Matches 51 - 100 out of 302 < 1 2 3 4 5 6 7 >
Match Document Document Title
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...
6744335 Micromechanical tunable capacitor and an integrated tunable resonator  
An integrated tunable resonator for radio includes an RF resonator having a micromechanical tunable capacitor with high Q- (quality factor) value. A first conducting layer ( 4 ) forms the first...
6734761 Radio-frequency input stage  
A radio-frequency input stage is specified and has a radio-frequency coupling element which couples an air interface to the inputs of parallel-connected radio-frequency resonant circuits. In order...
6720843 Filter switching circuit having a shorter distance of connection for a higher frequency passband  
A filter switching circuit includes first and second amplifiers, relays, and bandpass filters in which a bandpass filter having a higher frequency passband is selected by a smaller number of relays...
6703911 Very high frequency (VHF) sharp tuned elliptic filter and method  
A sharp-cutoff VHF elliptic filter includes a folded signal path and internally coupled feedback in a conductive enclosure. Sized for the power requirements of commercial television broadcast...
6686814 Voltage tunable varactors and tunable devices including such varactors  
A voltage tunable dielectric varactor includes a substrate having a low dielectric constant and having generally planar surface, a tunable ferroelectric layer positioned on the generally planar...
6677834 Filtering device for filtering out supply voltage interferences  
A filtering device for filtering out a supply voltage interference of a voltage source that delivers a supply voltage for an electrical load, in which the filtering device includes a capacitor that...
6664870 Compact 180 degree phase shifter  
A phase shifter for changing the phase of a signal fed thereto. The phase shifter includes an inductive reactance element and a capacitive reactance element having one electrode connected to either...
6653912 RF and microwave duplexers that operate in accordance with a channel frequency allocation method  
A duplexer is provided that includes a first tunable bandpass filter, a second tunable bandpass filter and means for coupling the first bandpass filter and the second bandpass filter to an antenna....
6636128 Frequency-tunable notch filter  
A new type of frequency-tunable active notch filter achieves frequency selectivity through interaction among input derived signal components that are passed through parallel signal channels in a...
6593828 System and method for filter tuning  
A system and method for filter tuning are presented. The system comprises means for adjusting the components of a filter by coarse adjustments such that the filter is set with an initial cutoff...
6577208 Radio frequency filter  
Disclosed is a radio frequency filter used for a mobile communication apparatus such as a mobile phone, having an inductor component, a capacitor component, and a resistor component formed of a...
6573811 Resistor tuning network and method for microelectronic RC-based filters  
A resistor tuning network for an RC filter has a first, fixed resistor and a second, variable resistance connected in parallel with the fixed resistor. The variable resistance is an R-2R ladder...
6549097 Electrical resonator with a ribbon loop and variable capacitors formed at the parallel ends  
An elementary electrical resonator which includes a ribbon conductor forming a flat loop with at least one turn, the conductor having ends which form two parallel segments. The resonator further...
6549096 Switched inductor/varactor tuning circuit having a variable integrated inductor  
The magnetic field of an inductor is decreased by the presence of one or more single loop windings positioned in proximity to the inductor. The single loop windings have open circuits that are...
6545569 Filtering device and method of eliminating a DC component by shifting the transfer function  
Filters and methods for eliminating a DC component from an electronic signal provide for circuitry having a zero corresponding to a cut-off frequency, and circuitry for shifting the zero by an...
6538531 Multilayered LC composite component and method for adjusting frequency of the same  
A multilayered LC composite component in which a fine adjustment to a desired frequency can be performed, includes multilayered body sheets on which internal electrodes including capacitor...
6535722 Television tuner employing micro-electro-mechanically-switched tuning matrix  
A tuning circuit, as for a television receiver or video recorder, employs switchable tuning circuits including micro-electronic electro-mechanical switches for selecting the ones of an array of...
6522220 Frequency variable filter, antenna duplexer, and communication apparatus incorporating the same  
A frequency variable filter in which both the frequency of an attenuation pole and the attenuation bandwidth can be varied. In the frequency variable filter, two serial resonance sections composed...
6518859 Frequency controlled filter for the UHF band  
The filter is composed of a series of cells (E 1 -E 4 ) Coupled to each other by coupling capacitors (Cc 12, Cc 23 and Cc 34 ), each cell forming a resonant circuit composed of at least one...
6504443 Common anode varactor tuned LC circuit  
A voltage controlled oscillator circuit in which the principal frequency determining circuit or tuning circuit comprises a pair of common anode varactor diodes. The circuit functions as a variable...
6492883 Method of channel frequency allocation for RF and microwave duplexers  
A method is provided for operating a duplexer including a first tunable bandpass filter, a second tunable bandpass filter and means for coupling the first bandpass filter and the second bandpass...
6472957 Low power switchable filter tuner  
A switchable filter for passing one of a plurality of frequency bands has n bandpass filter sections coupled in parallel between a filter input terminal and a filter output terminal. Each of the n...
6472956 Tunable input trap circuit and image trap circuit  
An input trap circuit removes a predetermined frequency component included in an input signal and then outputs the input signal to a circuit at a later stage. The input trap circuit is provided...
6470173 Filter unit comprising a wideband bandpass filter and one band-elimination filter  
A filter unit comprises a wideband bandpass filter; at least one band-elimination filter having a stop band within the passband of the bandpass filter, so that the passband is divided into a...
6466114 Resonator with variable resonance frequency  
The invention relates to a resonator ( 200,300 ) with variable resonance frequency, intended for connection to an amplifier, thus forming an oscillator, said resonator comprising a resonator...
6441701 Tunable bridged-T filter  
A tunable filter ( 300 ) includes first ( 302 ) and second ( 304 ) “bridged-T” resonators. The first ( 302 ) and second ( 304 ) resonators are capacitively coupled together via bandwidth...
6433658 High Q structure  
A structure ( 110, 150 ) for enhancing the quality factor (Q) of a capacitive circuit ( 112, 152 ). The capacitive circuit ( 112, 152 ) includes a first resistance ( 122, 164 ), a capacitance (...
6426683 Integrated filter with improved I/O matching and method of fabrication  
An integrated filter circuit and a method of fabrication are disclosed, wherein the integrated filter has an input and an output parasitic shunt impedance. Input and output electrical components...
6414562 Circuit and method for impedance matching  
An impedance matching circuit ( 10 ) matches the impedance of a load ( 19 ) coupled to an RF amplifier ( 12 ) to that of the RF amplifier ( 12 ). The impedance matching circuit ( 10 ) samples a...
6407633 Methods and apparatus for stabilizing feedback-controlled amplifiers  
An apparatus (Z) having controllable impedance is inserted from output ( 22 ) to ground ( 23 ) of an audio-signal amplifier ( 20 ). Typically, the apparatus comprises a switch-chain ( 50 ) having...
6392501 Method and arrangement for tuning a resonator  
The invention relates to a bandpass filter that follows the frequency of an input signal especially for reducing the noise on the receive band of mobile communications devices. More specifically...
6307443 Bandpass filters with automatic tuning adjustment  
A method and system for tuning a tunable bandpass filter includes a bandpass filter having a passband which is dependant on the value of a tuning signal. A data signal having a dominant frequency...
6307442 Enhanced LC filter with tunable Q  
A tunable electronic filter circuit is provided including an input terminal and an output terminal connected to the input terminal with a node therebetween. An inductor, a variable capacitor, and a...
6262638 Tunable and matchable resonator coil assembly for ion implanter linear accelerator  
A resonator circuit capable of resonating at a predetermined frequency is provided. The resonator circuit comprises a fixed position coil inductor (62) having a longitudinal axis (92) and a...
6239675 Tuning circuit having switchable capacitor controlled by a selection circuit  
An electronic system 8 is disclosed herein. The system includes circuitry 10 for processing a signal and a plurality of antennas 12a-12b. A plurality of switches 22a-22b are also included. Each of...
6150901 Programmable RF/IF bandpass filter utilizing MEM devices  
A programmable high frequency (HF) bandpass filter is disclosed. The programmable filter has a tunable bandwidth and center frequency over a large range of the radio frequency (RF) and intermediate...
6130590 Programmable filter bank having notch filter and bandpass filter frequency responses  
An inexpensive to produce and small profile programmable filter bank with a high quality factor that applies an adjustable frequency response to an input signal to produce a filtered output signal....
6111478 Filter with a switch having capacitance  
A filter 10 (30) includes a laminate body 11 (31), PIN diodes PD1 and PD2 of switching elements and choke coils CC1-CC2 are mounted on a top surface or a principal face of the laminate body 11, and...
6101371 Article comprising an inductor  
An article comprising a micro-machined, passively self-assembling inductor is disclosed. The inductor is fabricated using MEMS technology and advantageously utilizes materials compatible with CMOS...
6097269 Electrically tunable band pass filter with symmetrical low-side and high-side protection  
A tunable filter (400) provides dual injection mode operation over a continuously tunable frequency range (500). A combination of mirrored series resonant circuits (432, 446) tuned through...
6087906 Absorbent amplitude filter  
An absorbent amplitude filter for HF signals employs a reflective filter and an absorption circuit comprising a load resistor. The absorption circuit inventively comprises another λ/4 line...
6084486 Controllable filter and high frequency apparatus using the same  
A filter comprises an inductor, a first variable capacitance diode, a second variable capacitance diode having nearly identical characteristic as the first variable capacitance diode, a control...
6054908 Variable bandwidth filter  
A variable bandwidth filter that includes either a parallel or series combination of a fixed impedance, such as a capacitor, and a variable impedance, such as a variable capacitor. The series and...
6028353 Chip bead element and manufacturing method thereof  
The present invention relates to a laminated chip bead element demonstrating noise absorption characteristics over a broad range in a high frequency range of GHz or higher. An insulating body is...
6023406 LC composite component with variable capacitor and inductor  
An inductance/capacitance (LC) composite module with a built-in variable capacitor and coil is disclosed which includes a dielectric substrate having one principal surface on which a stator-side...
6018279 Radio frequency coupler  
5978663 Antenna tuning circuit  
An antenna tuning circuit of a tuner with a band switching device, which can eliminate an image disturbance and a disturbance due to a UHF band frequency at reception of a high band and further...
5945889 Method and apparatus for tuning high Q bandpass filters using pulse excitation  
A high Q bandpass filter (102) is tuned by applying a transient (204) to the filter to cause it to ring. The ringing of the filter produces an output damped oscillatory waveform (206) whose zero...
5920241 Passive temperature compensating LC filter  
A phase shifter in which the change in phase changes with changes in temperature. The phase shifter includes a plurality of capacitors and inductors connected in series relation to form a filter...
Matches 51 - 100 out of 302 < 1 2 3 4 5 6 7 >