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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...
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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...
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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...
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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...
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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...
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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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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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5745013 |
Variable-frequency oscillator configuration
A variable-frequency oscillator configuration, in particular for tuners, includes a feedback network for an oscillator amplifier. The feedback network contains a series circuit formed by two...
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5739730 |
Voltage controlled oscillator band switching technique
A band switchable resonant circuit for a voltage controlled oscillator has an inductive component in parallel with a plurality of varactor diodes. Some of the varactor diodes are selectively...
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5619283 |
Double tuned RF circuit with balanced secondary
A band switchable double tuned circuit having a balanced secondary is presented. A primary tunable tank circuit with a plurality of first inductances is tuned to a first frequency by a first...
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5469117 |
Voltage-controlled frequency oscillator
An oscillator comprising an amplifier device, a capacitive divider bridge whose terminals are connected between a control electrode of the device and a reference voltage, the intermediate junction...
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5463362 |
Tuner circuit having a switching diode to change receiving bands
A tuner circuit is basically composed of: a series of a low-band coil and a high-band coil disposed on the signal side; a series of a low-band coil and a high-band coil disposed on the earth side;...
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5379008 |
Variable impedance circuit providing reduced distortion
An electronic circuit (300) includes first (302) and second (304) variable impedance devices coupled together. The first (302) and second (304) variable impedance devices are designed such that...
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5285179 |
Double tuned circuit with balanced output and image trap
Conversion of an RF signal amplifier from an unbalanced signal configuration to a balanced signal configuration is provided while including an image trap for both sides of the balanced circuit. The...
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5214399 |
Circuit configuration for range changing in tuners
A circuit configuration, especially in a television set, for range switching in tuners having at least two ranges includes at least two preselector stages each being assigned a respective tuner...
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5204645 |
Circuit configuration for range switching in tuners
A circuit configuration for range switching in tuners having at least two ranges includes at least two preselector stages each being assigned to a respective tuner range. Each of the preselector...
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5166646 |
Integrated tunable resonators for use in oscillators and filters
An integrated tunable resonator (100) includes a common semiconductor carrier (110). Formed on the common semiconductor carrier (110) is an integrated voltage variable capacitor (104). A bulk...
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5028894 |
Bandpass filter circuit arrangement
A bandpass filter circuit arrangement in which a pair of parallel-resonant circuits (1, 2) are reactively intercoupled has a pair of signal input terminals (16, 17) connected to one of the resonant...
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5020146 |
Lossy constant bandwidth tuned circuit
An amplifier loaded with a constant bandwidth tuned circuit is provided with an output series coil, and with a resistance in series with the output coil and a subsequent load to provide attenuation...
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4972509 |
Band switching circuit of a tuner
In a tuner circuit in which a plurality of band signals are received by a single common high frequency amplifier stage, a band switching circuit switches a resonant circuit to λ/2 type when the...
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4921465 |
Varactor tuned UHF RF signal input circuit
An RF signal input circuit for a UHF tuner of a television receiver comprises a series-tuned circuit including a varactor diode and an inductance element connected in series, in the order named,...
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4850039 |
Transistor mixer
A mixer for mixing first and second signals for providing a difference signal comprises a mixing transistor. The first and second signals are applied between the base and emitter electrodes of the...
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4847572 |
Electronic tuning circuit for AM receiver
In an electronic tuning circuit for AM receiver including a radio-frequency tuning circuit and local oscillator circuit each using a variable capacitance diode, the local oscillator circuit...
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4823099 |
Television tuner for three different frequency ranges
A television tuner for three different frequency ranges comprises a common antenna connection for three input filter circuits (1, 2, 3). In order to obtain a simple circuit design which involves...
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4794650 |
Electronic tuning receiver
A receiver equipped with an electronic tuning circuit which uses voltage-variable reactance elements such as variable-capacitance diodes or the like in the radio-frequency tuning circuit and...
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4792989 |
Tuner circuits and voltage generators therefor
In a tuner circuit, the relatively high voltage used to control a varactor diode of the circuit is derived using a cascade of resistors and transistors under the control of a reference voltage...
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4736457 |
Circuit arrangement for a tuner for changing over two frequency bands
The invention relates to a circuit arrangement for a tuner, particularly a television tuner, for a change over switching between two frequency bands with the aid of a switching diode, said...
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4721985 |
Variable capacitance element controllable by a D.C. voltage
The invention relates to a variable capacitance element operating in the ultra-high frequency range. In order to integrate this element on to an integrated circuit chip, the element is designed so...
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4713631 |
Varactor tuning circuit having plural selectable bias voltages
A variable capacitance circuit includes a varactor having an anode side and a cathode side. A first variable bias voltage is applied to one of the sides and one of a plurality of voltages is...
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4710973 |
Varactor diode tuner with band switched coils and lines
A tuner in which a band switching signal corresponding to a channel selected from a plurality of UHF and VHF bands is generated to enable the formation of a suitable resonant circuit for receiving...
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4703292 |
Tuning circuit apparatus
In a tuning circuit apparatus comprising first and second tuning circuits having their tuning frequencies varied in a ganged fashion; a composite varactor device provides first and second Varicap...
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4675634 |
Variable-capacitance tuning circuit for high-frequency signals
In a variable capacitance tuning circuit for high-frequency signals, a first varactor diode is connected between either the receiving end or feeding end and ground, one end of a tuning coil is...
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4646360 |
Constant bandwidth RF filter with improved low frequency attenuation
A television tuner has a tuned circuit at the input of an RF amplifier. The tuned circuit has a varactor tuned parallel circuit and an output series coil for good high frequency attenuation and...
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4619001 |
Tuning systems on dielectric substrates
A tuning system employs a specific resonant circuit which includes two electrodes confronting each other through a dielectric interposed therebetween. Each of the two electrodes has at least one...
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4598423 |
Tuning circuit for a multiband tuner
A multiband local oscillator of a television tuner comprises a common collector transistor amplifier, a feedback circuit for conditioning the amplifier to oscillate in the wide range of frequencies...
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4596044 |
UHF-VHF combination tuner
A combination UHF-VHF tuner has a switching diode placed in series with a VHF high-range peaking coil so that the coil forms a parallel resonance peaking circuit when high-range VHF signals are...
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4593255 |
Varactor tuned Colpitts oscillator with compensating varactor for wide band width
An oscillation circuit includes as its principal components a Clapp capacitor and two feedback capacitors connected to each other and a resonance coil. A first series circuit including a first...
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4581768 |
VHF tuner
In a VHF tuner, feedback capacitance between the emitter of a local oscillating transistor and the ground in a local oscillator is changed at the low band receiving state and high band receiving...
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