Abstract: An acoustic wave device is provided with a low-frequency side filter having a low-frequency side passband, a high-frequency side filter having a high-frequency side passband, and first and second balanced terminals. The low-frequency side filter is connected to a first unbalanced terminal. The low-frequency side passband is a frequency band from a first minimum frequency to a first maximum frequency. The high-frequency side filter is connected to a second unbalanced terminal. The high-frequency side passband is a frequency band from a second minimum frequency to a second maximum frequency. The low-frequency side filter includes a first longitudinally-coupled acoustic wave resonator and a first one-terminal pair acoustic wave resonator connected in series to the first longitudinally-coupled acoustic wave resonator. An antiresonant frequency of the first one-terminal pair acoustic wave resonator is set to be higher than the first maximum frequency and lower than the second minimum frequency.

Abstract: A waveguide converter includes a waveguide including a hollow section through which a signal is transmitted and a first opening formed on a cross section of the hollow section in a direction orthogonal to a transmission direction of the signal, and a circuit board including on a same surface a signal line, a conductor patch connected to the signal line, and a second opening surrounding the conductor patch. The waveguide is fixed onto the circuit board. The first opening surrounds the second opening. The conductor patch includes a rectangular section which has short sides in parallel with short sides of the first opening, and has a first long side and a second long side connected to the signal line in parallel with long sides of the first opening, and protruding portions which are provided so as to touch the short sides near both ends of the second long side, respectively.

Abstract: A filter includes: a filter circuit connected between a first terminal and a second terminal; and a matching circuit connected between the filter circuit and the second terminal, wherein an impedance viewed from the second terminal toward the matching circuit is less than an impedance viewed from a node between the filter circuit and the matching circuit toward the filter circuit.

Abstract: This disclosure provides systems, methods and apparatus for a compact 3-D coplanar transmission line (CTL). In one aspect, the CTL has a proximal end and a distal end separated, in a first plane, by a distance D, the first plane being parallel to a layout area of a substrate. The plane is defined by mutually orthogonal axes x and z The CTL provides a conductive path having pathlength L. D is substantially aligned along axis z, L is at least 1.5×D, and the CPW is configured such that at least one third of the pathlength L is disposed along one or more directions having a substantial component orthogonal to the first plane. Less than one third of the pathlength L is disposed in a direction having a substantial component parallel to axis x.

Abstract: A noise filter disclosed herein is configured to suppress a common mode voltage that is generated in cables connected to an electric power converter. The noise filter includes: detecting capacitors connected to the cables, respectively, and configured to detect the common mode voltage; an operational amplifier having a positive input terminal via which the common mode voltage detected by the detecting capacitors is inputted; an emitter follower circuit having an input terminal connected to an output terminal of the operational amplifier and having an output terminal connected to a negative input terminal of the operational amplifier; and a transformer configured to apply a compensating voltage to each of the cables by applying a voltage at the output terminal of the emitter follower circuit to each of the cables in opposite phase.

Abstract: In one embodiment, a non-dispersive phase shifter includes a composite right- and left-handed (CRLH) circuit that can be toggled between a first phase delay state and a second phase delay state with a substantially constant phase shift over a range of frequencies.

Abstract: A squaring circuit has current mode triplet metal oxide semiconductor (MOS) devices, including a first MOS device, a second MOS device and a third MOS device each having a source operably coupled to a first current source; and a fourth MOS device, a fifth MOS device and a sixth MOS device each having a source operably coupled to a second current source. The drain of first and fourth MOS device is operably coupled to a first supply, the drain of second and fifth MOS device is operably coupled to a first differential output port and the drain of third and sixth MOS device is operably coupled to a second differential output port. The gate of first, second and sixth MOS device is connected to a first differential input port, and the gate of third, fourth and fifth MOS device is connected to a second differential input port.

Abstract: Disclosed is an impedance matching apparatus performing impedance matching between a front-end module and an antenna. The impedance matching apparatus includes an RF front end providing a multi-band RF signal, a reflected power measuring module measuring a reflection coefficient for the RF input signal, a matching unit adjusting impedance so that the reflection coefficient is minimized, a first switch module provided in the RF front end to selectively switch the RF signal onto a bypass path, and a controller allowing the RF signal to be switched onto the bypass path if a specific frequency range is detected from the reflection coefficient.

Abstract: In a filter module capable of handling multiple bands, cross wiring with an RF-IC is to be solved. The filter module includes: an antenna terminal; first and second transmission filters; first and second reception filters; a first switch circuit connected to the antenna terminal, and selectively connected to the first and second transmission filters; a second switch circuit connected to the antenna terminal, and selectively connected to the first and second reception filters; a first matching circuit connected between the first switch circuit and the first transmission filter or between the second switch circuit and the first reception filter; and a second matching circuit connected between the first switch circuit and the second transmission filter or between the second switch circuit and the second reception filter.

Abstract: One mixer circuit includes mixer elements having 3N pairs of differential inputs. There are non-overlapping clock signals provided to the mixer elements which have a duty cycle equal to or less than 33? percent, and N is a positive integer. Output differential signals of the mixer elements do not contain third order harmonic content of the non-overlapping clock signals. Another mixer circuit includes a first mixer element and a signal combining device. The first mixer element has 3N pairs of differential inputs, wherein there are non-overlapping clock signals provided to the first mixer element which have a duty cycle equal to or less than 33? percent, and N is a positive integer. The signal combining device combines outputs from the first mixer element wherein an output signal of the signal combining device do not contain third order harmonic content of the non-overlapping clock signals.

Abstract: Provided is a coaxial waveguide converter and a ridge waveguide that are insusceptible to manufacturing variances over a broad bandwidth. The coaxial waveguide converter includes a ridge waveguide (10) including a ridge (11) and a coaxial line (20). A projection (12) projecting toward a side of a waveguide space (13) is provided in the ridge (11), an amount of projection of the projection (12) decreases gradually from an end surface of the ridge waveguide (10) on a side of the coaxial line along a waveguide direction and an inner conductor (21) of the coaxial line (20) is inserted in the through-hole (14) at a position displaced from a center of the ridge waveguide (10) in a direction perpendicular to a direction in which the projection (12) projects in the end surface of the ridge waveguide (10) on the side of the coaxial line.

Abstract: The mobile phone includes an optical sensor, a display element, a pixel circuit portion where a plurality of pixels having a plurality of transistors are arranged in matrix, an optical sensor control circuit which is connected to an optical sensor driver circuit for driving the optical sensor and reads a signal from the optical sensor, a display portion control circuit which is connected to a display element driver circuit for driving the display element and outputs an image signal for displaying an image on a display portion, a gradient detection portion for outputting a signal in accordance with a gradient of the mobile phone, and an arithmetic circuit for performing display in the pixel circuit portion by switching image signals output to the display portion control circuit with a signal from the gradient detection portion.

Abstract: A duplexer includes: a transmission filter connected between a common terminal and a transmission terminal; and a reception filter connected between the common terminal and a reception terminal, wherein the reception filter includes resonators located on a piezoelectric substrate, at least one resonator of the resonators is grounded, and a resonator located at a side closest to the common terminal out of the grounded resonator is a divided resonator that is divided into two or more, and a resonance frequency fr of the divided resonator is in a range of fr=2×(fTL to fTH)?(fRL to fRH) when a pass frequency of the transmission filter is fTL to fTH and a pass frequency of the reception filter is fRL to fRH.

Abstract: A resonator according to the present invention includes a supporting substrate, a piezoelectric layer, a pair of excitation electrodes, and a bonding layer. The piezoelectric layer is made of a piezoelectric material. The pair of excitation electrodes is formed on the upper surface of the piezoelectric layer so as to excite bulk acoustic waves. The bonding layer has a cavity formed therein so as to face the excitation electrode pair through the piezoelectric layer, and the bonding layer bonds the supporting substrate to the lower surface of the piezoelectric layer.

Abstract: A level shifter circuit for low power applications that can shift the level of a digital signal that is below the threshold voltage of output transistors. The level shifter uses core transistors in the input stage and includes an intermediate stage that limits the voltage applied to the drain of the core transistors. The intermediate stage may include two transistors whose gate is connected to a reference voltage and turns off when the voltage at their source is equal to a threshold voltage below the reference voltage, thus limiting the maximum voltage applied to the transistors present in the input stage.

Abstract: A switching device includes: a switch that selects and connects one of input-output terminals to a common terminal; and a delay line that is connected in parallel to the switch between two terminals of the input-output terminals and delays a signal by using an acoustic wave.

Abstract: A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a combination of one or more techniques which reduce the digital current, minimize mutual inductance, utilize field cancellation, prevent leakage current, and/or manage impedance. These techniques may be used alone, or preferably, used on combination with one another.

Abstract: An acoustic wave device includes: a piezoelectric film made of an aluminum nitride film containing a divalent element and a tetravalent element, or a divalent element and a pentavalent element; and an electrode that excites an acoustic wave propagating through the piezoelectric film.

Abstract: A balance filter includes an unbalanced terminal, a first balanced terminal, a second balanced terminal, a ground terminal, an unbalanced-side coupling coil, a balanced-side coupling coil electromagnetically coupled to the unbalanced-side coupling coil, and an unbalanced-side capacitor. The unbalanced-side capacitor, the unbalanced-side coupling coil, and a portion of the balanced-side coupling coil define an LC parallel resonant circuit. A first end of the balanced-side coupling coil is a terminal having the same polarity as that of a first end of the unbalanced-side coupling coil. A second end of the unbalanced-side coupling coil is connected to the first end of the balanced-side coupling coil.

Abstract: An integrated circuit (IC) includes first and second circuits. The first circuit is manufactured using a process, has an input and an output, and has a first nonlinearity. The second circuit is manufactured using the process, has a first terminal connected to the output of the first circuit and a second terminal connected to the input of the first circuit, and has a second nonlinearity. The second nonlinearity (i) is equal and opposite to the first nonlinearity and (ii) cancels the first nonlinearity.