Abstract: A band-pass filter includes a plurality of resonators, a feedback capacitive device and a grounding inductance device. A first end of each resonator is connected to a first node, and a second end of each resonator is connected to a second node. The feedback capacitive device is formed on the feedback circuit from the first node to the second node. The grounding inductance device is connected to the second node and ground. In an embodiment, the resonator essentially consists of a capacitive device and an inductance device.

Abstract: An integrated circuit (IC) inductor structure is provided with transverse electrical interfaces. The inductor structure is formed on at least one IC circuit layer and has a first axis planar to a circuit layer surface, bisecting the inductor into opposite first and second sides. An input interface is formed on the circuit layer and connected to the inductor first side, parallel to a second axis, which is perpendicular to the first axis. An output interface is formed on the circuit layer and connected to the inductor second side, parallel to the second axis. In one aspect, the inductor has a center tap electrical interface parallel to the axis. In another aspect, the inductor includes a three-dimensional (3D) loop formed over a plurality of the circuit layers.

Abstract: A duplexer includes an antenna terminal, a transmission amplifier terminal and a reception amplifier terminal. The transmission amplifier terminal is coupled to the antenna terminal via a transmission filter. The reception amplifier terminal is coupled to a reception filter and the reception filter is coupled to the antenna terminal via a band-stop filter.

Abstract: An electrical filter includes a circuit board with an insulative substrate of alternating wide and narrow portions between input and output ends. Capacitors received in through-holes in the wide portions are electrically coupled to signal traces on a signal surface and ground traces on a ground surface of the circuit board. Conductive coils about narrow portions may form inductors, electrically coupled between the signal traces and an input and/or output. The circuit board, capacitors and inductors may be positioned in a first enclosure, (e.g., tube), with sealed electrical connections to an exterior. The first enclosure may be positioned in a second enclosure (e.g., tube). The filter may also include a high frequency dissipation filter section employing a metal powder filter, with metal powder and epoxy. Non-magnetic and/or superconducting materials may be employed.

Abstract: A filter circuit is provided having multipath interference mitigation. The filter includes a signal path extending from an input to an output. The signal path includes a conductive path and a ground. A pass band filter is disposed along the signal path between the input and the output. The pass band filter passes a first frequency spectrum in a provider bandwidth, and attenuates a second frequency spectrum in a home network bandwidth. The filter circuit further includes a multipath interference mitigation leg operatively branched from the signal path. The multipath interference mitigation leg increases a return loss of the home network bandwidth. A frequency response of the filter circuit is characterized by an insertion loss characteristic between the input and the output being less than 3 dB in the provider bandwidth, and more than 20 dB in the home network bandwidth.

Abstract: In a band-pass filter of a delay line, an input terminal and a first resonator adjacent to the input terminal are coupled through a capacitor. The first resonator and a second resonator adjacent to the first resonator are coupled through a capacitor. The second resonator and a third resonator adjacent to the second resonator are coupled through an inductance. The third resonator and a fourth resonator adjacent to the third resonator are coupled through a capacitor. The fourth resonator and an output terminal adjacent to the fourth resonator are coupled through a capacitor.

Abstract: A band pass filter is suitable to be formed in a multi-layered circuit substrate of a wireless communication module. The band pass filter includes an input port, a first inductor, a first capacitor, a first parasitic capacitor, a second capacitor, a second inductor, a second parasitic capacitor, a third inductor, a third parasitic capacitor and a output. The input port, first inductor, first capacitor, second capacitor, third inductor and output port are sequentially electrically connected in series. The first parasitic capacitor is induced between the first inductor, first capacitor and a ground. The second inductor is electrically connected to the first capacitor, second capacitor and ground. The second parasitic capacitor is induced between the second inductor, first capacitor, second capacitor and ground. The second parasitic capacitor is electrically connected in parallel with the second inductor. The third parasitic capacitor is induced between the third inductor, second capacitor and ground.

Abstract: A notch filter suitable for attenuating certain frequencies of a radio-frequency signal includes an input for receiving the radio-frequency signal and an output for the output of a portion of the radio-frequency signal, first and second capacitive means, at least one inductor and a negative resistance circuit suitable for compensating the resistive losses of said at least one inductor. The inductor and the first and second capacitive means are placed to produce a resonator and the filter comprises a control device suitable for controlling the negative resistance circuit. The input impedance of the filter comprises a pole and a zero, with the pole depending on the second capacitive means and the zero depending on both the first and second capacitive means. The first and second capacitive means are variable and the control device is suitable for controlling the first and second capacitive means.

Abstract: A filter cut-off frequency correction circuit, inputted with a step function increasing from a first voltage to a second voltage, comprises a linear passive filter, for integrating the step function to obtain a third voltage; a first comparator, outputting a first high-level signal when the third voltage is greater than a first predetermined reference voltage; a second comparator, outputting a second high-level signal in a first period from the time that the second voltage is applied to the time that the first comparator outputs the first high-level signal; a counter, for counting a number of clock pulses of a reference clock inputted in the first period; a digital block, for calculating a variation rate of time constant according to the number of clock pulses of the reference clock, and generating a correction code; and a filter, for correcting the cut-off frequency according to the correction code. The correction circuit can improve the speed of cut-off frequency adjustment.

Abstract: A unit of a metamaterial includes an uppermost part electrode, a lowermost part electrode, a first internal electrode, a second internal electrode, a third internal electrode, a fourth internal electrode, and a transmission line. The transmission line connects a section of the uppermost part electrode which extends in the ?z direction to a section of the lowermost part electrode which extends in the +z direction. The length of the transmission line is set to substantially ½ of a resonant wavelength. The first internal electrode and the fourth internal electrode are respectively placed so as to be opposed to the uppermost part electrode and the lowermost part electrode. The first internal electrode and the fourth internal electrode are not electrically connected directly to each other.

Abstract: To suppress changes in capacitance due to displacement between electrodes opposing each other across a dielectric layer, thereby allowing stable manufacturing of a capacitance device having a desired capacitance. The capacitance device according to the present invention is of a configuration including a dielectric layer (10), a first electrode (11) formed on a predetermined surface (10a) of the dielectric layer (10), and a second electrode (12) formed on a surface (10b) on the opposite side of the dielectric layer (10) from the predetermined surface (10a). The forms of the first and second electrodes (11, 12) are set so that even in the event that the first electrode (11) is relatively displaced regarding position in a predetermined direction as to the second electrode (12), the area of the opposing-electrode region between the first electrode (11) and to the second electrode (12) is unchanged.

Abstract: A filter includes a first port, a second port, a first fractal curve based filter element coupled to the first port, and a second fractal curve based filter element coupled to the second port. The first fractal curve based filter element has first electromagnetic properties and the second fractal curve based filter element has second electromagnetic properties. The first fractal curve based filter element is electromagnetically coupled to the second fractal curve based filter element to filter radio frequency (RF) signals.

Abstract: The invention can provide a miniaturized noise filter. The noise filter for reducing noise comprises a coil with a conductive wire (2) wound around a core (1); a case (6) formed of an insulating material receiving the coil; a bracket (8) of a magnetic material forming a flux path of magnetic flux generated from the coil, which places the case thereon, which has a pair of end plates (12a, 12b) disposed opposite to both ends of the core of the coil respectively through a gap of a predetermined distance, and which has a bottom plate (8a) disposed between the pair of the end plates; and an input/output terminal (3a, 3b) for the coil.

Abstract: A filter circuit formed on a semiconductor chip, includes an input node provided to input an input signal; an output bonding pad provided to output an output signal; a ground bonding pad provided to be connected a ground through a bonding wire; a parallel resonant circuit provided between the input node and the output bonding pad and having one end connected to the output bonding pad; and a serial resonant circuit having one end which is provided between the input node and the other end of the parallel resonant circuit and the other end connected with the ground bonding pad. The serial resonant circuit includes a capacitor and an inductor which are connected in serial, and the parallel resonant circuit includes a capacitor and an inductor which are connected in parallel.

Abstract: A variable frequency resonator includes a series resonance circuit and a parallel resonance circuit. The series resonance circuit includes a first inductor, a first capacitor and a variable capacitance diode which are connected together in series. A reverse bias voltage is applied to the variable capacitance diode. A signal source is connected to the series resonance circuit. The parallel resonance circuit includes a second inductor and a second capacitor which are connected together in parallel. One terminal of the parallel resonance circuit is connected to a connection point between the first inductor and the first capacitor, and the other terminal of the parallel resonance circuit is connected to a connection point between the variable capacitor and the one terminal of the signal source.

Abstract: The invention relates to a high-pass filter comprising a signal line with several capacitors connected in series as well as a ground line, wherein several inductors are connected between the signal line and the ground line. In order to configure the high-pass filter as a coaxial construction it is suggested in accordance with the invention that the signal line form an inner conductor and the ground line an outer conductor of a coaxial conductor, between which an insulation layer is arranged, and that the inductors be designed as discrete components which are arranged at a distance to one another and between which at least one impedor is connected.

Abstract: Parameters of a radio frequency filter can be changed by changing structure of each component of the filter. Material of each component, diameters of each of magnetic cylinders, density of each of conductive coils, and thickness of each of dielectric layers can be changed. When any component needs to be replaced, the filter can be detached as needed.

Abstract: A system includes a filter and a tuner formed on an integrated circuit. The filter receives an input signal comprising a first number of channels and communicates an intermediate output signal comprising a second number of channels less than the first number of channels. The tuner is coupled to the filter and receives the intermediate output signal and communicates an output signal comprising a third number of channels less than the second number of channels.

Abstract: The present invention relates to a tunable circuit, or admittance, arrangement comprising at least one capacitive branch with at least a tunable first capacitor, and tuning application means. It further comprises at least one resonant branch comprising at least a second capacitor and an inductor, said second capacitor and said inductor being connected in series. Said at least one capacitive branch and said at least one resonant branch are connected in parallel, and said tuning application means are adapted for application of a DC tuning voltage. The capacitance of said first and/or second capacitor and/or the inductance of said inductor are selected such that the frequency dependency of the tunability of a varactor arrangement forming the equivalent varactor arrangement of the admittance arrangement can be controlled at least in a selected frequency range.

Abstract: A filter device (10) for filtering high-frequency interferences, such as due to switching flanks of a DC converter, has a current path (4) between an input (2) and an output (3), and an inductor (L) in the current path (4), wherein the inductor (L) is disposed in the current path (4) as a first component and is connected to the input (2), and wherein a reverse polarity protective diode (D) is disposed in series with the inductor (L) downstream thereto.

Abstract: There is provided a filter for receiving a rectangular or stepped source voltage to be filtered and for providing an output voltage, the filter including means arranged to determine the output voltage in dependence on the frequency components of the source voltage within the filter passband, and independent of output current drawn.

Abstract: A chip filter and supplementary tool combination is disclosed. The chip filter includes a insulative holder base having two arrays of wire grooves arranged along two opposing sidewalls thereof and soldering zones defined in a finished surface on each sidewall corresponding to the wire grooves, connection terminals each having a base portion respectively embedded in the soldering zones in the sidewalls of the insulative holder base and a soldering surface respectively kept in flush with the top edge of the associating sidewall, and filter elements having lead wires thereof respectively extending out of the insulative holder base through the wire grooves and respectively rested on the soldering surfaces of the connection terminals and held down in position by the supplementary tool for soldering by an automatic soldering machine.

Abstract: A method of constructing a band-stop filter comprises designing a band-stop filter including a signal transmission path, resonant elements disposed along the signal transmission path, and non-resonant elements coupling the resonant elements together to form a stopband having transmission zeroes corresponding to respective frequencies of the resonant elements. The method further comprises changing the order in which the resonant elements are disposed along the signal transmission path to create different filter solutions, computing a performance parameter for each filter solution, comparing the performance parameters to each other, selecting one of the filter solutions based on this comparison, and constructing the band-stop filter using the selected filter solution.

Abstract: An electronic device includes a semiconductor device; and a mounting substrate mounted with the semiconductor device and connected with predetermined voltages. The semiconductor device includes a filter circuit section configured to output a harmonic component of an input signal other than a desired frequency component to the mounting substrate and output the desired frequency component to an output node of the filter circuit section. The filter circuit section includes an inductor which is larger than a parasitic inductance component in the mounting substrate.

Abstract: A vehicle-mounted noise filter which suppresses electric field coupling between input and output terminals in the FM radio band, thereby allowing noise attenuation performance, which should originally be provided to a noise filter circuit, to be exhibited even in the FM radio band. The vehicle-mounted noise filter comprises a coil (1) obtained by winding a conductive wire around a magnetic core, input and output terminals (2, 3) electrically connected to both terminals of the coil, and a shielding member (4). The shielding member (4) is made of a conductive member which is grounded and disposed so as to shield the electric field between the input and output terminals (2, 3). The noise filter can also be configured using a capacitor having one terminal electrically connected to the coil (1) and the other terminal grounded.

Abstract: Embodiments described a semiconductor integrated circuit includes: a first coil and a second coil which have a mutual coupling and are connected in parallel to each other; a third coil connected in series to the first coil and the second coil; a first capacitor connected in parallel to the first coil; a second capacitor connected in parallel to the second coil; a first input terminal connected to an end of the first coil and an end of the first capacitor; a second input terminal connected to an end of the second coil and an end of the second capacitor; and an input-signal supplying portion configured to supply input signals of opposite phases to the first input terminal and the second input terminal, respectively.

Abstract: A semiconductor device interconnecting unit configured to input/output a high-frequency signal having a millimeter wave band to/from a semiconductor device is provided. The semiconductor or device interconnecting unit includes a part of a band pass filter configured to pass therethrough the high-frequency signal having a millimeter wave band by using an LC resonance circuit, and a remainder of the band pass filter, wherein the part and the remainder are separated from each other. The part is provided inside the semiconductor device, and the remainder is provided outside the semiconductor device. The part and the remainder include capacitors having variable capacitors added thereto, respectively. A pass band for the high-frequency signal having a millimeter wave band is changed by changing capacitance values of the variable capacitors.

Abstract: In a laminated band-pass filter, a capacitance is formed between a ground electrode of a ground electrode formation layer and each of capacitor electrodes of capacitor electrode formation layers. An even number of LC parallel resonators is arranged such that via electrodes and line electrodes define a plurality of inductor electrodes and, when viewed in a direction in which the inductor electrodes are arranged, the surfaces of the loops of the inductor electrodes overlap each other at least partially. The loops defined by the inductor electrodes of neighboring LC parallel resonators have opposite directions. The capacitor electrodes have a shape and distribution or arrangement having point symmetry in plan view.

Abstract: A dynamic harmonic filter for an AC power system comprising at least one voltage source and at least one load is provided. The harmonic filter comprises a current sensing or voltage injection transformer connected in series with the voltage source and the load. One end of the primary of the transformer is connected to the voltage source, and the other end is connected to the load. The harmonic filter further comprises a parallel resonant LC circuit tuned to the fundamental frequency of the power system. One end of the secondary (S2) of the current injection of the voltage sensing transformer is connected to one junction of the parallel resonant LC circuit and the other end of the secondary of the current injection or voltage sensing transformer is connected to the other junction of the parallel resonant LC circuit through the secondary (S1) of the current sensing or voltage injection transformer.

Abstract: A semiconductor device has a substrate and RF coupler formed over the substrate. The RF coupler has a first conductive trace with a first end coupled to a first terminal of the semiconductor device, and a second conductive trace with a first end coupled to a second terminal of the semiconductor device. The first conductive trace is placed in proximity to a first portion of the second conductive trace. An integrated passive device is formed over the substrate. A second portion of the second conductive trace operates as a circuit component of the integrated passive device. The integrated passive device can be a balun or low-pass filter. The RF coupler also has a first capacitor coupled to the first terminal of the semiconductor device, and second capacitor coupled to a third terminal of the semiconductor device for higher directivity. The second conductive trace is wound to exhibit an inductive property.

Abstract: A multi-layered component is disclosed, including at least one inductive region, wherein the inductive region includes a ferrite ceramic. The inductive region has electrode structures that form at least one inductance. The multi-layered component has at least one capacitive region, wherein at least one capacitive region includes a varistor ceramic. The capacitive region forms at least one capacitance. At least one inductive region and at least one capacitive region form at least one LC filter.

Abstract: For example, in a conventional high frequency switch used for a mobile phone and so on, high frequency distortion is caused by a diode which is turned off upon transmission. A high frequency switch includes a switch circuit for switching transmission and reception performed via a transmitting terminal and receiving terminals, said switch circuit having a diode turned off upon transmission, and a low-pass filter for suppressing high frequency distortion caused by the diode upon transmission.

Abstract: A signal transmission apparatus includes a first ground layer, a second ground layer and a band pass filter. The band pass filter includes a first transmission line positioned in a void defined in the first ground layer and a second transmission line positioned in a void defined in the second ground layer. Each of the first transmission line and the second transmission line includes a coil with a plurality of turns spirally extending in the same plane, a gasket extending from the coil and located in the center of the coil, and a signal terminal extending from extremity of the coil. According to employing the band pass filter, the signal transmission apparatus has filtering function, therefore, quality of signals transmitted through the signal transmission apparatus is improved.

Abstract: The invention relates to a selective active low-pass filter and to a method for improving the selectivity of such a filter. The method consists in centring, in the centre of the network, the resonant element whose frequency is closest to the cut-off frequency of the filter and in inserting in series with this element a negative resistance of higher value than the parasitic resistance of the filter.

Abstract: Parameters of a radio frequency filter can be changed by changing structure of each component of the filter. Material of each component, diameters of each of magnetic cylinders, density of each of conductive coils, thickness of a dielectric layer, and thickness of an insulation tube can be changed. When any component needs to be replaced, each cover is rotated, with connection partitions move to two slots of a resisting portion, to detach the filter.

Abstract: A multi-chip stack structure and a signal transmission method are disclosed in specification and drawing, where the multi-chip stack structure includes first and second chips. The first chip includes a first inductance coil with a first series capacitor, and the second chip includes a second inductance coil with a second series capacitor. The first and second inductance coils are magnetically coupled to each other. The magnetically coupled inductance coils and the capacitors constitute a coupling filter.

Abstract: Disclosed is a filter comprising an unbalanced input terminal and two balanced output terminals (a first balanced output terminal and a second balanced output terminal. A capacitor is connected between the first balanced output terminal and the GND, another capacitor is connected between the second balanced output terminal and the GND, and a first coil is connected between the first balanced output terminal and the second balanced output terminal.

Abstract: Parameters of a radio frequency filter can be changed by changing structure of each component of the filter. Material of each component, diameters of each of magnetic cylinders, density of each of conductive coils, thickness of a dielectric layer, and thickness of an insulation tube can be changed. When any component needs to be replaced, each cover is rotated, with connection partitions moving to two slots of an insulation portion, to detach the filter.

Abstract: A circuit device having an inductor and a capacitor in parallel connection includes a planar inductor embedded in an insulating material layer, wherein the planar inductor has a winding wire portion, a first connection terminal and a second connection terminal. The first connection terminal and the second connection terminal are located at different elevations and have an overlapping region. A capacitor dielectric layer is located within the overlapping region between the first connection terminal and the second connection terminal, and the capacitor dielectric layer and the first connection terminal and the second connection terminal together form a capacitor.

Abstract: A harmonic suppression device includes a multilayer printed circuit board (PCB). The multilayer PCB includes a first layer, a second layer, and a third layer. The third layer is connected to the ground. The first layer is configured with a power amplifier, an input microstrip, a voltage divider microstrip, and an output microstrip. The power amplifier is operable to amplify radio frequency (RF) signals input using the input microstrip and to output the amplified RF signals using the output microstrip. The second layer is configured with a first microstrip and a second microstrip. One end of each of the first and second microstrips is connected to an alternative one of the first layer and the third layer by vias, and the other ends of the first and second microstrips are unattached so as to suppress harmonics on the power amplifier.

Abstract: Exemplary embodiments of the invention disclose receiver baseband filtering. In an exemplary embodiment, the filter device may comprise a continuous-time filter and a discrete-time filter operably coupled to the continuous time-filter. The discrete-time filter may include a passive infinite impulse response filter operably coupled between the continuous-time filter and an amplifier. The discrete-time filter may also include an active infinite impulse response filter operably coupled between an output of the amplifier and an input of the amplifier. The discrete-time filter may be configured to combine an output of the active infinite impulse response filter and an output of the passive infinite impulse response filter to form a composite signal. Furthermore, the amplifier may be configured to receive and amplify the composite signal.

Abstract: A preselect circuit maintains the dynamic range of a received RF input signal during bandpass filtering of the received RF input signal. The preselect circuit includes a Q-deficient passive bandpass filter for coupling to an antenna to receive a received RF input signal. The preselect circuit further includes a Q-enhancement circuit coupled to the Q-deficient passive bandpass filter, wherein the Q-enhancement circuit increases a Q-value of the Q-deficient passive bandpass filter by compensating for resistive inductive losses in the bandpass filter.

Abstract: According to one exemplary embodiment, a switching module includes a first harmonic phase tuning filter coupled to a first input of an RF switch. The first harmonic phase tuning filter is configured to provide an output impedance that substantially matches an input impedance of the RF switch at approximately a fundamental frequency and to provide a high impedance at approximately a harmonic frequency generated by the RF switch. The first harmonic phase tuning filter includes an LC circuit coupled between input and output terminals of the first harmonic phase tuning filter and tuned to provide the high impedance at approximately the harmonic frequency generated by the RF switch. The RF switching module further includes a second harmonic phase tuning filter coupled to a second input of the RF switch. The first and second harmonic phase tuning filters can be fabricated on a single semiconductor die.

Abstract: A bit slice circuit having transmit and receive modes of operation is described. The bit slice circuit comprises: first transmit circuitry and first receive circuitry operating in a first clock domain, wherein the first circuitry receives a first clock signal; second transmit circuitry and second receive circuitry operating in a second clock domain, wherein the second circuitry receives a second clock signal; transmit transition circuitry and receive transition circuitry, the transmit transition circuitry coupling the first transmit circuitry to the second transmit circuitry, the receive transition circuitry coupling the first receive circuitry to the second receive circuitry, wherein the transition circuitry receives the first and second clock signals; and a single phase mixer that generates the second clock signal, wherein the second clock signal has a first phase in the transmit mode of operation and second phase in the receive mode of operation.

Abstract: A common-mode filter including two input terminals and two output terminals and, in series between each input or output terminal and the ground, a capacitive element and a first inductive element.

Abstract: An LC composite component has a unique structure that makes it easy to set frequency characteristics while reducing a circuit area and the number of layers. The LC composite component includes a laminated body including a plurality of dielectric layers. The laminated body is produced by forming input and output electrodes and an LC resonant circuit therein. The LC composite component includes a capacitor, which includes an elongated electrode portion having an elongated shape. The elongated electrode portion faces a flat electrode portion having a flat shape, with one of the dielectric layers interposed therebetween. At the same time, the elongated electrode portion constitutes an open stub that is open at a tip end.

Abstract: The present invention concerns a load modulation arrangement adapted to be connected to an amplifying device. The load modulation arrangement comprises a first reactive element, a second reactive element and at least one variable capacitive element. Further, the load modulation arrangement comprises a quarter wave transforming element adapted to be connected to the first reactive element. The present invention also concerns a method for load modulation, a wireless transceiver and a radio transmission device.

Abstract: One embodiment of the invention relates to a dynamically adjustable differential band-pass filter. This band-pass filter includes a first leg that has an input portion and an output portion with a first inductor therebetween. It also includes a second leg in parallel with the first leg, where the second leg has an input portion and an output portion with a second inductor therebetween. The first inductor is symmetrically inter-woven with the second inductor. In some embodiments, the band pass filter is configured to compensate for losses due to the inductors. Other band-pass filters and methods are also disclosed.

Abstract: According to one exemplary embodiment, a switching module includes a first harmonic phase tuning filter coupled to a first input of an RF switch. The first harmonic phase tuning filter is configured to provide an output impedance that substantially matches an input impedance of the RF switch at approximately a fundamental frequency and to provide a low impedance at approximately a harmonic frequency generated by the RF switch. The first harmonic phase tuning filter includes an LC circuit coupled between an output terminal of the first harmonic phase tuning filter and a ground and tuned to provide the low impedance at approximately the harmonic frequency generated by the RF switch. The RF switching module further includes a second harmonic phase tuning filter coupled to a second input of the RF switch. The first and second harmonic phase tuning filters can be fabricated on a single semiconductor die.

Abstract: Provided is a RF switch for switching a path of a RF signal using a semiconductor transistor such as a field effect transistor (FET). The RF switch includes a plurality of resonators connected to a RF transmission line, and at least one of switching elements connected in shunt or in series between the plural of resonators. The plurality of resonators resonate by interacting with the switching elements when the switching elements are shorted or open.