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| Number | Title | Issue Date |
| 8099069 | Broadcast receiver for use in mobile communication terminal A broadcast receiver for use in a mobile communication terminal includes a receiving antenna and an antenna tuning circuit connected to the receiving antenna. The receiving antenna receives broadcast signals tuned to the resonant frequency of the antenna tuning circ... | 01/17/2012 |
| 7426373 | Electrically tuned resonance circuit using piezo and magnetostrictive materials An impedance tuning system, especially for a cellular telephone system. The system can be used to match the impedance of an antenna element with that of an output stage of a transmitter driving the antenna element. The system includes a piezo capacitor in parallel w... | 09/16/2008 |
| 7386065 | Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system A voltage controlled oscillator (VCO), suitable for use in a frequency shift keying (FSK) system. The VCO device comprises a switching varactor unit, having a first terminal and a second terminal, wherein the switching varactor unit produces a capacitance, according... | 06/10/2008 |
| 7365804 | Television tuner for balance-inputting signal to balanced mixer A television tuner includes an unbalanced tuning circuit and a balanced mixer provided at the next stage of the tuning circuit. An output port of the tuning circuit is grounded through a serial circuit composed of an inductive element and a capacitive means. The out... | 04/29/2008 |
| 7359672 | Apparatus and method for frequency conversion An apparatus for frequency up conversion and down conversion using frequency multiplier circuits. The frequency multiplier circuits receive a lower frequency signal and are operated in a forward direction to provide a higher frequency output. The same frequency mult... | 04/15/2008 |
| 7286804 | Receiver 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 |
| 7269399 | Receiver 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 |
| 7254755 | On-chip receiver sensitivity test mechanism An on-chip receiver sensitivity test mechanism for use in an integrated RF transmitter wherein the transmitter and the receiver share the same oscillator. The mechanism obviates the need to use expensive RF signal generator test equipment with built-in modulation ca... | 08/07/2007 |
| 7253781 | Antenna device radio unit and radar A resonance element array 200 is disposed between a primary radiator 1 and a lens 3. In the resonance element array 200, resonance elements of linear conductors and variable reactance circuits are arranged on a dielectric substrate. A con... | 08/07/2007 |
| 7248838 | Wireless 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 |
| 7236756 | Tuning signal generator and method thereof A front end tuning system includes a tuning signal generator. The tuning signal generator includes a digital-to-analog converter (DAC) to receive a pre-conditioned tuning signal at a reference input, to receive a digital value at a digital control input, and to prod... | 06/26/2007 |
| 7225992 | RFID device tester and method An RFID device tester includes coupling elements for capacitively coupling a reader to an RFID device to be tested. The reader may power the RFID device by sending an outgoing signal, such as an outgoing AC power signal, which may be rectified and/or reflected by th... | 06/05/2007 |
| 7176841 | Antenna device and radio communication apparatus using the antenna device An electrical signal is fed from one terminal of an antenna element, and the other terminal thereof is terminated by a variable reactance circuit. A reactance value of the variable reactance circuit is changed according to use state of a device to optimally set its ... | 02/13/2007 |
| 7132999 | Meander line antenna A meander line antenna formed by folding a conductive pattern of a folded dipole antenna in the shape of meander is disclosed. The basic structure of the meander line antenna includes a bottom half section formed by a folded conductive pattern, and a feeding point a... | 11/07/2006 |
| 7103320 | Wireless 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 |
| 7095989 | Frequency translating devices and frequency translating measurement systems with DC bias added to a mixer diode A frequency translating device (FTD) includes at least one mixer diode connected to down-convert a radio frequency (RF) to an intermediate frequency (IF) and to up-convert an IF to an RF and a source of direct current (DC) bias that is connected to the mixer diode. ... | 08/22/2006 |
| 7055753 | RFID device tester and method An RFID device tester includes coupling elements for capacitively coupling a reader to an RFID device to be tested. The reader may power the RFID device by sending an outgoing signal, such as an outgoing AC power signal, which may be rectified and/or reflected by th... | 06/06/2006 |
| 7030938 | Tuner and receiver apparatus A tuner and receiver apparatus that can output first transport stream data and second transport stream data having excellent bit error rate characteristics for two systems even when a first tuner portion and a second tuner portion are provided on one board. A first ... | 04/18/2006 |
| 6968168 | Variable oscillator A variable frequency oscillator comprising: an oscillatory circuit for generating a periodic output dependent on the capacitance between a first node and a second node of the circuit, and having a capacitative element connected between the first node and the second ... | 11/22/2005 |
| 6933984 | Television 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 |
| 6907234 | System and method for automatically tuning an antenna An apparatus and method is related to a wireless system with an antenna that is automatically tuned to a desired frequency. The antenna is coupled to an adjustable tuning circuit to form a tuned antenna circuit that has a resonant frequency. The adjustable tuning ci... | 06/14/2005 |
| 6876401 | FM-broadcast-receivable television tuner for preventing adjacent-channel interference A trap circuit system includes a first trap portion and a second trap portion. In the first trap portion, a first capacitor is provided in parallel to a first switch diode. A control voltage is applied to the cathode of the first switch diode so as to change the tra... | 04/05/2005 |
| 6490441 | Tuning circuit device with built-in band pass integrated on semiconductor substrate together with PLL circuit An analog tuning circuit, a phase locked loop and a controller form a semiconductor integrated tuning device, and the analog tuning circuit has a variable band pass filter between a mixer and an amplifier so as to match an intermediate frequency signal to... | 12/03/2002 |
| 6438183 | Digital audio broadcast receiver and tuning method thereof A digital audio broadcast receiver is tuned by performing a sliding correlation on data demodulated from a phase reference symbol, correlating the demodulated data with known data at negative carrier numbers and, separately, with known data at positive nu... | 08/20/2002 |
| 6243570 | Radio receiver capable of temperature adjustment to tuning frequency of RF tuning circuit A variation in tuning frequency of an RF tuning circuit due to temperature changes in a radio receiver is prevented. A tuning frequency of an RF tuning circuit results from a coil (L) and a varicap diode that constitute the RF tuning circuit. A capacitanc... | 06/05/2001 |
| 6081700 | Radio having a self-tuning antenna and method thereof A radio (100) includes a receiver circuitry (106) for use in conjunction with a tunable antenna (101). The radio includes a controller (122) which may be a digital signal processor. The controller (122) controls various radio functions including tuning of... | 06/27/2000 |
| 6064866 | Switchable 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 |
| 6021322 | AM radio receiver In an AM radio receiver, a radio-frequency tuning circuit comprises a tuning coil, and variable capacitance diode elements connected to the tuning coil; a local oscillator circuit comprises an oscillator coil, a variable capacitance diode element connecte... | 02/01/2000 |
| 5978663 | Antenna 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 |
| 5715531 | Synchronous tracking filter circuit for a broadcast satellite tuner A synchronous tracking filter circuit for use in a broadcast satellite tuner that comprises four varactors and a strip-shaped inductor plate or pcb-printed strip line which produces a resonant frequency. The circuit is used in a doubly tuned resonant circ... | 02/03/1998 |
| 5678211 | Television tuning apparatus The invention concerns an arrangement including a microprocessor controller, PROM memory, and a digital to analog converter (DAC) arrangement for generating a plurality of control voltages for trimming respective ones of a plurality of varactor controlled... | 10/14/1997 |
| 5678212 | Electronic tuning circuit for an AM receiver An electronic tuning circuit for an AM radio receiver in which a signal of a specific frequency is selected from the input signal from an antenna is provided, this tuning circuit having a tuning transformer with a first winding and a second winding, the n... | 10/14/1997 |
| 5548821 | Adaptive 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 |
| 5438699 | Adaptive 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 |
| 5428829 | Method 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 |
| 5404587 | AFC circuit and IC of the same adapted for lower heterodyne conversion and upper heterodyne conversion An automatic frequency control circuit comprises a variable reactance element connected to a resonance circuit of a local oscillation circuit of an FM receiver, an inverting amplifier to which a demodulation output of an FM demodulation circuit of the FM ... | 04/04/1995 |
| 5301358 | Automatic antenna tuning 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 signal is applied to a variable tuning element in the match... | 04/05/1994 |
| 5263183 | Radio antenna tuning circuit The present invention provides an antenna or preselector tuning method and circuit that tunes an antenna or preselector in a very short period of time. The circuit of the present invention does not rely on measuring the magnitude of the signal strength at... | 11/16/1993 |
| 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 varactor used in the receiver and receiving the same tuning volt... | 01/08/1991 |
| 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, between signal ground and a gate electrode of a field-effect... | 05/01/1990 |
