage node, wherein the GIN has a first switch configured to disable the GIN during operation at first frequencies within a lower frequency band relative to a higher frequency band and to enable the GIN during operation at second frequencies within the higher frequency band.