Disclosed are example embodiments of a circuit comprising a first inductor-capacitor (LC) loop, a second LC loop having at least one of a series connection or parallel connection to the first LC loop, and a gyrator coupled between the first LC loop and the second LC loop. In an example, the first LC and the second LC loop each include an inductive element (L) and a capacitive (C) element coupled to each other in series. In another example, the first LC and the second LC loop each include an inductive element (L) and a capacitive (C) element coupled to each other in parallel.

A filter device includes a multilayer body including dielectric layers, an input terminal, an output terminal, a ground terminal, a common electrode, a ground electrode, resonators, a shield electrode, and ground vias. A first ground via couples the shield electrode and the ground electrode via the common electrode. A second ground via directly couples the shield electrode and the ground electrode without passing the common electrode. A first via of a first resonator has one end coupled to the common electrode and another end coupled to the input terminal. A first plate electrode is coupled to the first via and at least partially overlaps the ground electrode when viewed in plan view. A second resonator includes second vias and a second plate electrode. The second plate electrode is coupled to the second via and at least partially overlaps the ground electrode when viewed in plan view in the stacking direction.

Circuits and methods for an amplifier (particularly LNAs) that achieve wideband output impedance matching and high gain while simultaneously rejecting out-of-band (OOB) harmonic frequencies. Some embodiments allow multiple modes of operation to allow selection of gain versus linearity characteristics. One aspect of the present invention is improvement of the linearity and sensitivity of a whole RF front end (RFFE) receiver chain by suppressing OOB gain within an LNA component at higher order harmonic frequencies. Another aspect of the present invention are new wideband and ultra-wideband LNA load circuits that, while achieving high frequency OOB rejection, maintain in-band high gain and wideband output impedance matching at the same time. Yet another aspect of the present invention are new ultra-wideband LNA output impedance matching circuits.

A filter includes a first input/output terminal, a second input/output terminal, a third input/output terminal, a fourth input/output terminal, a first stage resonant circuit connected between the first input/output terminal and the second input/output terminal, at least one intermediate stage resonant circuit, and a final stage resonant circuit connected between the third input/output terminal and the fourth input/output terminal. The first stage resonant circuit and the final stage resonant circuit each include an inductor. The at least one intermediate stage resonant circuit includes an inductor and a capacitor connected in parallel to each other, and one end of the inductor and one end of the capacitor connected in parallel to the inductor are connected to a reference potential.

An electronic component includes a stack including a plurality of first conductors and a plurality of second conductors. The plurality of first conductors include a first conductor group. The plurality of second conductors include a second conductor group arranged in a region adjacent to a region where the first conductor group is arranged. The plurality of first conductors further include a third conductor group arranged in a region adjacent to the region where the second conductor group is arranged and located to sandwich, with the region where the first conductor group is arranged, the region where the second conductor group is arranged. The first conductor group constitutes a plurality of parallel resonant circuits. The second conductor group constitutes a serial resonant circuit. The third conductor group constitutes another parallel resonant circuit.

A filter device includes a multilayer body in which multiple dielectric layers are stacked, a ground terminal, and a first LC parallel resonator, a second LC parallel resonator, and a third LC parallel resonator located in the multilayer body and magnetically coupled to each other. The first LC parallel resonator includes a first conductor, the second LC parallel resonator includes a second conductor, and the third LC parallel resonator includes a third conductor. The filter device further includes a connection conductor on a layer different from a layer on which the second conductor is located, a first via including one end connected to the first conductor and another end connected to the connection conductor, and a second via including one end connected to the third conductor and another end connected to the connection conductor. The connection conductor includes a first region that overlaps a portion of the second conductor in plan view of the multilayer body seen in a stacking direction.

A canceler device includes: a line connector having a first terminal, a second terminal, and a third terminal, the line connector being configured to output a signal provided to the first terminal to the second terminal; and a reflection circuit to output a reflected wave of the signal output to the second terminal to the third terminal. The reflection circuit includes: a first variable resistor having a first end connected to the second terminal; a second variable resistor having a first end connected to the second terminal and a second end grounded; and a parallel resonance circuit having a first end connected to a second end of the first variable resistor and a second end grounded.

A branching filter includes a first filter and a second filter. The first filter includes a first inductor. The second filter includes a second inductor. Each of the first inductor and the second inductor is wound about an axis extending in a direction orthogonal to a stacking direction of a stack. The first inductor is arranged at a position closer to a first end portion of the stack than to a second end portion of the stack. The second inductor is arranged at a position closer to the second end portion than to the first end portion.

An electronic component includes a first input/output port, a second input/output port, a third input/output port, a first circuit that is a characteristic impedance converter circuit provided between the first input/output port and the second input/output port, a second circuit that is a characteristic impedance converter circuit provided between the first input/output port and the third input/output port, and a third circuit provided between the second input/output port and the third input/output port, the third circuit having a circuit configuration where a complex conjugate relationship is made with each of the first and second circuits.

Techniques for isolation between filters using inductive coupling cancellation are disclosed. An apparatus includes a first filter including a first plurality of inductors and a second filter including a second plurality of inductors. The first and second filters are implemented physically adjacent to one another. First and second ones of the first plurality of inductors and a first one of the second plurality of inductors are polarized in a first direction, while a second one of the second plurality of inductors is polarized in a second direction opposite that of the first direction. The second one of the second plurality of inductors is physically adjacent to one of the first and second ones of the first plurality of inductors such that magnetic coupling currents induced into one another are canceled.