An inductor device includes a first inductor unit and a second inductor unit. The first inductor unit includes a first side to a fourth side, a first wire, and a first input terminal. The first wire is winded to form a plurality of circles. The first wire is winded in an interlaced manner at one of the first to fourth sides of the first inductor unit. The first input terminal is disposed on one of the first to fourth sides. The second inductor unit includes a fifth side to an eighth side, a second wire, and a second input terminal. The second wire is winded to form a plurality of circles. The second wire is winded in an interlaced manner at one of the fifth to eighth sides of the second inductor unit. The second input terminal is disposed on one of the fifth to eighth sides.

Disclosed herein is a differential mode filter that includes first and second terminal electrodes provided on a first flange part of a core, and first and second wires wound around a winding core part of the core in an opposite direction to each other and connected respectively to the first and second terminal electrodes. The first and second wires cross each other on the winding core part to form a plurality of crossing portions that include first, second, and third crossing portions that are first, second, and third occurrences counting from the one end of the first and second wires, respectively. A first crossing angle between the first and second wires at the first crossing portion is larger than at least one of second and third crossing angles between the first and second wires at the second and third portions, respectively.

Disclosed herein is a differential mode filter that includes first and second terminal electrodes provided on a first flange part of a core, and first and second wires wound around a winding core part of the core in an opposite direction to each other and connected respectively to the first and second terminal electrodes. The first and second wires cross each other on the winding core part to form a plurality of crossing portions that include first, second, and third crossing portions that are first, second, and third occurrences counting from the one end of the first and second wires, respectively. A first crossing angle between the first and second wires at the first crossing portion is larger than at least one of second and third crossing angles between the first and second wires at the second and third portions, respectively.

An inductor is disclosed, including a first wire, a non-conductive material, and a shell. The non-conductive material may cover the first wire, with a portion of each end of the first wire uncovered. The shell may include a top portion and a bottom portion and include at least one magnetized layer and at least one gap between the first portion and the second portion. The shell may also surround a portion of the non-conductive material.

An inductor is disclosed, including a first wire, a non-conductive material, and a shell. The non-conductive material may cover the first wire, with a portion of each end of the first wire uncovered. The shell may include a top portion and a bottom portion and include at least one magnetized layer and at least one gap between the first portion and the second portion. The shell may also surround a portion of the non-conductive material.

An inductor device includes a first and a second inductor. First inductor includes plural first wires and a first connection member. Second inductor includes plural second wires and a second connection member. Part of first wires are winded/located at a first area, and part of first wires are winded/located at a second area. First and second areas are located on two opposite sides of inductor device. First connection member connects first wire located at first area and located at second area. Part of second wires are winded/located at first area, and part of second wires are winded/located at second area. One terminal of second connection member connects a terminal of second wire at an inner side of inductor device, and another terminal of second connection member is disposed outside inductor device. First and second inductors are symmetrical with respect to a center line of inductor device.

A power conversion apparatus including a circuit board, a transformer, a first circuit, a second circuit, a first main coil, and a second main coil is provided. The transformer, the first circuit, and the second circuit are disposed on the circuit board. The transformer has a first winding and a second winding. The first circuit is coupled to and provides an input voltage to the first winding. The first end of the second winding is configured to provide an output voltage. The second circuit is coupled to the second winding. The first main coil is coupled to the first circuit. The second main coil is printed on the circuit board and coupled between the second circuit and a first reference potential terminal. The first main coil and the second main coil are electrically insulated from each other and magnetically coupled to each other. The first circuit and the second circuit perform digital signal communication through the first main coil and the main second coil to control the voltage value of the output voltage.

An RF frontend circuit includes an RF transceiver and a frequency synthesizer to perform frequency synthetization in a wide frequency spectrum. The frequency synthesizer generates an LO signal to the RF transceiver. The frequency synthesizer includes a quadrature signal generator to generate a quadrature LO signal based on the LO signal. The quadrature signal generator includes a first transformer. A first primary winding of the first transformer is disposed on a first substrate layer of the IC and a secondary winding of the first transformer is disposed on a second substrate layer of an IC. A second transformer is coupled to the first transformer in series. A second primary winding of the second transformer is disposed on the first substrate layer of the IC and a secondary winding of the second transformer is disposed on the second substrate layer of the IC.

An RF frontend circuit includes an RF transceiver and a frequency synthesizer to perform frequency synthetization in a wide frequency spectrum. The frequency synthesizer generates an LO signal to the RF transceiver. The frequency synthesizer includes a quadrature signal generator to generate a quadrature LO signal based on the LO signal. The quadrature signal generator includes a first transformer. A first primary winding of the first transformer is disposed on a first substrate layer of the IC and a secondary winding of the first transformer is disposed on a second substrate layer of an IC. A second transformer is coupled to the first transformer in series. A second primary winding of the second transformer is disposed on the first substrate layer of the IC and a secondary winding of the second transformer is disposed on the second substrate layer of the IC.

Apparatus for communicating across an isolation barrier. In one embodiment, the apparatus comprises a transformer having a first winding disposed on a first side of a printed circuit board (PCB) and coupled to a first local ground, and a second winding disposed on a second side of the PCB, the second side opposite to the first side, and coupled to a second local ground; a transmitter coupled to the first winding; and a receiver, coupled the second winding, that generates an output signal based on a signal received from the transmitter.