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| Number | Title | Issue Date |
| 7436276 | Tuning circuit preventing a deterioration of Q value A tuning circuit comprises, at least, a first circuit K1 which serially connects a first variable capacitor element 21a and a second variable capacitor element 31a, an inductance element 23a which is parallely connect... | 10/14/2008 |
| 7427907 | Boosted-bias tunable filter with dynamic calibration In a signal communication device, a frequency-selective filter has at least one component that is biased by a control signal to establish a center frequency of the frequency-selective filter. A closed-loop bias generator is provided to generate the control signal an... | 09/23/2008 |
| 7224241 | Extended matching range tuner In a T network tuner, a variable shunt capacitor is provided between the signal input and ground that is ganged to the variable input matching capacitor. The operation is mechanically arranged such that, as one decreases the capacitance of the variable input matchin... | 05/29/2007 |
| 6774737 | High Q resonator circuit A resonator circuit (10) has a pair of varactor diodes (13, 14), a capacitor (15), and a transformer (20) coupled in parallel with the capacitor and varactor diodes. Further, in order to provide a high frequency output an impedance invert... | 08/10/2004 |
| 6701779 | Perpendicular torsion micro-electromechanical switch A semiconductor torsional micro-electromechanical (MEM) switch is described having a conductive movable control electrode; an insulated semiconductor torsion beam attached to the movable control electrode, the insulated torsion beam and the movable contro... | 03/09/2004 |
| 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 circuit (205,305) for deciding the resonance frequency of the reso... | 10/15/2002 |
| 6181218 | High-linearity, low-spread variable capacitance array The invention provides a unique apparatus and method which varies the capacitance coupled to a circuit. In one embodiment, the variable capacitance comprises a unique variable capacitance array with multiple capacitance modules which can be selectively en... | 01/30/2001 |
| 5493715 | Multi-range voltage controlled resonant circuit A voltage controlled tunable resonant circuit (100) has at least two resonant frequency ranges and reduced self modulation, and includes a resonant element (120), a variable reactance element (130), and a first voltage variable capacitor (VVC) (150). The ... | 02/20/1996 |
| 4851798 | Unitary tuning structure A unitary tuning structure of a UHF tuner includes an inductance loop, an inductance adjustment element attached to a top portion of the inductance loop so as to be foldable with respect to the inductance loop about an axis parallel to the printed circuit... | 07/25/1989 |
| 4817193 | AM transmitter having single tuning means for oscllator, carrier isolator and antenna A radio frequency transmitter, amplitude modulated, having a single tuner that tunes the frequency oscillator, the isolating filter and the antenna impedance, all at the same time. The transmitter includes a tunable carrier generator for generating a carr... | 03/28/1989 |
| 4760325 | High frequency coil arrangement A high frequency coil arrangement, comprising an input side coil and an output side coil electromagnetically coupled with each other, the input side coil being divided into two coil elements having substantially equal inductances by provision of a tap, ch... | 07/26/1988 |
| 4683447 | Varactor tuning circuit for dielectric resonator stabilized oscillator Tuning varactor circuitry is disclosed for a dielectric resonator stabilized oscillator (2). A varactor diode (22) is electrically connected in a loop (24) with an RF bypass capacitor (26), and the voltage across the diode is varied. In a first embodiment... | 07/28/1987 |
| 4564822 | TV Tuner oscillator with feedback for more low frequency power An oscillator circuit suitable for use in a local oscillator of a tuner of a television receiver set. A feedback circuit comprised of a feedback capacitor (17) is connected between a junction of a tuning diode (10) and a correcting capacitor (11) connecte... | 01/14/1986 |
| 3970974 | Trimmer for a tuned UHF line A UHF tuner employing resonant cavities with tuned lines has a discrete air trimmer capacitor which includes a fixed electrode connected to the tunable line with one or more insulated turns of silver wire and a movable electrode guided into the fixed elec... | 07/20/1976 |
