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| Number | Title | Issue Date |
| 7444122 | Communications system with variable load and related method A mobile system has a frequency synthesizer and an amplifier module coupled to the frequency synthesizer. The frequency synthesizer is controlled by frequency division data to generate a tuning signal with a frequency corresponding to a reference signal and the freq... | 10/28/2008 |
| 7433657 | Apparatus and method for dynamically clocking a loop filter in a digital communications device A transmitter has a signal generator, an amplifier, a detection circuit, a comparison circuit, a loop filter, and an adjustable clock. The signal generator produces a signal. The signal is produced with a first frequency characteristic and contains frequency-related... | 10/07/2008 |
| 7415272 | Method for improving data throughput in wireless networks with schedulable interruptions Data throughput functionality is improved in a network which supports high data rate applications and additional applications within a single receiver. Guidelines for tuning the receiver at variable time periods to avoid timeouts and fill radio link holes which resu... | 08/19/2008 |
| 7343145 | Radio control system for models In conventional radio controlled models, a receive frequency is changed with a changeover switch mounted in a receiver body. In the present invention, a frequency switching scheme, employing a radio system in which a transmitter switches the receive frequency, is pr... | 03/11/2008 |
| 7333779 | PLL circuit and radio communication terminal apparatus using the same In a PLL circuit, the number of LPFs is reduced to one to reduce mounting area and pin number, and to simplify design. In one embodiment, the PLL circuit includes a variable-gain phase comparator, a mixer, an LPF, VCOs, couplers, and a control circuit to controlling... | 02/19/2008 |
| 7324788 | RF integrated circuit comprising a frequency synthesizer not very sensitive to injection locking The present invention relates to an RF integrated circuit comprising a frequency synthesizer and a QAM modulator for modulating a baseband signal of frequency FBB, the frequency synthesizer supplying to the QAM modulator an output signal of frequency F... | 01/29/2008 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7277727 | System and method for processing a signal A system and method for receiving a communication signal includes a timing source that generates a stable timing signal and a stabilized local oscillator that receives the stable timing signal and uses the stable timing signal as an input to generate a stabilized os... | 10/02/2007 |
| 7274913 | Transceiver system and method of using same A chip comprises and operational section and an input/output section. The operational section includes a controller. The input/output (I/O) section is coupled to the operational section. The I/O section comprises a transformer and a switching device. The transformer... | 09/25/2007 |
| 7263336 | Device, system and method to provide different bias voltages and common tuning voltage In some embodiments of the present invention, multiple voltage controlled capacitor branches may be employed in a tuning circuit. Each of the multiple voltage controlled capacitors branches may be set to somewhat apart resonance frequency so that a composite resonan... | 08/28/2007 |
| 7224948 | Transmitter and radio communication terminal using the same There are provided a transmitter and a wireless communication terminal apparatus using the same for solving a problem of undesired spurs due to harmonics of an output signal of a frequency synthesizer, and further solving a problem of the undesired spurs occurring w... | 05/29/2007 |
| 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 |
| 7190933 | Method 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 |
| 7177640 | Method of scanning channel of digital television A method of scanning channels in a digital television including (a) setting a starting frequency; (b) searching for a first available digital channel by searching a search frequency that is the starting frequency; adding a predetermined scan step to said search freq... | 02/13/2007 |
| 7116706 | Single oscillator transceiver frequency plan A frequency plan is provided for particular use in a transceiver. Advantageously, a single oscillator may be used to generate desired frequency signals. One or more power splitters receive the signal and equally divide the signal into first and second signals having... | 10/03/2006 |
| 7107024 | FM modulator output control during turn on The present invention provides a system and a method to prevent undesired sounds during FM modulator turn on. The system includes an RF attenuator circuit, a delay switch circuit, an RF ramp up circuit, and audio ramp up circuit. The RF attenuator circuit significan... | 09/12/2006 |
| 7071792 | Method and apparatus for impedance matching in an amplifier using lumped and distributed inductance An impedance matching circuit (140) includes a capacitive element (C1, 220), having a capacitance C, coupled in parallel with an output node (215) of the matching circuit, and an inductor (L1, 225) coupled in series ... | 07/04/2006 |
| 7058360 | Method and system for stabilizing the performance variation of a radio frequency device A method for stabilizing the performance variation of a primary radio frequency (RF) device is provided that includes providing a secondary RF device. An output signal is generated with the secondary RF device. The output signal is provided to a feedback circuit. A ... | 06/06/2006 |
| 7035603 | Wireless transmitter A wireless transmitter is proposed. First, a ROM having a lookup table therein is provided. The lookup table is used to store a plurality of IF modulation signals so that a state machine can select a corresponding IF modulation signal from the lookup table of the RO... | 04/25/2006 |
| 7035542 | All-optical high bit-rate multiplexer The present invention propose to use an optical multiplexer associated with an optical clock as a wavelength converter. Each RZ coded tributary will be carried by a single wavelength (channel) passively interleaved with the others without interferometric interaction... | 04/25/2006 |
| 7031675 | FM transmitter An FM transmitter that can control start/idle of each of such devices as a buffer amplifier without using a sample-and-hold circuit for moving a PLL into open loop control, wherein a controller that controls a charging pump in the PLL to start/idle the FM modulation... | 04/18/2006 |
| 7031672 | Direct conversion transmitter system and method with quadrature balancing and low LO feed through A system and method are provided for communicating a radio frequency (RF) signal. In use, a baseband signal is mixed with a plurality of oscillator signals with different phases in an interleaving manner. The mixed baseband signal is then communicated as an RF signa... | 04/18/2006 |
| 7024167 | Method for amplitude modulation of a radio frequency signal, and device therefor The invention provides a method and a device for amplitude modulation of a radio frequency signal using a variable-gain radio frequency power amplifier, for automatic control of the amplifier output signal by generating an error signal between an amplitude modulatio... | 04/04/2006 |
| 7012564 | Method and apparatus for adjusting a measurement cycle in a satellite positioning system signal receiver Method and apparatus for adjusting a measurement cycle in a satellite signal receiver is described. In one example, a notification is received at the satellite signal receiver that is indicative of at least one of a route-critical event and a motion-change event. A ... | 03/14/2006 |
| 6996165 | Single oscillator transceiver frequency plan A frequency plan is provided for particular use in a transceiver. Advantageously, a single oscillator may be used to generate desired frequency signal. One or more power splitters receive the signal and equally divide the signal into first and second signals having ... | 02/07/2006 |
| 6973293 | Apparatus and method for compensating for the offset of a mixer An apparatus and a method compare the output signal of a mixer in a detector with one of two input signals of the mixer, in order to compensate for the offset of a mixer or modulator. The detector determines the sign of the offset of the mixer. A compensation value ... | 12/06/2005 |
| 6967693 | Television signal transmitter including a bandpass filter without tracking error A television signal transmitter includes a mixer in which an intermediate-frequency television signal is frequency-converted into a television signal on a channel used for transmission in a predetermined frequency range, a bandpass filter to which the television sig... | 11/22/2005 |
| 6968162 | Satellite communication transmission control system and small aperture terminal A satellite communication transmission control system includes one central station, a plurality of small aperture terminals, and one communication satellite serving as a repeater for the central and aperture terminals. This system performs communication via a freque... | 11/22/2005 |
| 6922402 | Mutual frequency locking across a link Transmitter frequency locking across a full duplex communications link. An offset in one transmitter results in an offset at the corresponding receiver. That receiver offset shifts its transmitter in a corresponding manner, causing a correcting offset in the first r... | 07/26/2005 |
| 6914987 | Audio amplifier with voltage limiting in response to spectral content Audio signals are reproduced with consistent perception of total harmonic distortion even with varying spectral content of a particular audio signal without separately limiting different frequency bands within the audio signal. A distortion threshold representative ... | 07/05/2005 |
| 6885256 | Input circuit for an HF-transmitting component An input circuit for an HF-transmitting component 1 of a battery-operated device for the transmission of a data signal aims to reduce the power consumption. For that purpose the fundamental frequency of a reference oscillator 5 is modulated with the di... | 04/26/2005 |
| 6861900 | Fast timing acquisition for multiple radio terminals A method and apparatus are provided that performs timing acquisition for multiple radio terminals. According to one aspect of the present invention the invention includes receiving a sequence of symbols modulated onto a carrier frequency over a channel and demodulat... | 03/01/2005 |
| 6829469 | Method and a device for producing a signal A method for producing an output signal (42) with a specific frequency from an input signal (40) received, the frequency of which changes quickly in steps of the size of an input frequency resolution or a multiple of the input frequency resolution, on ... | 12/07/2004 |
| 6823178 | High-speed point-to-point modem-less microwave radio frequency link using direct frequency modulation A point-to-point microwave radio link that operates in a Frequency Division Duplex (FDD) mode using direct digital modulation with a Continuous Phase-Frequency Shift Keyed (CP-FSK) scheme. The transmit signal is generated by a circuit that uses a Voltage-Control Osc... | 11/23/2004 |
| 6751447 | Adaptive digital pre-distortion circuit using output reference signal and method of operation There is disclosed a pre-distortion correction circuit for use in an RF transmitter having a transmit path for receiving and amplifying an RF input signal. The pre-distortion correction circuit modifies distortion in the RF output signal caused by an RF power amplif... | 06/15/2004 |
| 6603958 | Method and apparatus for a carrier frequency control in a wireless communication system The invention provides a frequency control method and apparatus for efficiently controlling in a wireless system the carrier frequency of a received signal transmitted over a radio link to counteract carrier frequency drifts in the received signal and hen... | 08/05/2003 |
| 6600516 | Digital RF transmitter system employing both digital pre-correction and analog pre-correction A digital radio frequency transmitter system having an input circuit for receiving digital signals to be amplified and transmitted. A digital-to-analog converter converts the digital signals into analog signals. A series circuit is provided including a ra... | 07/29/2003 |
| 6487398 | Low noise architecture for a direct conversion transmitter A low noise direct conversion transmitter architecture without a post-PA filter is described. A high power/low noise differential LO (110), controlled by a near unity divide ratio PLL (112) for re-modulation protection, is coupled a polyphase quadrature g... | 11/26/2002 |
| 6384772 | Wideband phase locking of low offset frequency sources A linear phase detector circuit enables locking of two frequency sources which can operate in the range of 10 GHz with a minimal frequency offset, such as from 0 Hz to 50 KHz. With the frequency sources operating at frequencies F1 and F2 with an offset F2... | 05/07/2002 |
| 6349215 | Synchronization of broadcast facilities via microwave tone Interference effects between television transmitters for amplitude modulated or digital video and operating on a common allocated channel or frequency is avoided while discrimination is improved by synchronizing carrier signals for a plurality of transmit... | 02/19/2002 |
