A distributed amplifier includes a transmission line configured so as to transmit a signal, a variable capacitor having one end connected to the transmission line and the other end connected to the ground, and configured so that the capacitance is adjustable, and a variable capacitor having one end connected to the transmission line and the other end connected to the ground, and configured so that the capacitance is adjustable. The transmission line is configured in such a manner that the inductance is adjustable.

A reactance cancelling radio frequency (RF) circuit array is disclosed. The reactance cancelling RF circuit array includes multiple RF circuits each coupled to one or two adjacent RF circuits by one or two pairs of coupling mediums each having a respective length less than one-quarter wavelength. In one aspect, an RF input signal is first split across the RF circuits and then combined to form an RF output signal. As a result, each RF circuit requires a lower power handling capability to process a portion of the RF input signal. In another aspect, each pair of the coupling mediums can cause reactance cancellation in each reactance-cancelling pair of the RF circuits. By coupling the RF circuits via the coupling mediums and enabling splitting-combining among the RF circuits, it is possible to miniaturize the reactance cancelling RF circuit array for improved performance across a wide frequency spectrum.

A distributed amplifier includes: a transmission line having an input end that an input signal is input to; a transmission line having an output end that an output signal is output from; an input termination resistor connected to an end terminal of the transmission line; a plurality of unit cells arranged along the transmission lines, and having input terminals connected to the transmission line and output terminals connected to the transmission line; and a variable current source having one end connected to the end terminal of the transmission line and another end connected to a power supply voltage, and capable of adjusting a current amount between the transmission line and the power supply voltage.

A distribution amplifier for a communication device such as a gateway is provided. The distribution amplifier can receive an input signal and provide multiple output signals. The distribution amplifier can have a transmission line that receives the input signal and multiple amplifier stages that are connected to the transmission line to receive the input signal. The output of the amplifier stages correspond to the output signals from the distribution amplifier. The transmission line has equally spaced connection points for the amplifier stages. The transmission line can be designed to have an impedance that results in the impedance of the transmission line with the connected amplifier stages having a final impedance that matches the input impedance to the transmission line.

In a distributed amplifier, a plurality of cascode amplifiers connected in parallel between an input side transmission line and an output side transmission line are provided, a transmission line is connected to an input terminal of an output transistor of each of the amplifiers, and a bias potential is applied from a bias circuit to the input terminal of the output transistor via the transmission line.

CRLH lines including left-handed shunt inductors and left-handed series capacitors are provided on gate side transmission lines of a plurality of FETs.

A distribution amplifier for a communication device such as a gateway is provided. The distribution amplifier can receive an input signal and provide multiple output signals. The distribution amplifier can have a transmission line that receives the input signal and multiple amplifier stages that are connected to the transmission line to receive the input signal. The output of the amplifier stages correspond to the output signals from the distribution amplifier. The transmission line has equally spaced connection points for the amplifier stages. The transmission line can be designed to have an impedance that results in the impedance of the transmission line with the connected amplifier stages having a final impedance that matches the input impedance to the transmission line.

A travelling wave mixer (TWM) is provided that includes an input artificial transmission line configured to transmit an input signal, an output artificial transmission line configured to transmit an output signal, a local oscillator (LO) artificial transmission line configured to transmit an LO signal, and a plurality of mixer stages connected in parallel between the output artificial transmission and the input artificial transmission line. Each of the mixer stages includes an input amplifier, a mixer and an output amplifier connected in series between the input artificial transmission line and the output artificial transmission line, where an input of the mixer receives an output of the input amplifier, and an output of the mixer is applied to an input of the output amplifier. Further, each of the mixer stages includes a phase-adjustable LO amplifier circuit connected between the LO artificial transmission line and an LO input of the mixer, where the phase-adjustable LO amplifier is configured to adjust an LO signal phase applied to the LO input of each mixer to null out a phase error in each mixer stage independently.

Systems are provided for RF high power generation. An arrangement includes an RF power combiner, at least one RF power amplifier, a switch, a control unit, and a transmission line. The RF power combiner has at least one RF input and at least one RF output. The RF power amplifier is electrically connected to the RF input via the transmission line. The switch is included in the transmission line. The switch is configured to control, by a switching action, transmission of a RF signal from the RF power amplifier to the RF input via the transmission line. The control unit is electrically connected to the switch. The control unit is configured to control the switching action of the switch. The control unit is electrically connected to the switch via the same transmission line.

Distributed amplifier systems and methods are disclosed. An example distributed amplifier system includes first stage traveling wave amplifier (TWA) circuitry that is controllable to provide one of a first set of discrete gain settings. The first stage TWA circuitry includes a first input transmission line, a first output transmission line, and a first plurality of amplifiers coupled antiparallel between the first input transmission line and the first output transmission line. The first set of discrete gain settings has approximately constant logarithmic spacing.