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| Number | Title | Issue Date |
| 8130053 | Tank tuning for band pass filter used in radio communications A tuning method and circuit for an LC tank resonant circuit, including an inductor and a variable capacitor, are described. In a tuning mode, an RF input signal is applied to an input port of the circuit, and the RF output signal is monitored as a variable capacitor... | 03/06/2012 |
| 8076991 | Frequency hopping band-stop filter A digitally-tunable filter includes a tunable filter circuit (110) for generating an output signal by processing an input signal based at least on a plurality of filter control signals (114). The filter also includes an input power sampler (118)... | 12/13/2011 |
| 8067996 | Vanadium-dioxide front-end advanced shutter technology A vanadium dioxide front-end advanced shutter device. The electronic shutter device is designed to protect receiver front-ends and other sensitive circuits from HPM pulse events such as HPM weapons, directed energy weapons, or EMPs. The shutter incorporates a transi... | 11/29/2011 |
| 7990229 | Methods and devices for compensating a signal using resonators Compensation of a signal using resonators as well as related methods and devices are described. Some embodiments include methods and devices for performing frequency compensation on a signal. ... | 08/02/2011 |
| 7825743 | Systems and methods for tuning filters Methods, systems and apparatus for filter design, analysis and adjustment are provided. Various embodiments may include, for example, methods, systems and apparatus for electric signal filter tuning. Embodiments may also include design techniques for planar electric... | 11/02/2010 |
| 7812685 | Automatic regulator of filter A second operational amplifier (7) is arranged, as an interface circuit (6), between a first operational amplifier (5) outputting the control voltage (Vcd) of a dummy filter (2) and a main filter (1), and the reference voltage (Vr)... | 10/12/2010 |
| 7750752 | Programmable SAW filter module Programmable SAW filter module are provided to overcome undesirable drawbacks, limitations and shortcomings associated with “in-line” SAW filters, such as insertion loss, propagation loss and strong signal capture effects. The programmable SAW filter modules rem... | 07/06/2010 |
| 7659793 | Antenna device including a high frequency circuit, a reactance circuit and first and second ground sections An antenna device includes an antenna element, a high-frequency circuit connected to the antenna element, a first ground section connected to the high-frequency circuit, a reactance circuit connected to the first ground section, and a second ground section connected... | 02/09/2010 |
| 7586383 | Automatic tuning of multicavity filters of microwave signals The system for the automatically tuning of multicavity filters of high frequency signals, by means of screws sticking out from the lid of the plate incorporating said cavities, comprises a robotized movement imparting subsystem SUB-1A, a measuring subsystem S... | 09/08/2009 |
| 7515012 | System and method for automatic tuning of a magnetic field generator An automatic tuning system for a magnetic field generating tuned circuit includes a processor configured to maintain the resonant frequency of a tuned circuit equal to a reference frequency. The tuned circuit is driven by a power amplifier whose output provides an a... | 04/07/2009 |
| 7482890 | Automated systems and methods for tuning filters by using a tuning recipe Methods, systems and apparatus for filter design, analysis and adjustment are provided. Various embodiments may include, for example, methods, systems and apparatus for electric signal filter tuning. Embodiments may also include design techniques for planar electric... | 01/27/2009 |
| 7439826 | Programmable surface acoustic wave filter A programmable surface acoustic wave filter and methods thereof including a piezoelectric substrate, a ground electrode formed in a comb structure on the piezoelectric substrate, a plurality of output electrodes formed in comb structures on the piezoelectric substra... | 10/21/2008 |
| 7424053 | Channel equalization in data receivers Channel equalization in a 1000BASE-T receiver is performed by a fixed mode analog filter 2 suitable for the longest possible cable length, by a FFE (3), and by a digital filter 4. The digital filter (4) has two sets of taps. One set is op... | 09/09/2008 |
| 7408417 | Filter automatic adjustment apparatus, filter automatic adjustment method, and mobile telephone system The invention provides a filter automatic adjustment apparatus and method, and a mobile telephone system, which realizes low power consumption while adjusting a characteristic frequency of a main filter having an adjustment function to a target frequency. The filter... | 08/05/2008 |
| 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 |
| 7400212 | Self-tuned active bandpass filters An automatically tuned on-chip active continuous-time real bandpass filter operates on a differential signal while simultaneously being tuned using a common-mode (CM) reference signal, which results in a superior accuracy of its center frequency and bandwidth. The f... | 07/15/2008 |
| 7369828 | Electronically tunable quad-band antennas for handset applications An electronically tunable quad-band antenna which includes a tunable high band antenna tuned by at least one tunable varactor associated therewith; the tunable high band antenna further includes a substrate, a patch element on said substrate, at least one voltage tu... | 05/06/2008 |
| 7363648 | Cable modem tuner An IF input signal corresponding to a selected reception channel is applied through an SAW filter to an IF-AGC circuit, the amplitude of the signal is adjusted to a prescribed level, and the signal is thereafter supplied to a down converter unit. The down converter ... | 04/22/2008 |
| 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 |
| 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 |
| 7336939 | Integrated tracking filters for direct conversion and low-IF single conversion broadband filters A radio frequency (RF) tuner includes a programmable tracking filter bank receiving an RF input and outputting a filtered RF signal. A mixer stage receives the filtered RF signal and outputs a first quadrature component of the filtered RF signal and a second quadrat... | 02/26/2008 |
| 7317364 | Varactor tuning for a narrow band filter including an automatically controlled tuning system A method and apparatus for providing dynamic and remote tuning of a cryo-cooled bandpass filter is disclosed. The device includes resonator element and a voltage sensitive element as part of the capacitance in a narrow band filter circuit. A varactor such as a GaAs ... | 01/08/2008 |
| 7304530 | Utilization of device types having different threshold voltages A technique implements high impedance nodes using high threshold voltage devices that may generate less leakage current and may have a higher gate oxide breakdown voltage than standard devices in a particular manufacturing technology. Under at least one operating co... | 12/04/2007 |
| 7276990 | Single-pole multi-throw switch having low parasitic reactance, and an antenna incorporating the same A switch arrangement comprises a plurality of MEMS switches arranged on a substrate about, and close to, a central point, each MEMS switch being disposed on a common imaginary circle centered on the central point. Additionally, and each MEMS switch is preferably spa... | 10/02/2007 |
| 7268644 | Antenna connection device, antenna signal splitter and method for reception frequency control A system for connecting at least two receivers to a common antenna is proposed, antenna signal lines being supplied to the receivers, which stands out in that the input impedances of the at least two receivers are matched only in a narrow-band fashion in the range o... | 09/11/2007 |
| 7268643 | Apparatus, system and method capable of radio frequency switching using tunable dielectric capacitors An embodiment of the present invention provides an apparatus, comprising a radio frequency switch capable of using tunable dielectric capacitors as the switching element. The apparatus may further comprise a cross connector connecting a plurality of ports and wherei... | 09/11/2007 |
| 7266464 | Dynamic cut-off frequency varying filter A method and apparatus are disclosed. The apparatus includes a store of at least one historical sensor measurement, a store of potential cut-off frequencies, and a filter. Each potential cut-off frequency is associated with a respective potential difference between ... | 09/04/2007 |
| 7260211 | Method and circuit for adapting the impedance of an analog telecommunication connection The invention relates to a method and a circuit for adapting the impedance in a telecommunication connection comprising a speech path and a data path having modems. Conductive properties measured by the modems are used to precisely adjust the impedance on the speech... | 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 |
| 7257178 | Base band circuit of receiver and low cut-off frequency control method A base band circuit of a receiver and a low cut-off frequency control means can quickly converge transition state due to gain fluctuation with setting a low cut-off frequency of a high-pass filter as low as possible. The base band circuit of a receiver has a variabl... | 08/14/2007 |
| 7253699 | RF MEMS switch with integrated impedance matching structure An impedance matching structure for a RF MEMS switch having at least one closeable RF contact in an RF line, the impedance matching structure comprising a protuberance in the RF line immediately adjacent the RF contact that forms one element of a capacitor, the othe... | 08/07/2007 |
| 7251466 | Television receiver including an integrated band selection filter A tuner circuit includes a band selection filter coupled to receive an input RF signal and provide a band selected output signal where the band selection filter includes a bank of band pass filters. Each band pass filter includes an inductor and a variable capacitor... | 07/31/2007 |
| 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 |
| 7245269 | Adaptive beam forming antenna system using a tunable impedance surface A method of and apparatus for beam steering. A feed horn is arranged so that the feed horn illuminates a tunable impedance surface comprising a plurality of individually tunable resonator cells, each resonator element having a reactance tunable by a tuning element a... | 07/17/2007 |
| 7242195 | Integral spark detector in fitting which supports igniter in gas turbine engine A system for detecting spark in an igniter for a gas turbine engine. An igniter generates a plasma, or spark, somewhat similar to an automotive spark plug. In the invention, an inductive pick-up is positioned adjacent the igniter, to detect current pulses in the ign... | 07/10/2007 |
| 7242917 | Apparatus and method for antenna attachment An apparatus and method of for attaching an antenna to a mobile communication device. The apparatus can include radio frequency generation circuitry, a radio frequency feed point coupled to the radio frequency generation circuitry, a direct current voltage source co... | 07/10/2007 |
| 7212047 | Semiconductor integrated circuit having built-in PLL circuit A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits ... | 05/01/2007 |
| 7209866 | Method and arrangement for automatic adjustment of devices having setting elements, and a corresponding computer program product and a corresponding computer-readable storage medium Devices having setting elements are adjusted by carrying out a first measurement of a characteristic curve to be controlled at predefined measurement points, each setting element assuming a reference setting; testing a termination condition and terminating the metho... | 04/24/2007 |
| 7197800 | Method of making a high impedance surface A high impedance surface and a method of making same. The surface includes a molded structure having a repeating pattern of holes therein and a repeating pattern of sidewall surfaces, the holes penetrating the structure between first and second major surfaces thereo... | 04/03/2007 |
| 7190213 | Digital time constant tracking technique and apparatus Methods and apparatus are provided for tuning out time constant deviations of a network (414) due to process, voltage, and temperature variations. The apparatus (400) comprises a clock reference (404) from which a digital time constant is correl... | 03/13/2007 |
