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| Number | Title | Issue Date |
| 8183959 | Variable capacitance circuit The invention relates to a variable capacitance circuit which achieves reduction in both of distortion and current consumption and furthermore achieves requirements of high power handling capability, cost reduction, and downsizing of the circuit. The variable capaci... | 05/22/2012 |
| 8134425 | Method and system for filters embedded in an integrated circuit package Methods and systems for filters embedded in an integrated circuit package are disclosed and may include controlling filtering of signals within an integrated circuit via one or more filter components embedded within a multi-layer package bonded to the integrated cir... | 03/13/2012 |
| 8072297 | Apparatus and method for improving channel filter selectivity and performance using voltage variable impedance elements A controllable filter arrangement with a voltage controlled device that subjects a signal to a predetermined impedance as part of the filtering process when the voltage controlled device is in an active state. In an inactive state, the voltage controlled device may ... | 12/06/2011 |
| 8054144 | Mode switching RC network Various embodiments include apparatus, systems, and methods having a conductive contact configured to couple to a resistor-capacitor (RC) network, a device unit coupled to the conductive contact, and a mode switching unit to change a characteristic of a signal at th... | 11/08/2011 |
| 8022789 | Tuning control arrangement A tuning arrangement for a resonant circuit, the tuning arrangement having an output reactance dependent upon a plurality of input applied signals one of which is an input tuning signal, and including: an array of tuning circuits connected in a network whose output ... | 09/20/2011 |
| 7911294 | Variable-frequency band-elimination filter A series resonance circuit defined by a series circuit including an inductor and a capacitor and a series resonance circuit defined by a series circuit including an inductor and a capacitor are connected in shunt to a signal line. A diode is disposed between the gro... | 03/22/2011 |
| 7889026 | Electronically variable inductor, associated tunable filter and methods The electrically tunable inductive device includes an electromagnet including an electromagnet core and a bias or tuning coil cooperating therewith to define opposing magnetic poles for generating a quiescent magnetic field that may be varied. An inductor is tunable... | 02/15/2011 |
| 7812690 | Compact power-agile filter, particularly for radiocommunication system amplification module The invention relates to a compact power-agile filter. The filter is a capacitance-weight filter comprising two electromagnetically-coupled oscillating circuits. Each oscillating circuit comprises capacitance weights. Each capacitance weight is controlled by signals... | 10/12/2010 |
| 7589604 | Selectable notch filter According to one exemplary embodiment, a selectable notch filter includes a transmission line, a bias circuit, and a switch for selectably coupling the transmission line to ground. In one embodiment, the switch is a PIN diode. The selectable notch filter can selecta... | 09/15/2009 |
| 7548136 | Distortion reduction for variable capacitance devices The present invention reduces distortion in variable capacitance devices by connecting a circuit to the variable capacitance devices that has low impedance at predetermined frequencies to suppress those frequencies and also suppress harmonics and mixing products res... | 06/16/2009 |
| 7443267 | Low-pass filter and low-pass filter array A low-pass filter comprises a capacitor, first and second varistors, a resistor, and first to third external electrodes. The capacitor includes a dielectric body and first to third internal electrodes. The first internal electrode is connected to the third external ... | 10/28/2008 |
| 7400868 | Automatic tuning apparatus for filter and communication instrument An automatic tuning apparatus for a filter includes a mode wherein a switching part is controlled so that a reference signal is inputted to the filter, a plural number of control signals are successively input to a control terminal of the filter, a tentative value o... | 07/15/2008 |
| 7369394 | Variable capacitor, circuit module, and communications apparatus A variable capacitor includes a supporting substrate and a plurality of variable capacitance elements, and bias lines. The plurality of variable capacitance elements is formed on the supporting substrate, each of which is composed of a lower-laid first electrode lay... | 05/06/2008 |
| RE40292 | Bandpass filter The bandpass filter has a comparatively large pass bandwidth, with, at the same time, comparatively steep edges up to the stop band and low attenuation in the passband. The bandpass filter contains three parallel LC elements, one of which is connected between the ba... | 05/06/2008 |
| 7369010 | Laser trimming to tune the resonance frequency of a spiral resonator, the characteristics of a high temperature superconductor filter comprised of spiral resonators, or the resonance of a planar coil This invention provides a laser trimming method for tuning the frequency of a spiral resonator, and for improving the characteristics of a high temperature superconductor filter comprised of high temperature superconductor spiral resonators, by tuning the individual... | 05/06/2008 |
| 7358834 | Transmission line voltage controlled nonlinear signal processors Waveguide nonlinear signal processors include transmission lines defined on a substrate. A plurality of varactors or pairs of varactors are situated along the transmission line and are in communication with a signal conductor of the transmission line and one or more... | 04/15/2008 |
| 7352261 | Production method for chip-form film-forming component A description is given of a high frequency filter comprising microstrips. The filter comprises at least two resonators (16, 18) which each have, as frequency-determining elements, a first straight microstrip section (28) and a second straight microstri... | 04/01/2008 |
| 7348871 | Inductance variable device A inductance variable device includes a first inductor, a second inductor magnetically coupled to the first inductor, a current source whose current is variable, electrically connected to the first inductor, and a current control unit. The current control unit contr... | 03/25/2008 |
| 7343137 | Circuit, switching module comprising the same, and use of said switching module The invention relates to a circuit comprising an antenna input (1), a signal input (2) and a signal output (3), and a switching unit (4), wherein the antenna input (1) is connected to a first protection device (6) against el... | 03/11/2008 |
| 7339446 | Tunable resonator with MEMS element According to an embodiment of the present invention, a microelectromechanical system (MEMS) element tunes a resonator to a frequency. ... | 03/04/2008 |
| 7327210 | Band agile filter A microwave filter and method for remotely tuning a microwave filter from one sub-band to another sub-band using metallic rings to adjust the capacitance or inductance of the resonator. In adjusting the capacitance, a plurality of metallic rings are disposed in the ... | 02/05/2008 |
| 7323955 | Narrow-band absorptive bandstop filter with multiple signal paths An absorptive bandstop filter includes at least two frequency-dependent networks, one of which constitutes a bandpass filter, that form at least two forward signal paths between an input port and an output port and whose transmission magnitude and phase characterist... | 01/29/2008 |
| 7321588 | Serial control of radio frequency integrated circuits A serial controller for use in controlling various radio frequency (RF) modules within an RF integrated circuit is disclosed. The serial controller is coupled to an serial bus that internal to the RFIC that transmits commands and data from a microcontroller to a dat... | 01/22/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7319599 | Module incorporating a capacitor, method for manufacturing the same, and capacitor used therefor A module incorporating a capacitor, the module including a circuit board and a layer incorporating a capacitor, wherein the circuit board includes a wiring layer and a via contact for providing electrical conductivity to a cathode and an anode of the capacitor. The ... | 01/15/2008 |
| 7319850 | Low noise block downconverter converting received signal to intermediate frequency signal In a low noise block downconverter converting a right-hand (or horizontally) polarized wave signal and a left-hand (or vertically) polarized wave signal to intermediate frequency signals, one of two filters for removal of interference waves from the intermediate fre... | 01/15/2008 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7274737 | EHF equalizer implemented with MEMs tap weight controls A signal equalizer that employs micro-electromechanical machine devices for the tap weight controllers. The equalizer includes a substrate on which is formed a forward transmission line rail and a return transmission line rail. A cantilever stanchion is also formed ... | 09/25/2007 |
| 7274919 | Radiofrequency transmitter and/or receiver The invention provides a simple solution for a broadband transmitter/receiver for which the working bandwidth is split into at least two non-contiguous sub-bands. The invention uses a filtering means 50 which comprises at least two band-pass filters 51... | 09/25/2007 |
| 7272367 | Multiband filter circuit and high-frequency transmitter The input side and the output side of a first bandpass filter circuit BPF1a are magnetically coupled to each other in a jump-coupling manner by the first mutual inductance (L31a, L41a) for connection between an input port IN... | 09/18/2007 |
| 7259417 | Direct digitally tunable microwave oscillators and filters A tunable element in the microwave frequency range is described that may include one or more tunable elements that are directly digitally controlled by a digital bus connecting a digital control circuit to each controlled element. In particular, each digital signal ... | 08/21/2007 |
| 7259639 | Inductor topologies and decoupling structures for filters used in broadband applications, and design methodology thereof Inductor topologies for filters used in broadband applications are described. In one implementation, an apparatus, such as an interface module includes a printed circuit board and a filter. The filter includes a generally circular high Quality factor (Q) value spira... | 08/21/2007 |
| 7259643 | Tunable wideband bandpass filter, tunable multi-band bandpass filter using the same, and methods therefore A tunable wideband bandpass filter that can digitally vary the center frequency and bandwidth of a signal to be filtered, and includes a plurality of switched-capacitor banks for varying capacitance and converting the center frequency and bandwidth into a digital si... | 08/21/2007 |
| 7248103 | Complex band-pass filter A complex band-pass filter. The complex band-pass filter includes a band-pass filter coupled to a voltage source. The band-pass filter includes a first plurality of transconductors that receives a first voltage, where the first voltage controls the center frequency ... | 07/24/2007 |
| 7230503 | Imbalanced differential circuit control A differential circuit includes first and second side circuits which are coupled to receive control signals in such a way as to introduce an intentional imbalance in the differential circuit for certain benefits discussed herein. An exemplary pseudo-differential LC ... | 06/12/2007 |
| 7227431 | Variable matching circuit, variable resonance circuit, variable phase-shifting circuit and variable attenuation circuit each having variable-capacitance capacitor In a variable matching circuit including an impedance device and a variable-capacitance capacitor, the variable-capacitance capacitor is formed in a manner that a plurality of variable-capacitance devices using thin film dielectric layers whose dielectric constants ... | 06/05/2007 |
| 7202768 | Tunable inductor In general, the invention is directed to a tunable inductor that makes use of eddy current effect to tune the inductance of an inductor. The tunable inductor may include a spiral or helical inductor in proximity to one or more sets of eddy current coils. Each eddy c... | 04/10/2007 |
| 7193799 | Apparatus and method of removing resonance frequency in system An apparatus and a method to remove a resonance frequency of a system in which an unnecessary resonance frequency occurs in a head stack assembly (HSA) having a head for reading/writing data. The HSA is identified and filtered to prevent mechanical damage caused by ... | 03/20/2007 |
| 7183880 | Discrete inductor bank and LC filter A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A control signal selects a band of frequencies for processing. A first ... | 02/27/2007 |
