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7598838 |
Variable inductor technique
An integrated variable inductor is achieved by placing a second closed-loop inductor immediately above or below a primary inductor. The closed-loop configuration of the second inductor may be...
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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...
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7586385 |
Method and apparatus for varying an impedance
A method and apparatus for dynamically varying the impedance of a tank circuit whereby, over time, the response of the circuit to a received signal is maximized.
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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...
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7511596 |
Dual bandpass filter having serial configuration of coupled-line filters
Two second-order bandpass filter are connected serially to obtain a dual bandpass filter. One is inductive and the other is capacitive. One has a low passband and the other has a high passband....
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7492240 |
Integrated capacitor and inductor
An integrated capacitor and inductor device for separate use as a capacitor and inductor. The device has a four-terminal arrangement having separate capacitor and inductor terminals, which allows...
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7446631 |
Radio frequency inductive-capacitive filter circuit topology
A filter circuit topology for filtering a radio frequency input signal includes one or more inductor devices, such as, for example, discrete chip or air coils. The inductor devices are center...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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7145415 |
Electrically tunable filters with dielectric varactors
This invention provides a voltage tunable filter comprising an input connection point, an output connection point, and at least one circuit branch electrically coupled to the input connection point...
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7117025 |
Varactor tuning for a narrow band filter
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...
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7106149 |
Switchable tuneable bandpass filter with optimized frequency response
In a receiver, provision is made of a tuneable switchable bandpass filter comprising a primary resonant circuit and a first secondary resonant circuit. A second secondary resonant circuit can be...
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7102465 |
Frequency discrete LC filter bank
An inductive (“L”)-capacitive (“C”) filter bank has application for use in a television receiver. The LC filter includes inductors configured in at least one inductive (“L”) bank, and...
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7085122 |
MEMS tunable capacitor based on angular vertical comb drives
A MEMS tunable capacitor with angular vertical comb-drive (AVC) actuators is described where high capacitances and a wide continuous tuning range is achieved in a compact space. The comb fingers...
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7064557 |
Calibration circuit and method for filter bandwidth which is parasitic capacitance sensitive or insensitive
A calibration circuit and method causes a cutoff frequency to match the design frequency of low pass filter by adjusting a capacitor array in the low pass filter.
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7057452 |
Method and circuit for correcting the offset of an amplification chain
A circuit for correcting the offset of an amplification and filtering chain having a predetermined gain and cut-off frequency depending on the value of at least one capacitor, comprising: a...
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7049902 |
Tunable high-order bessel low pass filter
A tunable high-order Bessel low pass filter which is applied to a multi-rate duobinary generation system of an optical communication system. The tunable Bessel low pass filter comprises a variable...
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7034636 |
Tunable filters having variable bandwidth and variable delay
An apparatus for reducing influence by selected signal components in a communication link includes a first signal line conveying a first communication signal including a desired signal component...
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7015774 |
Noise filter and electronic apparatus having the same
A noise filter of the present invention includes an inductor and a resistor connected in parallel with each other. A power supply frequency current does not pass the resistor but passes through the...
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7012483 |
Tunable bridge circuit
A tuning circuit for use in an electrical circuit network is disclosed. The tuning circuit includes a bridge circuit. The bridge circuit comprises a first adjustable capacitance grouping, a second...
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7002435 |
Variable capacitance circuit, variable capacitance thin film capacitor and radio frequency device
There is disclosed a variable capacitance circuit which comprises: first to Nth variable capacitance elements C 1 -CN (N is an odd number) sequentially connected in series between an input terminal...
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7002427 |
Filter trimming
An adjustable phase shifter generates a phase shifted reference signal by introducing a phase shift in a reference signal. A phase detector identifies a phase difference between the reference...
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7002417 |
RC and SC filter compensation in a radio transceiver
Disclosed is apparatus for operating with an RC filter ( 26, 26 A), and a corresponding method. The apparatus includes circuitry ( 32 ) for use in measuring an actual value of at least one filter...
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6982614 |
Multi-mode filter
The invention provides a filter network comprising a plurality of circuit branches, each circuit branch comprising one or more filter elements. At least one of the circuit branches comprises a...
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6975187 |
Continuously tunable waveguide filter
A continuously variable waveguide filter ( 100 ). The variable waveguide filter can include at least one waveguide filter cavity ( 154, 156, 158 ) and a fluid dielectric ( 108 ) having a...
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6965275 |
Method and apparatus for tuning a filter
A method and an apparatus for tuning a filter is provided wherein the filter has at least one adjustable element for adjusting at least one performance parameter of the filter like for example a...
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6954115 |
Methods and apparatus for tuning successive approximation
A method for tuning a filter to a desired frequency using successive approximation. Elements of the filter are selected according to a control code used to vary the filter's oscillation frequency....
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6924716 |
Method and apparatus for reduction of electromagnetic feed through in a SAW filter
An apparatus for improving the stop band response of a surface acoustic wave device ( 200 ) comprising a surface acoustic wave device ( 200 ) having internal electromagnetic coupling ( 106 ) and...
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6909344 |
Band switchable filter
A ferro-electric filter and method of tuning same. The filter includes a switch for switching between quarter wave resonator and half wave resonator modes. The filter also includes a ferro-electric...
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6898450 |
High temperature superconducting tunable filter with an adjustable capacitance gap
A tunable filter having a fixed substrate, a first and second plate comprising a high-temperature superconductor material on the fixed substrate, a movable substrate, a mechanical driver attached...
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6895190 |
Switchable bandwidth lowpass filter
A novel transceiver is provided which allow for either a transmitter or receiver to be dynamically switched between two different frequency bands by use of a novel switchable lowpass filter.
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6894580 |
Filter tuner system and method
A system and method for a filter tuner is presented. The system comprises a sequential logic, a register, a comparator, a first and second counter, a synchronizing logic, a first and second...
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6888430 |
Integrated radiofrequency circuit component having a trimming diode controlled by a trimming voltage provided by a D/A converter
An integrated component for radiofrequency applications has a resonant circuit with tuning diodes and trimming diodes that are connected in parallel. A programmable conductor network generates a...
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6888422 |
Continuously variable filter
A continuously variable filter ( 110 ) that includes at least one filter element ( 146 ). The filter also includes a fluidic dielectric ( 108 ) having a permittivity and a permeability, a...
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6882246 |
System and method for an electronically tunable frequency filter having constant bandwidth and temperature compensation for center frequency, bandwidth and insertion loss
A novel system and method for a frequency tunable filter is described. The inventive system and method may be used, for example, in multi-band cellular phones and/or transceivers in wireless...
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6882245 |
Frequency discrete LC filter bank
An inductive (“L”)-capacitive (“C”) filter bank has application for use in a television receiver. The LC filter includes inductors configured in at least one inductive (“L”) bank, and...
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6867666 |
Variable filter using fluid dielectric
A variable RF filter ( 102 ) which includes one or more filter elements ( 104,106 ). The filter elements ( 104,106 ) can be formed from a structure selected from the group consisting of stripline,...
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6864759 |
Rotary signal coupler
A rotary signal coupler for providing signal coupling to a Surface Acoustic Wave (SAW) device ( 4 ) mounted on a shaft ( 5 ) includes a first electrically conducting loop ( 21 ) mounted on a disc (...
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6801103 |
Noise filter
A noise filter 10 of the present invention includes an inductor 71 and a resistor 11 connected in parallel with each other. A power supply frequency current bypasses the resistor 11 but...
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6791430 |
Resonator tuning assembly and method
A device and method for tuning a planar filter through a wide range of center frequencies are disclosed. The tuning assembly includes a superconductive tuning tip and an actuator configured and...
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6781474 |
Apparatus and method for tuning a filter
An apparatus and method for tuning a filter ( 11 ) with oscillator alignment for applications where the filter tuning signal ( 19, 27 ) is generated independently of the local oscillator tuning...
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6765452 |
Method and apparatus for damping an LC filter
A method for damping an LC filter coupled to a converter and generating a filter signal. The method comprises sensing the filter signal and processing the filter signal to generate a corresponding...
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6750734 |
Methods and apparatus for tuning an LC filter
A receiver, such as a television receiver, tunes an inductive (“L”) and capacitive (“C”) filter based on a desired frequency. The LC filter includes a plurality of inductors, configured in...
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