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Class 455/193.2 - With plural resonant circuits


Subclass of Class 455 - Telecommunications
Definition: Subject matter wherein the tunable antenna circuit includes
No. of patents: 42
Last issue date: 01/05/2010


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NumberTitleIssue Date
7643809Method and apparatus for tuning RF integrated LC filters
Using low impedance switches and coupling to a virtual ground, one or more capacitors are selectively switched into or out of an inductive-capacitive resonant circuit portion of an integrated circuit filter to alter the resonant frequency based on a phase difference...
01/05/2010
7389091High-frequency amplification circuit
A resonance circuit comprising, for example, an inductor and a plurality of capacitors is provided as a load of a transistor. The capacitors are changed over by a switch. As the capacitors are changed over by the switch, a resonance frequency is changed according to...
06/17/2008
7349691System and apparatus for performing broadcast and localcast communications
Described is a communication system including mobile communication devices. In the described system, the mobile devices many be wrist-worn watches such as are in common use today, except that the watches are specially configured to receive data in a “broadcast” ...
03/25/2008
7330708Tuning 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 changes a resistance of the tuning circuit when resonant. The resista...
02/12/2008
7286804Receiver digital-analog converter and tuning circuit
An object of the present invention is to provide a receiver, a digital-analog converter and a tuning circuit in which temperature compensating components can be formed on a semiconductor substrate while reducing component costs. An FM receiver 100 is constitu...
10/23/2007
7269399Receiver of double conversion system with antenna tuning with variable capacitance using digital-to-analog converter having temperature coefficient setting section
A receiver of double conversion system wherein unwanted components included in received signals can be removed without fail and wherein the number of constituent parts has been reduced. The receiver comprises an antenna tuning circuit 10 including a tuning co...
09/11/2007
7248838Wireless communication system within a system on a chip
A communication system for transmitting data between cores embedded in an integrated circuit on a silicon chip. Communication system includes transmitter circuitry for wirelessly transmitting data between cores and receiver circuitry for wirelessly receiving the tra...
07/24/2007
7245891Wireless mobile communication device having a speaker vibration alert and method of using same
A mobile wireless communication device has a speaker that functions as a vibration alert in addition to an audio output device. The speaker is selected from a group of speakers having variation in mechanical vibration resonant frequency. A drive signal sweeps back a...
07/17/2007
7228119Apparatus and method for a radio frequency (RF) receiver front end pre-selector tuning for improving the reduction in intermodulation distortion (IMD)
A system and method of improving the rejection of intermodulation (IM) distortion in receivers (100) employing varactor tuning preselecters by exploiting the attenuating properties of a tunable preselecter at specific voltages. The invention takes advantage o...
06/05/2007
7190933Method and apparatus for automatic tuning of a resonant loop antenna in a transceiver circuit
Disclosed is a circuit and method for automatic tuning of a resonant circuit in a transceiver having a receiver and a transmitter that includes a power amplifier for driving the resonant circuit. During a transmit mode of the transceiver, a resonance voltage of the ...
03/13/2007
7184733High frequency receiving device, integrated circuit used for the same, and TV receiver using them
An oscillation frequency changing means is inserted between a tuner and an oscillator of local oscillator (56) of a high frequency receiving device, and the oscillation frequency changing means, in each frequency band received, changes the oscillation frequen...
02/27/2007
7171178Tuning 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 varying resistance at time of resonance of the tuning circuit, wherein t...
01/30/2007
7146137High-frequency switch
To provide a high frequency switch capable of dealing with multiple frequency bands without having plurality of switch circuits. A first diode that conducts due to a bias current when a first switch is closed is interposed between first signal terminal and a second ...
12/05/2006
7142833Matching unit
A matching unit includes a switching means for switching an inductance of a first inductor. This switching means sets an inductance such that a first inductor shows an inductance property to both of the VHF low-band and high-band, and shows a capacitance property to...
11/28/2006
7116954Tunable bandpass filter and method thereof
The present invention provides a tunable bandpass filter and method thereof. In a preferred embodiment, the tunable bandpass filter uses variable ferro-electric capacitors to adjust both the passband and the notch across the normal operating range of a wireless comm...
10/03/2006
7103320Wireless communication system within a system on a chip
A communication system (8) for transmitting data between cores (10) embedded in an integrated circuit on a silicon chip (12). Communication system (8) includes transmitter circuitry (24) for wirelessly transmitting data between cor...
09/05/2006
7088984Electronic tuner
An electronic tuner of the present invention is arranged such that between an input part of the amplifying circuit and the ground serially connected are a coil and a diode, and a capacitor is connected between the ground and a connecting part between the coil and th...
08/08/2006
7065331Resonator configuration
A resonator system and method are provided which includes/uses a tunable reference resonator, parts for tuning the reference resonator to a reference value via a controlled variable for the reference resonator, a tunable circuit resonator, and parts for tuning the c...
06/20/2006
6940358Method and apparatus for tuning RF integrated LC filters
Using low impedance switches and coupling to a virtual ground, one or more capacitors are selectively switched into or out of an inductive-capacitive resonant circuit portion of an integrated circuit filter to alter the resonant frequency based on a phase difference...
09/06/2005
6933984Television tuner which maintains UHF band tuning circuit bandwidth constant in low to high band range
A tuning circuit's bandwidth is maintained almost constant throughout a UHF low to high band range so as to prevent interference by a neighboring channel, particularly in receiving high band television signals, and also to improve NF in receiving low band television...
08/23/2005
6889036Integrated frequency selectable resonant coupling network and method thereof
An integrated center frequency selectable resonant coupling network suited for use in an integrated circuit is disclosed. The network includes an integrated coupling transformer having a secondary winding for coupling to a load and a primary winding for coupling to ...
05/03/2005
6750734Methods 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 at least one inductive (“L”) bank, and a plurality of capacitors ...
06/15/2004
6615031Heterodyne 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 filter and a following intermediate-frequency filter, the res...
09/02/2003
6393264Radio terminal apparatus
A portable radio terminal apparatus for transmitting and receiving signals in different frequency ranges which has an apparatus for switching the radio terminal apparatus over into a respective frequency range, an antenna and a first antenna matching circ...
05/21/2002
6343208Printed multi-band patch antenna
The present invention provides a miniature, built-in multi-band antenna which is suitable for use in future compact mobile terminals. According to exemplary embodiments, a built-in patch antenna is provided which includes patch elements of different sizes...
01/29/2002
6134427Using a single low-noise amplifier in a multi-band wireless station
A wireless communication device, such as a dual-mode cellular phone, receives radio frequency (RF) signals in either of two communication bands. Each received RF signal is passed to two bandpass filters, one for each communication band, the outputs of whi...
10/17/2000
6125269TV 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
6122493Radio receiver having automatic broadcasting-station selecting function
The capacitance value of a variable capacitance element of an RF tuning circuit is controlled in accordance with a control signal Vx. When an automatic search start signal is supplied to a frequency control circuit, frequencies of the local oscillation si...
09/19/2000
6064866Switchable bandpass filter for a multiband tuner
To achieve a high passband attenuation, a switchable bandpass filter for a multiband tuner, includes at least a capacitance diode for frequency-tuning of at least a resonant circuit of the bandpass filter, and a switching diode arranged at the input and t...
05/16/2000
5999793Satellite receiver tuner chip with frequency synthesizer having an externally configurable charge pump
The problems outlined above are in large part solved by an improved DBS receiver front end architecture having a tuner chip and a demodulator/decoder chip. The front end includes a frequency synthesizer with an externally configurable charge pump on the t...
12/07/1999
5978663Antenna 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 eliminate a disturbance at a frequency higher than the image ...
11/02/1999
5739874Tuning system for a digital satellite receiver with fine tuning provisions
An economical tuning system for a digital satellite television receiver includes a phase locked loop (PLL) tuning control IC of the which is normally used in a tuning system of a conventional terrestrial broadcast or cable television reciever to control t...
04/14/1998
5548821Adaptive system for self-tuning and selecting a carrier frequency in a radio frequency communication system
A system for adaptive self-tuning of a receiver in a radio communication system. Prior to transmission of each data packet from a transmitter to a receiver, the transmitter generates a sequence of predefined test bytes (test sequence) n times at an initia...
08/20/1996
5524288Tuning of a radio receiver
The present invention relates to a method of tuning a radio receiver to a desired frequency. The frequency of each tuning circuit in the radio receiver is controlled by controlling the capacitance diodes of the tuning circuits. The control is accomplished...
06/04/1996
5491715Automatic antenna tuning method and circuit
A method of matching the resonant frequency of an antenna resonant circuit (18, 46) to the output frequency of a transmitter output stage (26), the method includes the step of providing a powering signal from the transmitter output stage (26) to the anten...
02/13/1996
5438699Adaptive system for self-tuning a receiver in an RF communication system
A system for adaptive self-tuning of a receiver in a radio communication system. Prior to transmission of each data package from a transmitter to a receiver, the transmitter generates a sequence of predefined test bytes (test sequence) n times. An identic...
08/01/1995
5428829Method and apparatus for tuning and aligning an FM receiver
A method for tuning and aligning an electronically tuned FM broadcast receiver is described. The system described compensates for the mismatch of component values between the antenna and RF amplifier tuned circuits, and the IF offset between the local osc...
06/27/1995
5408688Method 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 expediting telephone signals at this frequency. In each re...
04/18/1995
5399977Microwave power source apparatus for microwave oscillator comprising means for automatically adjusting progressive wave power and control method therefor
In a microwave power source apparatus for a microwave oscillator for generating a microwave, a DC power source supplies a DC power for generating the microwave to the microwave oscillator. A measuring section of a voltage standing wave detector is mounted...
03/21/1995
5349700Antenna tuning system for operation over a predetermined frequency range
A tunable antenna system operates over a predetermined frequency range with an antenna having a length and width each significantly less than a quarter wavelength within the predetermined frequency range. A controllable reactive element is coupled to the ...
09/20/1994
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