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| Number | Title | Issue Date |
| 8121569 | Frequency generation techniques Techniques involving the generation of signals at particular frequencies are disclosed. For instance, an apparatus may include an oscillator module, a synthesizer module, and a control module. The oscillator module produces an oscillator signal having a first freque... | 02/21/2012 |
| 7805118 | Satellite receiving method and system A satellite receiving system (200, 300) and a method for adjusting a satellite receiving system include an input (113); a first oscillator (106) with theoretical frequency (FOSC1) and real frequency (FOSC1′), a first freq... | 09/28/2010 |
| 7424278 | Low IF mixer with improved selectivity performance A low IF mixer and method for down-converting a signal at a desired frequency are disclosed with improved selectivity performance. The energy of sidebands on each side of the desired frequency is evaluated; and a local oscillator frequency is selected based on the e... | 09/09/2008 |
| 7395037 | Control system for controlling an output signal power level of a wireless transmitter A method and system for controlling an output signal power level of a wireless transmitter can be created by detecting the signal power level of the transmitter with a detector, selectively attenuating the output signal power level with an attenuator having variable... | 07/01/2008 |
| 7389091 | High-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 |
| 7349691 | System 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 |
| 7336742 | Frequency error correction device and OFDM receiver with the device A frequency error correction device for an OFDM receiver is proposed. The receiver receives an OFDM signal with a preamble section and a payload section including pilot carriers. The frequency error correction device includes a first frequency correction unit for co... | 02/26/2008 |
| 7324789 | PLL frequency synthesizer architecture for low phase noise and reference spurs A frequency synthesizer for use in a transceiver generates a relatively high reference frequency with fine frequency resolution and low in-band phase noise by using a digital processor to generate a digital reference signal at a finely-tuned reference frequency. A D... | 01/29/2008 |
| 7305219 | Portable radio terminal and AFC control method A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling the oscillation frequency of an oscillator includes a unit for intermittently performing AFC operation, and a unit for shortening an AFC operation stop period whe... | 12/04/2007 |
| 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 |
| 7277457 | Sync bursts for frequency offset compensation A method (500) and system for compensation of frequency offset between a first transceiver (102) and a second transceiver (104) in wireless communication are disclosed. The compensation of the frequency offset between two or more transceivers ( | 10/02/2007 |
| 7272369 | Method for performing a frequency correction of a wireless device Frequency correction of a radio module. An estimate is made of the amount of frequency correction needed while applying an original reference frequency. If the frequency correction needed is greater than a pre-determined amount, a large shift frequency correction is... | 09/18/2007 |
| 7236755 | Broadcast wave receiving apparatus Herein disclosed is a broadcast wave receiving apparatus, comprising: first and second tuning circuits each having a resonance frequency; first controlling means for controlling one of the first and second tuning circuits to ensure that the resonance frequency of on... | 06/26/2007 |
| 7236760 | Tuner for reception of a broadband radio frequency signal A tuner is provided for selecting a channel from a broadband radio frequency input signal containing a plurality of channels, such as a terrestrial broadcast signal. The tuner has an input which supplies the broadband signal to a filter. The output of the filter is ... | 06/26/2007 |
| 7218179 | Methods and apparatus for calibrating gm-Z In one embodiment of the present invention, an apparatus includes a plurality of gain stages each having a gain greater than one, and which are coupled to create a positive feedback at an oscillation frequency. The gain stages may be formed of transconductance gain ... | 05/15/2007 |
| 7215935 | Segmented CDMA searching Techniques for segmented CDMA searching are disclosed. In one aspect, a searcher comprises a plurality of storage elements selectable for performing a plurality of segmentable search tasks, each storage element operable for storage of and access to state information... | 05/08/2007 |
| 7209716 | Radio communication system, radio station, and radio communication method A radio communication system comprises: a radio receiver including an interference canceller configured to generate a replica of a received signal and remove an interference signal from the received signal, and a frequency offset estimator configured to estimate a c... | 04/24/2007 |
| 7190753 | Method and apparatus for temporally correcting a data signal A data signal is detected and compared with a reference value. A displacement time is determined as a function of the difference between the reference value and the signal level of the data signal. The data signal is buffer-stored and output in a manner that is temp... | 03/13/2007 |
| 7184725 | Pole switch down converter with symmetric resonator A pole switch down-converter with symmetric resonator which reduce the non resonating phase to approximately half of the RF carrier period of the modulated signal is proposed. The down-converter comprises a first and second λ/2 resonator for collecting RF energy, w... | 02/27/2007 |
| 7177606 | Control system for controlling an output signal power level of a wireless transmitter A method and system for controlling an output signal power level of a wireless transmitter can be created by detecting the signal power level of the transmitter with a detector, selectively attenuating the output signal power level with an attenuator having variable... | 02/13/2007 |
| 7155189 | AM receiver An AM receiver with at least one IF filter with a fixed IF bandwidth comprises at least one downconversion stage (3, 4, 5) to shift the signal input thereto into an IF range (IF1) having a variable oscillation frequency (fLO1) which is adjus... | 12/26/2006 |
| 7155183 | Method and apparatus for adjusting reference oscillator frequency in a mobile wireless device A method and apparatus for using a conventional oscillator in a cellular telephone transceiver as a source of a reference signal for a GPS receiver. In one embodiment, the method comprises using a voltage-controlled oscillator (“VCXO”) within a cellular telephon... | 12/26/2006 |
| 7132835 | PLL with built-in filter-capacitor leakage-tester with current pump and comparator A filter capacitor within a phase-locked loop (PLL) can be tested using a built-in test circuit. The PLL's charge pump is deactivated while a test-current source is activated to supply a test current to the PLL filter capacitor. When the test current is larger than ... | 11/07/2006 |
| 7120390 | BLUETOOTH smart offset compensation An offset history table is implemented and maintained in a BLUETOOTH device and is used to pre-seed an expected frequency offset of a received signal from another BLUETOOTH device. The disclosed offset history table includes one entry for each piconet device in a pa... | 10/10/2006 |
| 7099642 | Method and apparatus for matching receiver carrier frequency A carrier recovery method and apparatus using multiple stages of carrier frequency recovery are disclosed. A receiver uses multiple frequency generation sources to generate carrier signals used to downconvert a received signal. An analog frequency reference having a... | 08/29/2006 |
| 7088974 | Mobile station capable of performing automatic frequency control based on correspondence of frequency error and TCXO control voltage to base station A mobile station is disclosed for performing an automatic frequency control based on a correspondence of a frequency error and TCXO control voltage to a base station. A plurality of frequency error measuring units each measure a frequency error between an internal c... | 08/08/2006 |
| 7072631 | Mobile communication terminal and method of calibrating frequency in the same A mobile communication terminal includes (a) a first unit for calibrating a frequency, (b) a global positioning system (GPS) module, and (c) a processor which electrically connects the first unit and the global positioning system module to each other. The first unit... | 07/04/2006 |
| 7027787 | Automatic frequency control system, operation control method thereof and mobile communication device using the same In a mobile communication device, communication can be resumed upon next communication without causing problem even when an AFC control signal becomes abnormal upon interruption of communication. Locked state and unlocked state of an AFC portion is monitored by an A... | 04/11/2006 |
| 6996156 | CDMA receiver capable of estimation of frequency offset in high precision A receiver for a code division multiple access system includes a pilot symbol producing section, a frequency offset estimating section and a local signal generating section. The pilot symbol producing section produces pilot symbols of complex vector expression from ... | 02/07/2006 |
| 6983128 | Radio control transmitter and receiver Radio control is used for different types of models, e.g. aircraft, cars and boats. Commonly, a number of different radio channels are allocated in a frequency band for use in radio control. If a modeller finds her or his intended channel in use, s/he can either wai... | 01/03/2006 |
| 6980775 | Automatic frequency control (AFC) system and method using an adaptive threshold to improve accuracy of the direct current (DC) component calculation for a received signal A radio device requires a tunable transceiver such that the transceiver can be accurately set to a desired frequency. When a signal with known frequency accuracy is being received, an offset detector can determine the frequency offset generated by the transceiver du... | 12/27/2005 |
| 6978125 | Methods and apparatus for tuning pre-selection filters in radio receivers A tuning arrangement in a radio receiver includes a front-end circuit having a tunable band-pass filter that is capable of tunably selecting channels within at least one frequency band of an RF signal. A noise source coupled to an input of the tunable band-pass filt... | 12/20/2005 |
| 6975847 | Filtering of a receive frequency band The invention relates to the filtering of a subfrequency band out of a receive frequency band, in which a carrier frequency for prefiltering the receive frequency band and an intermediate frequency for demodulating the frequency band filtered out during the prefilte... | 12/13/2005 |
| 6917390 | Intermediate-frequency coupled-circuit for television tuner An intermediate-frequency (IF) coupled-circuit for a television tuner is provided, which is connected between an IF amplifying stage and a video-signal-selection filter, and which comprises a parallel circuit having a second capacitor connected in parallel to a seri... | 07/12/2005 |
| 6888580 | Integrated single and dual television tuner having improved fine tuning Improved television tuning circuits are disclosed. An example tuning circuit includes a fraction-N frequency synthesizer facilitating fine tuning. This tuning circuit may be formed using relatively few independent oscillators. The tuning circuit lends itself to the ... | 05/03/2005 |
| 6816716 | Radio frequency control for communication systems A system and operation of the system for improvement of transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit, received signals are down-converted into comp... | 11/09/2004 |
| 6771943 | Image rejection Radio receivers are known in the art. A conventional receiver requires external components for RF/image selectivity, IF selectivity and demodulation. Other solutions are, for example, a number of correction algorithms, which is an expensive solution. Instead, the ... | 08/03/2004 |
| 6771937 | Frequency-stabilized transmitting/receiving configuration A circuit configuration has a radio-frequency section with a receiving mixing stage, and has a signal processing circuit with an A/D converter, a digital filter and a frequency estimator. The frequency estimator continuously determines a first frequency correction c... | 08/03/2004 |
| 6748199 | Portable telephone apparatus and stablly supplying method of reference frequency A portable telephone apparatus includes a reference frequency generating section capable of suitably changing frequency accuracy of an output signal in accordance with an input control voltage, and a high-accurate reference frequency generating section having accura... | 06/08/2004 |
| 6731917 | Method and apparatus for minimizing image power in the output of a receiver circuit A receiver system (10) includes a first stage of modulation (46, 51) which modulates a radio-frequency input signal (17), and a second stage of modulation (56, 61, 66, 71) which modulates outputs from the first stage. Combining circuits (... | 05/04/2004 |
