Abstract: A filter circuit (1) includes a first transmission line (11), a second transmission line (12) which has an electrical length set to ½ of an electrical length of the first transmission line, a first capacitor (21), a second capacitor (22), and a third capacitor (23). Capacitances of the first capacitor, the second capacitor, and the third capacitor are set in such a manner that a circuit including the first transmission line, the second transmission line, and the first capacitor resonates in series at a predetermined fundamental frequency, a circuit including the first transmission line, the first capacitor, and the second capacitor resonates in parallel at a third harmonic frequency being a tripled frequency of the fundamental frequency, and a circuit including the second transmission line and the third capacitor resonates in series at the third harmonic frequency.

Abstract: A dot product multiplier for matrix operations for an A matrix of order 1×m with a coefficient B matrix of order m×m. Processing Elements (PEs) are arranged in an m×m array, the columns of the array summed to provide a dot product result. Each of the PEs contains a sign determiner and a plurality of analog multiplier cells, one multiplier cell for each value bit. The multipliers operate over four clock cycles, initializing a capacitor charge according to sign on a first clock phase, sharing charge on a second phase, canceling charge on a third phase, and outputting the resultant charge on a fourth phase, the resultant charge on each column representing the dot product for that column.

Abstract: Embodiments of a circuit, system, and method are disclosed. In an embodiment, a circuit includes first and second microstrip transmission lines. The first and second microstrip transmission lines include linearly arranged conductive strips on the circuit and a slotline formation extends between the first microstrip transmission line and the second microstrip transmission line so that the slotline formation is configured to electromagnetically couple the first microstrip transmission line to the second microstrip transmission line during operation of the circuit. In addition, the circuit includes at least one controllable capacitance circuit electrically connected to at least one of the first microstrip transmission line and the second microstrip transmission line, where a magnitude of a capacitance value of the at least one controllable capacitance circuit (e.g., including a barium strontium titanate (BST) capacitor) is controllable (e.g.

Abstract: An embodiment of the disclosure provides a tunable radio frequency (RF) circuit, a control method, and an electronic device including the same. An electronic device according to an embodiment of the disclosure may include an antenna, a transceiver, a tunable radio frequency (RF), and at least one processor operatively coupled with the transceiver and the tunable RF circuit. The tunable RF circuit may further include a switch, a low noise amplifier (LNA), a power amplifier (PA), a fixed filter configured to pass signals in a first frequency band, and attenuate signals in a second frequency band at least one tunable filter configured to pass signals in at least a portion of the second frequency band, where the portion of the second frequency band is tunable, and at least one detector configured to detect a signal strength passing through the at least one tunable filter.

Abstract: A coupled resonator filter is disclosed. The coupled resonator filter is provided with high quality factor, and comprises: a first resonance unit, a second resonance unit and a main adjustment unit. In the present invention, the main adjustment unit is electrically connected between the first resonance unit and the second resonance unit, and comprises an adjustable capacitor. By changing a capacitance of the adjustable capacitor, a coupling coefficient between the first resonance unit and the second resonance unit is adjusted. As a result, the coupled resonator filter of the present invention included advantages of high controllability of the frequency bandwidth and high inhibition rate of noise signal.

Abstract: Systems, devices, and methods for adjusting tuning settings of tunable components, such as tunable capacitors, can be configured for calibrating a tunable component. Specifically, the systems, devices and methods can measure a device response for one or more inputs to a tunable component, store a calibration code in a non-volatile memory that characterizes the device response of the tunable component, and adjust a tuning setting of the tunable component based on the calibration code to achieve a desired response of the tunable component.

Abstract: Systems, devices, and methods for tunable filters that are configured to support multiple frequency bands, such as within the field of cellular radio communication, can include a first resonator and a second resonator configured to block signals within one or more frequency ranges, and one or more coupling element connected to both the first resonator and the second resonator. The one or more coupling element can be configured to provide low insertion loss within a pass band.

Abstract: A filter includes a first resonant circuit having one or more first resonant frequencies, a second resonant circuit having one or more second resonant frequencies different from the first resonant frequency, and a switch connected to the first resonant circuit and the second resonant circuit. The switch switches between a first state in which a radio-frequency signal of the first resonant frequency flows from an IN terminal to an OUT terminal via the first resonant circuit and a radio-frequency signal of the second resonant frequency flows from the IN terminal to ground via the second resonant circuit and a second state in which a radio-frequency signal of the first resonant frequency flows from the IN terminal to ground via the first resonant circuit and a radio-frequency signal of the second resonant frequency flows from the IN terminal to the OUT terminal via the second resonant circuit.

Abstract: A switching regulator configured to generate an output voltage based on an input voltage is provided. The switching regulator includes: an inductor; and a capacitor circuit configured to generate the output voltage by charging an inductor current passing through the inductor from the input voltage, provide a first capacitance as a load capacitance based on the output voltage being a first level or a second level, and provide a second capacitance, which is less than the first capacitance, as the load capacitance based on the output voltage being between the first level to the second level.

Abstract: A low-pass filter having a notch frequency due to a resonance between a mutual inductance of inductive elements and a capacitance. An exemplary low-pass filter generally includes a first inductive element having a first terminal and a second terminal, the first terminal being coupled to the input port, and a second inductive element having a first terminal and a second terminal, the first terminal of the second inductive element being coupled to the second terminal of the first inductive element and the second terminal of the second inductive element being coupled to the output port. The filter also includes a shunt capacitive element coupled to the second terminal of the first inductive element, wherein a mutual inductance between the first inductive element and the second inductive element and a capacitance of the shunt capacitive element are configured to have a resonance providing a notch frequency for the low-pass filter.

Abstract: Techniques are described for staggered-bias varactors. For example, a staggered-bias varactor can include a control voltage node, a number of bias voltage nodes, and a number of sub-varactors coupled in parallel. The control voltage node can be configured to receive a single, variable control voltage; and the bias voltage nodes can each be configured to receive a different, fixed bias voltage. Each sub-varactor is configured, so that its equivalent capacitance is a function of a difference between the control voltage and a respective one of the bias voltages; and the equivalent capacitance of the staggered-bias varactor is a function of the capacitances of the component sub-varactors. The number of varactors and the bias voltages can be configured, so that respective non-linear capacitive responses of the component sub-varactors effectively combine to yield a substantially linear capacitive response for the staggered-bias varactor as a whole.

Abstract: A semiconductor device including a transistor includes a pixel circuit, a monitor circuit, and a correction circuit. The pixel circuit includes a selection transistor, a driving transistor, and a light-emitting element. The monitor circuit includes a monitor light-emitting element and a monitor transistor. The semiconductor device obtains the value of current flowing to the monitor light-emitting element and the monitor transistor and controls the value of current flowing to the light-emitting element and the driving transistor by the correction circuit.

Abstract: An RF feedthrough has an electrically insulative cone that is hollow having first and second openings at first and second ends having first and second diameters. The first diameter is larger than the second diameter, defining a tapered sidewall of the cone to an inflection point. A stem is coupled to the second end of the cone, and passes through the first opening and second opening. A flange is coupled to the first end of the cone and has a flange opening having a third diameter. The third diameter is smaller than the first diameter. The stem passes through the flange opening without contacting the flange. The flange couples the cone to a chamber wall hole. Contact portions of the cone may be metallized. The cone and flange pass the stem through the hole while electrically insulating the stem from the wall of the chamber.

Abstract: The invention specifies a tunable RF filter which may operate using electroacoustic components and provides good electrical properties despite having a wide tuning range. For this purpose, the RF filter comprises a tunable filter core (AFK) having electroacoustic (EAK) and detunable (AKE) filter elements, and impedance restoration circuits (IWS1, IWS2) for compensating for an impedance change by tuning the filter core.

Abstract: Systems, devices, and methods for tunable filters that are configured to support multiple frequency bands, such as within the field of cellular radio communication, can include a first resonator and a second resonator configured to block signals within one or more frequency ranges, and one or more coupling element connected to both the first resonator and the second resonator. The one or more coupling element can be configured to provide low insertion loss within a pass band.

Abstract: A first series arm LC filter circuit includes a capacitor and an inductor connected in series to provide a series circuit between a first connection terminal and a second connection terminal, a capacitor connected in parallel to the series circuit, and an inductor and a variable capacitor connected in parallel between a connection point of the capacitor and the inductor and a ground potential. A first parallel arm LC filter circuit is connected between the first connection terminal and the ground potential. A second parallel arm LC filter circuit is connected between the second connection terminal and the ground potential. The inductor is directly connected to the second connection terminal or is connected to the second connection terminal with another inductor interposed therebetween.

Abstract: Reflectionless low-pass, high-pass, band-pass, band-stop, all-pass, all-stop, and multi-band filters, as well as a method for designing such filters is disclosed, along with a method of enhancing the performance of such filters through the use of unmatched sub-networks to realize an optimal frequency response, such as the Chebyshev equal-ripple response. These filters preferably function by absorbing the stop-band portion of the spectrum rather than reflecting it back to the source, which has significant advantages in many different applications. The unmatched sub-networks preferably offer additional degrees of freedom by which element values can be assigned to realize improved cutoff sharpness, stop-band rejection, or other measures of performance.

Abstract: Provided is a capacitively coupled plasma processing apparatus which improves a controllability of the RF bias function and reliably prevents unwanted resonance from being generated on a RF transmission line between a counter electrode and ground potential to enhance reliability of the plasma process. In the capacitive coupled type plasma processing apparatus, three kinds of RF powers from a first, second and third RF power supplies (35, 36, 38) are superimposed and applied to susceptor (lower electrode) (16). In such a three-frequency superimposing and applying application scheme, the frequency-impedance characteristic around upper electrode (48) is considered to prevent a serial resonance from occurring on an RF transmission line around upper electrode (48) in consideration of all the low order frequencies of the IMD relevant to and affecting the plasma process.

Abstract: An acoustic wave device includes: a support substrate; a first piezoelectric substrate bonded to a first principal surface of the support substrate, the first piezoelectric substrate being a single crystal substrate, a first acoustic wave resonator located on an opposite surface of the first piezoelectric substrate from a surface to which the support substrate is bonded, the first acoustic wave resonator including an IDT; a second piezoelectric substrate bonded to a second principal surface of the support substrate opposite from the first principal surface, the second piezoelectric substrate being a single crystal substrate; and a second acoustic wave resonator located on an opposite surface of the second piezoelectric substrate from a surface to which the support substrate is bonded, the second acoustic wave resonator including an IDT.

Abstract: A tunable RF filter circuit (AHF) is specified which enables good electrical properties, good tunability and simple driving despite low complexity. In this case, the filter circuit comprises a first and a second signal route (SW1, SW2) in a signal path (E, A). At least three resonant circuits (RK1, RK2, RK3) are arranged one after another in the second signal route and interconnect the second signal route with ground. The resonant circuits are electrically and/or magnetically coupled (K) and each comprise a tunable impedance element. The second signal route contains an impedance element (IMP).

Abstract: A high-frequency filter (10) includes a first input-output terminal (P1), a second input-output terminal (P2), a variable frequency filter (20), and a fixed frequency filter (30). The variable frequency filter (20) and the fixed frequency filter (30) are connected in series and coupled between the first input-output terminal (P1) and the second input-output terminal (P2). The variable frequency filter (20) is a filter capable of varying a passband and an attenuation band. The fixed frequency filter (30) is a filter having a fixed passband and a fixed attenuation band. The passband of the fixed frequency filter (30) is set so as to be at least partially overlapped with multiple passbands realized by the fixed frequency filter (30).

Abstract: A variable filter circuit (10) includes a parallel arm (11) connected between a port (P3) and node (A), a series arm (12) including a resonator (Re_s1) connected in series between a port (P1) and node (A), and a series arm (13) including a resonator (Re_s2) connected in series between a port (P2) and node (A). The parallel arm (11) includes a first inductor (Lp1). The series arms (12, 13) include variable capacitors (Cp_s1, Cp_s2) connected in parallel to the resonators (Re_s1, Re_s2).

Abstract: A high pass filter includes a first LC series resonator including a first end connected to a signal path, and a second end connected to at least one ground terminal, a second LC series resonator including a third end electrically connected to the signal path, and a fourth end connected to the at least one ground terminal, and a third capacitor between a first portion extending from a first capacitor to a first inductor and a second portion extending from a second capacitor to a second inductor.

Abstract: A wiring board with a filter circuit includes an insulating base, a conductor pattern, and a filter circuit. The conductor pattern is provided on the insulating base and defines the filter circuit. The insulating base includes an intermediate member, and first through third end members connected to the intermediate member. A first external connection terminal is provided on the first end member, and is disposed on a first end of the conductor pattern in the signal transmission direction. A second external connection terminal is provided on the second end member, and is disposed on a second end of the conductor pattern in the signal transmission direction. A first ground connection terminal that grounds the filter circuit is provided on the intermediate member. A second ground connection terminal that grounds the filter circuit is provided on the third end member.

Abstract: A communication device comprises a set of filters that are selectively coupled to different groups of front end ports and an antenna port to form a diplexer, a single filter or a no filter connection for transmission and reception of different data signals. A processor operates to selectively determine or combine filters and couple them to the front end ports and the antenna port based on an operational mode and a frequency separation of signals operating in different frequency ranges of different operating bands. The operational mode can alter between a carrier aggregation mode, in which more than one operating band is aggregated during transmission or reception, and a non-carrier aggregation mode, in which only one filter, no filters or the diplexer is bypassed. The insertion loss of the transmissions and receptions can also be actively decreased.

Abstract: A method includes forming a replica circuit above a surface of a glass-type material. The replica circuit includes a thin-film transistor (TFT) configured to function as a variable capacitor or a variable resistor. The method further includes forming a transformer above the surface of the glass-type material. The transformer is coupled to the replica circuit, and the transformer is configured to facilitate an impedance match between the replica circuit and an antenna.

Abstract: Systems and method are provided for a switching circuit that enables attenuation of high power signals in relatively small band(s) without attenuating information in other bands. Embodiments of the present disclosure provide switching circuits with intrinsically switched filters that enable channelized limiting without affecting adjacent channels. Further, embodiments of the present disclosure provide a unique filter coupling topology that enables filters to be switched on or off without changing the input impedance of the filters.

Abstract: A dental scaler apparatus includes a low power transformer that is timed to the operating frequency of a detachable scaler insert connected to the handle of the scaler apparatus by selectively connecting corresponding banks of parallel adjustment capacitors by engaging corresponding switches coupled to each of the adjustment capacitors.

Abstract: Illustrative embodiments of reconfigurable microwave filters, as well as associated systems and methods, are disclosed. In at least one illustrative embodiment, a reconfigurable microwave filter may comprise a plurality of cavity resonators on a common substrate and a plurality of control circuits each configured to control a resonant frequency of one of the plurality of cavity resonators. The reconfigurable microwave filter may also comprise a plurality of feedback circuits each configured to generate a feedback signal that is indicative of the resonant frequency of one of the plurality of cavity resonators and to transmit the feedback signal to one of the plurality of control circuits.

Abstract: A front-end circuit with a tunable filter is disclosed. In an embodiment, the front end circuit includes a first signal path connected to an antenna connection, a first filter arranged in the first signal path, wherein the first filter is tunable within a first frequency range, and an extra signal path and a first fixed filter arranged therein, wherein the first fixed filter has a passband for an extra frequency band, wherein the first fixed filter is not tunable, and wherein the extra frequency band is arranged outside or inside the first frequency range. The front end circuit further includes a narrowband antenna tuner configured to be set to a respective tunable frequency range, wherein the narrowband antenna tuner is arranged between the first filter, the first fixed filter and the antenna connection in the first and second signal paths.

Abstract: A tunable filter is a ladder circuit tunable filter including serial arm resonators and a parallel arm resonator. The serial arm resonators and the parallel arm resonator include elastic wave resonators. Variable capacitors are connected in series to the serial arm resonators, a variable capacitor is connected in parallel to the parallel arm resonator, and first inductors are connected in series to the serial arm resonators. When an impedance at a resonant frequency of the serial arm resonators is Zrs and an impedance at a resonant frequency of the parallel arm resonator is Zrp, a ratio Zrs/Zrp is not greater than 1.

Abstract: The present subject matter relates to systems, devices, and methods for adaptively tuning antenna elements and/or associated filter elements to support multiple frequency bands. For example, a tunable filter having an input node and an output node can be selectively tunable to define one or more pass bands associated with one or more first signal bands and one or more reject bands associated with one or more second signal bands. The tunable filter can be configured to pass signals having frequencies within the first signal bands between the input node and the output node and to block signals having frequencies within the second signal bands. Furthermore, the tunable filter can be configured to selectively tune the pass bands to have a minimum pass band insertion loss at any of a variety of frequencies, including frequencies that are greater than and less than frequencies within the reject bands.

Abstract: Systems and methods are provided for tunable band pass filtering for Tunable RF Anti-Jamming Systems. A tunable notch filter includes a transmission line coupled to an antenna, a splitter, a band-stop filter, a polarity inverter, and a combiner. In operation, the band-stop filter suppresses predetermined frequency bands of a received signal creating a filtered signal, the polarity inverter creates an inverted signal, and the combiner combines the filtered and inverted signals to create a pass band including the predetermined frequency bands and suppressing frequency bands adjacent the predetermined frequency bands.

Abstract: A circuit substrate includes a substrate body, an input signal line conductor with which the substrate body is provided and included in an input path, a first mounting portion provided on a main surface of the substrate body, included in a first output path and on which a high-pass filter including a lumped-parameter element is mounted, at least one first output signal line conductor with which the substrate body is provided and included in the first output path, and a second mounting portion provided on the main surface of the substrate body, included in a second output path and on which a low-pass filter including a lumped-parameter element is mounted. The first output signal line conductor provided farthest upstream in a signal propagation direction is connected to the input signal line conductor via a first lumped-parameter element mounted on the main surface of the substrate body.

Abstract: A tunable impedance matching network comprising shunt (e.g. parallel) tunable capacitors and other fixed reactive elements is presented. The tunable impedance matching network can be used as one component of an SPTM (scalable periphery tunable matching) amplifier.

Abstract: Methods and system for using a multifunctional filter to minimize insertion loss in a multi-mode communications system are described. Specifically described is a multifunctional filter that is configurable to operate in a band-pass mode when a first type of signal is propagated through the multifunctional filter, and to operate in a low-pass mode when a second type of signal is propagated through the multifunctional filter. The multifunctional filter presents a lower insertion loss to the second type of signal when operating in the low-pass mode than in the band-pass mode.

Abstract: A communication device changes an applied voltage output from a voltage circuit, and allows a capacitance measuring device to measure the respective capacitance values of a variable capacitance element before and after a change in the applied voltage. The communication device calculates a voltage correction value for correcting an initial variation of the capacitance value of the variable capacitance element using the respective capacitance values of the variable capacitance element before and after the change in the applied voltage, and respective applied voltage values before and after the change, and a correction voltage for canceling the initial variation in the capacitance value of the variable capacitance element, and outputs the correction voltage from the voltage circuit.

Abstract: A radio frequency filter (1) comprises an input impedance adaption section (2) and a tank capacitor section (3). Thereby, the capacity of the input impedance adaption section (2) does not comprise a fixed capacitor, it only comprises switchable capacitors. Further, the tank capacitor section (3) does not comprise a fixed capacitor as well it only comprises switchable capacitors. The capacity of the input impedance adaption section (2) can be tuned independent of the tank capacity, section capacity by means of switchable capacitors. Hence, bandwidth and frequency of the radio frequency filter can be modified independent of each other. The imput impendance adaption section (2) is connected in series between the input and output of the filter (1). The tank capacitor section (3) is shunt connected between the input-output series path of the filter (1) and ground.

Abstract: A switchable band-pass filter is described that includes a first capacitor, a first switch circuit, and a second switching circuit arranged in parallel between a first node and a second node. The first switching circuit includes a third node and a first switch. The first switch is coupled between the third node and the second node. The second switching circuit includes a fourth node and a second switch. The second switch is coupled between the fourth node and the second node. A linking circuit is coupled between the third node. Methods for operating the switchable band-pass filter are also described.

Abstract: The invention relates to a wireless communication terminal able to transmit and/or receive video, audio or data signals in a first and a second frequency band comprising a first MIMO circuit of N paths (N?1) operating in the first frequency band and a second MIMO circuit of M paths (M?1) operating in the second frequency band, the first and second MIMO circuits each being coupled to front-end modules comprising respectively N and M power amplifiers, the front-end modules being connected to an antenna system.

Abstract: A cascaded arrangement of resonant tanks capable of widening frequency selection and tuning within an RF circuit is presented. Moreover, usage of DTC allows for larger frequency tuning per tank as well as handling of higher voltage swings while maintaining high linearity across the tuning range.

Abstract: A ceramic multilayer component has a base body with connecting contacts, fitted to it, with a ferrite ceramic, which is provided for an inductive area and in which an inductance is arranged which is formed by electrical conductors, and with a varistor ceramic, wherein the varistor ceramic comprises at most 40% of the volume of the base body.

Abstract: A wide range tunable capacitor bank is provided. The capacitor bank comprises a variable capacitor, the capacitance value of which is adjustable within a predetermined capacitance range defined by a minimum capacitance value and a maximum capacitance value. The capacitor bank further comprises one or more switched capacitors each electrically connected in circuit to the variable capacitor. The variable capacitor is configured to allow the capacitance value thereof to be adjusted within the predetermined capacitance range and the one or more switched capacitors are configured to be selectively actuated to permit continuous tuning of the capacitor bank over a second capacitance range that is greater than the predetermined capacitance range. Applications in which the capacitor bank may be implemented, and a method of fabricating an integrated system comprising a plurality of passive components, such as, for example, those of the capacitor bank and high quality factor inductors, are also provided.

Abstract: In one example embodiment, a programmable filter is provided, including a plurality of variable-inductance networks and a plurality of variable-capacitance networks. The programmable filter may be implemented in a classical filter topology, with variable-capacitance networks replacing discrete capacitors and variable-inductance networks replacing discrete inductors. An example variable-inductance network comprises a primary inductor with an intermediate tap, and secondary inductor connected at the intermediate tap, with switches for selecting an inductance.

Abstract: A method of constructing an RF filter comprises designing an RF filter that includes a plurality of resonant elements disposed, a plurality of non-resonant elements coupling the resonant elements together to form a stop band having a plurality of transmission zeroes corresponding to respective frequencies of the resonant elements, and a sub-band between the transmission zeroes. The non-resonant elements comprise a variable non-resonant element for selectively introducing a reflection zero within the stop band to create a pass band in the sub-band. The method further comprises changing the order in which the resonant elements are disposed along the signal transmission path to create a plurality of filter solutions, computing a performance parameter for each of the filter solutions, comparing the performance parameters to each other, selecting one of the filter solutions based on the comparison of the computed performance parameters, and constructing the RF filter using the selected filter solution.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, an adaptive impedance matching network having an RF matching network coupled to at least one RF input port and at least one RF output port and comprising one or more controllable variable reactive elements. The RF matching network can be adapted to reduce a level of reflected power transferred from said at least one input port by varying signals applied to said controllable variable reactive elements. The one or more controllable variable reactive elements can be coupled to a circuit adapted to map one or more control signals that are output from a controller to a signal range that is compatible with said one or more controllable variable reactive elements. Additional embodiments are disclosed.

Abstract: A high spectral purity swept local oscillator including a tracking filter. The output of a swept DDS oscillator may be improved by filtering it with a band-pass filter having an adjustable center frequency, which is adjusted in real time to track the instantaneous frequency of the DDS oscillator. The tracking may be accomplished by comparing, using a phase comparator, the phase at the output of the band-pass filter to the phase at its input, and feeding back to the frequency control input of the band-pass filter a signal corresponding to the phase difference measured by the phase comparator.

Abstract: A circuit includes a first finger capacitor having a first bus line coupled to a first plurality of finger elements and a second bus line coupled to a second plurality of finger elements. The first bus line is parallel to the second bus line. The circuit further includes an inductor having a first leg oriented perpendicular to the first bus line and the second bus line. The first leg of the inductor is coupled to a center of the first bus line.

Abstract: To provide a capacitive device capable of accurately securing a capacitance value, a variable capacitive device capable of sufficiently securing a capacity variability rate, and a resonance circuit that uses the capacitive devices. A capacitive device includes a capacitive device body constituted of a dielectric layer and at least a pair of capacitive device electrodes that sandwich the dielectric layer and cause a desired electric field in the dielectric layer; and stress adjustment portions to adjust a stress caused in the dielectric layer of the capacitive device body.

Abstract: Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.