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| Number | Title | Issue Date |
| 7821362 | 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... | 10/26/2010 |
| 7609134 | Variable tuning circuit using variable capacitance diode and television tuner The invention provides a variable tuning circuit capable of extending a variable range in a high frequency band, ensuring the value of L of an inductor to increase the value of Q of a circuit in a low frequency band, and preventing a reduction in gain, an increase i... | 10/27/2009 |
| 7501919 | 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... | 03/10/2009 |
| 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 |
| 7353011 | Method and apparatus for operating a PLL for synthesizing high-frequency signals for wireless communications A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitanc... | 04/01/2008 |
| 7304533 | Integrated channel filter using multiple resonant filters and method of operation A circuit includes a first filter comprising a first inductor coupled to a first variable capacitor, wherein the first filter is associated with a first resonant frequency. The circuit further comprises an amplifier coupled to the first filter and a second filter co... | 12/04/2007 |
| 7299018 | Receiver comprising a digitally controlled capacitor bank Receiver comprising an RF input filter including a digitally controlled capacitor bank with n capacitors being controlled by a tuning control signal for varying the tuning frequency of the RF input filter within a tuning range. For an improvement of the receiver in ... | 11/20/2007 |
| 7289780 | Band switchable type tuning circuit of television signal A band switchable type tuning circuit has first switch means interposed between a power supply Vcc and an anode of a switch diode, a first resistor whose one end is connected to a cathode of the switch diode, second switch means interposed between the other end of t... | 10/30/2007 |
| 7279994 | Variable capacitance circuit having on/off switch for variable capacitance function, and voltage controlled oscillator using the variable capacitance circuit A variable capacitance circuit capable of switching on and off a variable capacitance function, includes variable capacitance means formed such that variable capacitance elements whose capacitance values change according to a voltage value of a supplied capacitance ... | 10/09/2007 |
| 7280001 | Capacitor array segmentation In one embodiment, the present invention includes a capacitor array that may provide a selected capacitance to a digitally controlled crystal oscillator (DCXO). The array may include multiple sections each having at least one array portion, where each section is to ... | 10/09/2007 |
| 7263339 | Tuner comprising a voltage converter The invention relates to a tuner for converting a radio frequency signal into an intermediate frequency signal, said tuner comprising a voltage converter supplying a control signal, a mixer associated with an oscillator which is voltage-controlled by said control si... | 08/28/2007 |
| 7235862 | Gate-enhanced junction varactor A semiconductor junction varactor utilizes gate enhancement for enabling the varactor to achieve a high ratio of maximum capacitance to minimum capacitance. ... | 06/26/2007 |
| 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 |
| 7167697 | Reverse electronic tuning circuit for FM radio frequency-lock-loop circuits An electronic circuit having reverse scan tuning comprises an IC radio having the forward scan function, in which a VCO capacitor is connected in parallel to a series connected resistor and switch, and a second switch is connects an input to an IF limiter amplifier ... | 01/23/2007 |
| 7129792 | Apparatus and method for phase lock loop gain control using unit current sources A gain compensator compensates for the gain variation of a varactor-tuned voltage tuned oscillator (VCO) in a phase lock loop (PLL). The VCO includes a parallel LC circuit having multiple fixed capacitors that can be switched-in or switched-out of the LC circuit acc... | 10/31/2006 |
| 7102464 | Switched transformer for adjusting power amplifier loading A circuit includes a transmission line transformer coupled between an input and output port. An inductor may be selectively coupled into the ground return path of the transmission line transformer to alter the impedance transformation provided between the input and ... | 09/05/2006 |
| 7081663 | Gate-enhanced junction varactor with gradual capacitance variation A semiconductor junction varactor utilizes gate enhancement for enabling the varactor to achieve a high ratio of maximum capacitance to minimum capacitance. The varactor has a gate region (131 or 181) divided into multiple portions of differing zero-po... | 07/25/2006 |
| 7078787 | Design and operation of gate-enhanced junction varactor with gradual capacitance variation A semiconductor junction varactor is designed with gate enhancement for enabling the varactor to achieve a high ratio of maximum capacitance to minimum capacitance. The varactor has a gate region (131 or 181) divided into multiple portions of differing... | 07/18/2006 |
| 7026861 | Electronic door latch system with water rejection filtering A control circuit receives inputs from first and second field effect sensors. The control circuit produces a control output only if the second field effect sensor senses proximity or touch more than a predetermined time after the first field effect sensor senses pro... | 04/11/2006 |
| 7009472 | Linear tuning circuit and tuning method thereof A linear tuning varactor circuit has the first single-end varactor circuit, the second single-end varactor circuit and a voltage divider. The first single-end varactor circuit has tuning terminal receiving the tuning voltage to change the capacitance thereof The sec... | 03/07/2006 |
| 6993307 | Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitanc... | 01/31/2006 |
| 6965761 | Controlled oscillator circuitry for synthesizing high-frequency signals and associated method A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitanc... | 11/15/2005 |
| 6960964 | Oscillator An oscillator includes a transistor having a collector receiving a power supply voltage, a first capacitor connected between a base and an emitter of the transistor, a second capacitor connected between the first capacitor and ground, a resistor connected between th... | 11/01/2005 |
| 6927805 | Compactly-designed television receiver A television receiver intended to decrease the number of expensive SAW filters to achieve low cost and a compact design. A trap circuit is interposed between a mixer and a SAW filter. During reception of a television signal, one of the trap frequencies at which the ... | 08/09/2005 |
| 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 trimming voltage at a trimming input that enables the production of a s... | 05/03/2005 |
| 6853272 | Linear voltage controlled capacitance circuit A linear voltage controlled capacitance circuit is provided that includes a plurality of MOS varactor pairs. Each MOS varactor pair is operable to receive a first tuning voltage, a second tuning voltage, and a bias voltage unique to the MOS varactor pair. The capaci... | 02/08/2005 |
| 6842094 | Electronic component containing capacitance diodes, having different capacitance ranges, and circuit configuration containing the component An electronic component has at least a first diode and a second diode that are capacitance diodes. The characteristic curve of the second diode has a fixed, known relationship to that of the first diode. For example, the first diode and the second diode can have an ... | 01/11/2005 |
| 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 |
| 6593835 | Multiple-tuning circuit of tuner preventing selection characteristic deterioration In a secondary tuning circuit, a capacitor is provided between a connection point between a direct-current blocking capacitor and a tuning coil and a connection point between a varactor diode and another direct-current blocking capacitor. The capacitor, a... | 07/15/2003 |
| 6566953 | High-frequency amplifier circuit for UHF television tuner having less distortion A high-frequency amplifier circuit for a UHF television tuner includes an FET having a first gate for inputting a UHF band television signal and a second gate for applying an AGC voltage which varies the gain. The second gate is grounded via a series circ... | 05/20/2003 |
| 6509799 | Electrically tuned integrated amplifier for wireless communications An electrically tunable radio frequency (RF) amplifier includes a resonant circuit having a voltage variable capacitance as one of its elements. In one approach, a drain diffusion capacitance of one of the transistors within the amplifier is used as the v... | 01/21/2003 |
| 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 |
| 6255913 | Variable frequency oscillator circuit A variable frequency oscillator (VFO) circuit having an increased frequency tuning range to selectively obtain operating frequencies above and below a set frequency. The circuit includes a tank inductor connected in parallel with a tank capacitor for prim... | 07/03/2001 |
| 6125269 | TV FM receiver for multimedia applications A receiver for receiving both first-type reception signals, for example TV signals, and second-type reception signals, for example, FM-radio signals. The receiver may be used in multimedia applications. In the receiver, a reception signal is fed via an in... | 09/26/2000 |
| 6121835 | Variable time delay network, method and apparatus thereof A variable time delay network (210) includes segments (270, 260) which are connected in parallel to form variable time delay network (210). Segment (270) includes a varactor diode (222) and an inductive element (223) connected in series at an anode electr... | 09/19/2000 |
| 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 terminal for applying voltage to the first and the second var... | 07/04/2000 |
| 6035185 | Selective RF circuit with varactor tuned bandpass switched bandpass filters A selective RF circuit for a double conversion tuner includes three double tuned bandpass circuits, each of which is tunable over approximately one-third of the tuning range. Switching diodes are used at the input and the output of each of the bandpass se... | 03/07/2000 |
| 5963842 | Satellite broadcasting receiving tuner A satellite broadcasting receiving tuner having a band-pass filter capable of adequately attenuating and removing disturbing wave components having frequencies in the vicinity of 480 MHz and capable of being easily tuned to the high-end frequency. The tun... | 10/05/1999 |
| 5808531 | Voltage-controlled variable tuning circuit A tuning circuit is formed of inductors connected in series, voltage-controlled variable capacitance means connected in parallel to the inductors, switch means connected in parallel to one of the inductors and capacitance means connected in parallel to an... | 09/15/1998 |
| 5752179 | Selective RF circuit with varactor tuned and switched bandpass filters A selective RF circuit for a double conversion tuner includes three sections: low and mid band double tuned bandpass sections and a high band double tuned bandpass section. Each section includes tuning varactors and one or more coupling varactors. The var... | 05/12/1998 |
