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7561861 |
Tuning circuit
A tuning circuit of a filter is disclosed to correct a cut-off frequency of the filter. The tuning circuit comprises a current generation unit which includes a first transistor and a resistor, and...
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7558552 |
Integrated circuit and method of generating a bias current for a plurality of data transceivers
Various embodiments of the present invention relate to circuits for and methods of generating a bias current for a plurality of data transceivers on an integrated circuit. According to one...
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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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7349034 |
Television tuner using integrated circuit
An integrated circuit is provided with a power supply terminal and an external circuit connecting terminal which is DC insulated from an internal high-frequency circuit and is connected to an...
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7330708 |
Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus
There is disclosed a tuning circuit having a coil and a capacitor comprises a resistance-adjustment circuit connected in parallel with the coil and the capacitor. The resistance-adjustment circuit...
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7295822 |
Radio wave receiver, radio-controlled timepiece and tuning capacitance setting method
A radio wave receiver for receiving radio waves having a predetermined frequency, the receiver comprises an antenna, an variable capacitor connected to the antenna, a memory, and a controller which...
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7266388 |
Transmitting circuit and communication terminal unit therewith
When a signal of GSM 900 frequency band is transmitted, a bias voltage setting circuit sets an optimum bias voltage for the GSM 900 frequency band to a first stage amplifier and a second stage...
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7171178 |
Tuning circuit having amplitude-varying function
A tuning circuit having an amplitude-varying function is disclosed that comprises a coil, a capacitor, and a resistance-adjusting element connected in parallel to the coil and the capacitor for...
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7146199 |
Cordless digital audio headphone
A cordless digital audio headphone is disclosed. The headphone includes a pair of earphones connected to a headband. The earphones provide audible signals. The headphone also includes a memory unit...
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7142818 |
Systems and methods for reducing radio receiver interference from an on-board avionics transmitter
Systems and methods for reducing interference in an enhanced radio receiver from a transmitter when both are located in the same aircraft are provided. The enhanced radio receiver detects and...
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7031683 |
Apparatus and methods for calibrating signal-processing circuitry
A calibration circuitry includes an adjustable capacitor, a voltage generator, a reference voltage generator, and a controller. The reference voltage generator provides a reference voltage. The...
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7019790 |
Integrated tuner circuit and television tuner using an integrated tuner circuit
An integrated tuner circuit includes a first terminal to which a UHF TV signal is input via a UHF amplifier. The amplifier is switched to an operating state when a UHF TV signal is received. A...
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6920316 |
High performance integrated circuit regulator with substrate transient suppression
A regulation circuit, incorporated in a single integrated circuit with a first circuit load, which as an input coupled to a power supply which produces a source voltage, and a first output coupled...
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6714771 |
Broadcast radio signal seek circuit
A broadcast radio frequency receiver includes an improved seek circuit receiving analog radio signals via an antenna according to a signal seek process wherein the frequency of the analog radio...
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6624743 |
Automatic adjusting responder with no self-contained power supply
In a non-contact IC card, a driving portion 5 sequentially switches a resonance frequency of a resonance circuit 1 . A reference voltage generating portion 6 receives an output voltage of...
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6615031 |
Heterodyne stage for high-frequency receivers
In a heterodyne stage having a separating filter providing broadband termination for an output of a mixer, a resistance having the value of a system impedance is arranged between the separating...
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6553216 |
RF tunable filter arrangement with tunable image trap
A tuner includes a tunable filter for selecting a desired RF signal in response to a tuning control signal and a tunable image trap for rejecting the undesired image signal corresponding to the...
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6424824 |
Apparatus for setting the tuning voltage of tunable resonant circuits
A setting apparatus for setting the tuning voltage of a tunable resonant circuit has an amplification device which amplifies an oscillator tuning voltage, output by a phase locked loop, nonlinearly...
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6400935 |
Pilot tone detector
An apparatus and method for detecting the presence of a signal component in an arbitrary signal, where the signal component has a desired frequency. The apparatus includes an error signal generator...
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6188970 |
Method of calibrating a multistage selective amplifier
In a method for calibrating or aligning a multistage selective amplifier including an oscillator circuit and at least one tuning circuit, the tuning voltages respectively necessary for aligning the...
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5953642 |
System for contactless power and data transmission
In a system for contactless power and data transmission, a transmitting or receiving station has at least one transmitting or receiving resonant circuit which is driven by an integrable control...
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5845200 |
Method and an apparatus for automatically tuning a receiver
An automatic tuning apparatus for a receiver has a tuning unit, a ROM and a voltage converting unit. At the time of adjustment of the tuning unit, tuning voltages are supplied to the tuning unit...
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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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5745844 |
Receiver control in a communication device by antenna de-tuning in strong signal conditions, and method therefor
A communication device (100) including an antenna (110) for receiving a signal. A receiver circuit (12) is coupled to the antenna (110) and demodulates the signal which is received by the antenna...
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5742898 |
Tuning system with DC-DC converter
In a tuning system, a DC-DC converter DDC provides a tuning control voltage Vt for a tuner TUN. The DC-DC converter DDC is in the form of a series arrangement of an AC source CAC, an inductive...
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5483688 |
Adaptive automatic antenna tuning method and apparatus
An improved method and apparatus for automatically tuning an antenna includes adaptive antenna tuning based on a current radio reception frequency and on prior antenna tuning cycles to establish a...
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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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5408688 |
Method and a device pertaining to an electro-mechanically controlled resonance module
Method and apparatus in mobile telephone system including base stations with a plurality of resonance modules, for separately adjusting each resonance module to its own frequency for receiving and...
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5189593 |
Integrated distributed resistive-capacitive network
An integrated-distributed-resistive-capacitive network (100) having a high dielectric electronically-tunable semiconductor integrated capacitor. The network (100) also includes a resistive layer...
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5136719 |
Automatic antenna tubing method and apparatus
A wristwatch paging receiver is provided with an antenna matching network that automatically retunes the network at the beginning of a listening interval. During the retuning operation, a control...
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5040239 |
Tuning circuit and receiver
In a tuning circuit, use is made of a current-controlled type variable inductor comprising a tuning coil and a control coil for controlling the magnetic flux density of the tuning coil. The tuning...
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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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4996599 |
Television tuner oscillator with three point tracking
The present invention concerns apparatus for changing the effective tuning inductance with a change of frequency of a multi-band oscillator, said frequency being controlled in response to the...
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4984296 |
Tuned radio apparatus
A tuned radio apparatus includes a tuned radio receiver and a tuned antenna apparatus both of which are tuned to the same frequency. The antenna apparatus may include a varactor similar to a...
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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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4862516 |
System for automatically tuning the antenna of a miniature portable communications device
An antenna tuning apparatus for a portable communications device which includes a means of adapting the device to be worn on the body is described. The device consists of an antenna, tuning means...
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4849721 |
Bandpass filter for a CATV converter
A bandpass filter for a CATV converter is of the structure with a low-pass filter section with low-pass filters connected longitudinally in a plurality of stages and a high-pass filter section, and...
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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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4743866 |
Wide range oscillator
A local oscillator is arranged in a Colpitts type configuration in which an amplifying device such as a bipolar transistor or field effect transistor having a control electrode (base or gate...
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4742564 |
Tuning alignment data memory device for tuning circuits tunable to selectable frequencies
The invention relates to a tuning memory device for tuning circuits to selectable frequencies and in which digital tuning data corresponding to said frequencies are stored in a programmable memory....
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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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4703286 |
Dual gate tunable oscillator
A dual gate field effect transistor (FET) is configured as a self-buffering local oscillator of a tuner by arranging the FET in a cascode configuration in which the first gate electrode is coupled...
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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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4658437 |
Tuning voltage tracking arrangement
A superheterodyne receiver having a plurality of selectable bands includes a tuning voltage source and a band selection signal source. To improve tracking, the receiver includes a selectively...
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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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4641190 |
Muting system
A blanking signal is generated in a television receiver when a channel change selection is made. The blanking signal is low-pass filtered and thereafter controls the muting of the audio channel....
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4630118 |
Automatic frequency control circuit for a television signal receiving apparatus
An AFC circuit is employed in a television signal receiving apparatus which comprises a tuner having a local oscillator and a mixer for mixing a received high-frequency video signal and an output...
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4628540 |
Tuning arrangement having a substantially constant frequency difference between an RF-circuit and an oscillator circuit
A tuning arrangement including a mixer stage, a tunable RF-circuit coupled to an input of said mixer stage, an oscillator circuit, coupled to another input of said mixer stage, having a tunable...
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