An amplifier arrangement comprises N amplifier stages (10.sub.1 to 10.sub.N). The amplifier arrangement comprises a main cascade of quarter wavelength transmission lines coupled between an output of a main amplifier (10.sub.2) of the N amplifier stages (10.sub.1 to 10.sub.N) and an output node (15) of the amplifier arrangement, wherein the main cascade comprises N−1 quarter wavelength transmission lines (11.sub.1 to 11.sub.N−1). An output of one peaking amplifier (10.sub.N) of the N amplifier stages is coupled to the output node (15), and remaining peaking amplifiers (10.sub.1, 10.sub.3 to 10.sub.N−1) of the N amplifier stages coupled to respective junctions (12.sub.1 to 12.sub.N−2) in the main cascade of quarter wavelength transmission lines (11.sub.1 to 11.sub.N−1). The amplifier arrangement is further configured such that at least one of the quarter wavelength transmission lines in the main cascade is extended by a half wavelength transmission line (13) or multiples of half wavelength transmission lines, and/or at least one of the peaking amplifiers (10−.sub.1, 10.sub.3 to 10.sub.N) is coupled to its respective junction or output node (15) via a connecting half wavelength transmission line (13) or multiples of half wavelength transmission lines.

A high frequency signal amplifying circuitry of an embodiment includes a first splitter, a first amplifier, a second amplifier, a loop oscillation suppressor, and a combiner. The first amplifier includes a second splitter, a first carrier amplifier, a first peak amplifier, and a first combiner. The second amplifier includes a third splitter, a second carrier amplifier, a second peak amplifier, and a second combiner. The second carrier amplifier being adjacent to an associated the first carrier amplifier or the second peak amplifier being adjacent to an associated the first peak amplifier. The loop oscillation suppressor located between the second carrier amplifier and the associated first carrier amplifier or the second peak amplifier and the associated first peak amplifier.

An in-line waveguide divider divides power of an incoming high-frequency signal among openings. Amplification boards disposed on a base are provided for respective openings and are each connected in parallel with one another to the in-line waveguide divider. An in-line waveguide combiner includes openings formed correspondingly to the amplification boards, and is connected to the amplification boards. An electrically conductive amplifier cover includes walls formed to provide isolation between circuits of the amplification boards continuously from the in-line waveguide divider to the in-line waveguide combiner, and the entire surface of the amplification boards at the in-line waveguide combiner side is covered with the electrically conductive amplifier cover except openings and openings. Each of the amplification boards includes a waveguide-to-microstrip transition corresponding to the opening, an amplifier element, and a microstrip-to-waveguide transition corresponding to the opening.

Distributed amplifiers with controllable linearization are provided herein. In certain embodiments, a distributed amplifier includes a differential input transmission line, a differential output transmission line, and a plurality of differential distributed amplifier stages connected between the differential input transmission line and the differential output transmission line at different points or nodes. The distributed amplifier further includes a differential non-linearity cancellation stage connected between the differential input transmission line and the differential output transmission line and providing signal inversion relative to the differential distributed amplifier stages. The differential non-linearity cancellation stage operates with a separately controllable bias from the differential distributed amplifier stages, thereby providing a mechanism to control the linearity of the distributed amplifier.

An amplifier arrangement comprises N amplifier stages, wherein N is an integer equal or greater than five. The amplifier arrangement comprises a first cascade of quarter wavelength transmission line segments coupled to receive a first set of amplifier stages, and at least a second cascade of quarter wavelength transmission line segments coupled to receive a second set of amplifier stages. The first cascade and second cascade are connected to a common node, for example in parallel to an output node, or in parallel to an intermediate node.

A power amplifier circuit includes a first amplifier that amplifies a first signal, and a second amplifier arranged subsequent to the first amplifier. The second amplifier amplifies a second signal that is based on an output signal of the first amplifier. The first amplifier performs class inverse-F operation, and the second amplifier performs class F operation.

A multichannel transmission system which includes a calibration functionality that allows precise calibration of the frequency conversion chains and of the multiport amplifier of the system to be performed without interruption of service. The proposed calibration makes it possible to correct the defects over the entire frequency band of the system.

A wide band directional coupler is disclosed. The coupler includes a main transmission line connected between an input port and an output port; and a coupling transmission line having a first length and connected between a coupling port and an isolation port, wherein the coupling transmission line is coupled to the main transmission line through a coupling capacitive connection and a mutual inductive connection, wherein at least a distance between the main transmission line and the coupling transmission line varies along the first length of the coupling transmission line such that any one of a capacitance value of the capacitive connection and an inductance value of the inductive connection is characterized by a relatively low value, wherein a coupling factor of the wide band directional couple remains substantially constant throughout an operating frequency band of the wide band directional coupler.

An on-chip transformer circuit is disclosed. The on-chip transformer circuit comprises a primary winding circuit comprising at least one turn of a primary conductive winding arranged as a first N-sided polygon in a first dielectric layer of a substrate; and a secondary winding circuit comprising at least one turn of a secondary conductive winding arranged as a second N-sided polygon in a second, different, dielectric layer of the substrate. In some embodiments, the primary winding circuit and the secondary winding circuit are arranged to overlap one another at predetermined locations along the primary conductive winding and the secondary conductive winding, wherein the predetermined locations comprise a number of locations less than all locations along the primary conductive winding and the secondary conductive winding.

A high-frequency power amplifier apparatus includes: a plurality of amplifiers that respectively amplify a plurality of distributed signals obtained by distributing a high-frequency signal of a predetermined frequency, the amplifiers respectively outputting a plurality of amplified signals; and a cavity-type high-frequency power combiner having a cavity surrounded by a conductor wall, the cavity-type high-frequency power combiner combining together power of the plurality of amplified signals in the cavity by operating in a TE.sub.011 resonance mode with a resonance frequency equal to the predetermined frequency.