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| Number | Title | Issue Date |
| 7979038 | PLL modulation circuit, radio transmission device, and radio communication device Provided are a PLL modulation circuit, a radio transmission device, and a radio communication device capable of maintaining a modulation accuracy for modulation of a wide band. The PLL modulation circuit (100) includes: a PLL unit (110), first modulati... | 07/12/2011 |
| 7920835 | FM transmitter An FM transmitter with improved degree of freedom in parts selection comprises: an oscillator connected with a crystal oscillator; a clock generating circuit uses a signal formed by frequency-dividing an oscillator output as a reference frequency, and which generate... | 04/05/2011 |
| 7558538 | Quadrature sub-harmonic frequency up-converter A method and apparatus for frequency up-converting a baseband signal to radio frequency (RF) in two steps using the two quadrature components of a single local oscillator signal. In a first stage, the baseband signal is split into two parts in quadrature with each o... | 07/07/2009 |
| 7546095 | Frequency multiplier It is intended to provide a frequency multiplier capable of switching as appropriate among frequency signals having frequencies obtained by multiplying prescribed multiplication numbers with low current consumption and a simple circuit configuration in effectively u... | 06/09/2009 |
| 7409192 | Method and apparatus for frequency synthesis in direct-conversion transmitters A method and apparatus for direct-conversion transmission generates a first frequency signal that is non-harmonically related to a transmit frequency signal, divides the first frequency signal to obtain a mixing frequency signal, divides the first frequency signal t... | 08/05/2008 |
| 7403570 | Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver, decoded and compared to known values to provide synchronization, framin... | 07/22/2008 |
| 7403079 | Frequency modulator and frequency modulation method A frequency modulation method is provided in which the frequency of a carrier signal is modulated on the basis of the frequency of a modulation signal, and in which the modulation signal is integrated. The carrier signal is integrated, and a differential signal is f... | 07/22/2008 |
| 7394754 | System and method for transmitting data in a multiple-branch transmitter-diversity orthogonal frequency-division multiplexing (OFDM) system A system and method for transmitting data in multiple-branch transmitter-diversity OFDM systems is presented. In one embodiment, an approach is taken where an inverse Fourier transform (IFT) is performed on data prior to encoding the data for transmission in the mul... | 07/01/2008 |
| 7379759 | MIMO wireless communication system and wireless communication apparatuses A MIMO wireless communication system and wireless communication apparatuses are disclosed that increase the practically usable communication channel capacity in the Shannon channel capacity that determines the ratio of maximum signal transmission speed to frequency.... | 05/27/2008 |
| 7378918 | Two-point modulation type phase modulation apparatus, polar modulation transmission apparatus, wireless transmission apparatus and wireless communication apparatus There provides a two-point modulation phase modulation apparatus capable of obtaining an RF phase modulation signal of superior modulation precision with low power consumption and a simple configuration even in the event of inputting a wide band baseband modulation ... | 05/27/2008 |
| 7376399 | Weighted mixing circuitry for quadrature processing in communication systems Mixing circuitry for quadrature processing in communication systems and related methods are disclosed. The weighted mixing circuitry allows for arbitrary dividers to be utilized in generating the mixing signals for quadrature processing and thereby provides a signif... | 05/20/2008 |
| 7366485 | Multimode wireless transmitter and a portable wireless device using the same The circuits of a multimode wireless transmitter are complex and large, and thus difficult to incorporate in a portable wireless device. This problem is solved for a multimode wireless transmitter by enabling the first frequency mode circuit and the second frequency... | 04/29/2008 |
| 7363013 | Phase lock loop applying in wireless communication system and method thereof A phase lock loop receives a baseband signal which has an input frequency, and modulating the baseband signal to be a corresponding RF signal which has a predetermined transmission frequency for transmitting. The phase lock loop comprises a programmable divider, a m... | 04/22/2008 |
| 7340011 | Method of frequency multiplication in a radiocommunications apparatus Radiofrequency apparatus and method including at least one transmitter and/or receiver of a useful signal S0, at least one device adapted to the application of a coefficient N to the useful signal S0. The method includes modulating the useful s... | 03/04/2008 |
| 7327991 | Pulse modulation circuit Provided is a pulse modulation circuit that improves the on/off operation and improves the on/off ratio of an output power of the entire pulse modulation circuit in the switching operation. The pulse modulation circuit inputs a local oscillation wave and a DC pulse ... | 02/05/2008 |
| 7324798 | 2-order sub-harmonic frequency modulator having high carrier suppression ratio and direct conversion transmitter using the same Disclosed herein is a 2N-order sub-harmonic frequency modulator and direct conversion transmitter using the same. The direct conversion transmitter includes a digital modulation unit, a D/A conversion unit, a DC correction and low pass filter unit, a loca... | 01/29/2008 |
| 7302235 | Synchroniser A synchroniser for use in a receiver which receives signals, wherein the synchronizer provides a digital control signal, the control signal defining a plurality of different levels; controls the level provided by successive ones of the control signals, successive on... | 11/27/2007 |
| 7302011 | Quadrature frequency doubling system The frequency doubler of the present invention operates to provide an in-phase signal and a quadrature signal, each having a frequency equal to twice the frequency of a reference signal. The in-phase and quadrature signals are based on signals that are 0 degrees, 45... | 11/27/2007 |
| 7269174 | Dynamic wireless network A Dynamically Reconfigurable Dynamic Wireless Network for connecting a local area network (“LAN”) to wireless Mobile Stations. Backbone Access Points (“Backbone APs”) are physically connected to the LAN. Levels of Wireless Access Points (“Wireless APs”) ... | 09/11/2007 |
| 7263149 | Apparatus and method for generating a distributed clock signal The present invention provides a method and apparatus for synchronizing signal transfers between two clock domains, where the clock domains have a gear ratio relationship. A gear ratio means that the clocks are related by a ratio, such that each clock has a differen... | 08/28/2007 |
| 7260360 | Multi-band ZigBee transceiver supporting IEEE 802.15.4 wireless communication Disclosed herein is a multi-band ZigBee transceiver for supporting IEEE 802.15.4 wireless communications. In the multi-band ZigBee transceiver, a Multi-Mode Modem (MMM) selects any one of a European version standard using 860 MHz band, a US version standard using 92... | 08/21/2007 |
| 7259630 | Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop includes a look-up table containing predistortion values to be applied to an... | 08/21/2007 |
| 7242913 | Circuit arrangement for frequency conversion and mobile radio device with the circuit arrangement The invention is directed to a frequency conversion circuit arrangement a mobile radio containing such circuit which provide frequency conditioning with a frequency mixer. In this context, a feedback path from the output of the frequency mixer to a further input on ... | 07/10/2007 |
| 7239854 | Frequency-doubling circuit arrangement, and mobile radio having that circuit arrangement One or more aspects of the present invention are directed to a frequency-doubling circuit arrangement that doubles the frequency of a signal applied to its input, and presents that doubled frequency signal at its output. A rectifier that rectifies the input signal a... | 07/03/2007 |
| 7233625 | Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver, decoded and compared to known values to provide synchronization, framin... | 06/19/2007 |
| 7197279 | Multiprotocol RFID reader An RFID reader accessible thorough a personal computer and includes a PC card interface and a controller both operating according to clock signals from a crystal oscillator. The RFID reader further includes a linearized power amplifier modulator in a transmit path, ... | 03/27/2007 |
| 7184724 | System and method for frequency translation using an image reject mixer Frequency translation, such as frequency up conversion of a video baseband or intermediate frequency to a desired frequency division broadcast channel, is provided utilizing a single sideband or image reject mixer and filtering having relaxed selectivity requirement... | 02/27/2007 |
| 7181165 | Local wireless audio signal RF transmitter and receiver having a single downconverter without need for IF carrier A local wireless system for transmitting a modulated RF carrier audio signal from a base unit to a receiver unit is provided. The base unit has a pair of audio input connections of which are coupled to an audio source amplification device for receiving left and righ... | 02/20/2007 |
| 7181181 | Multi-band transceiver for a wireless communication system A local oscillation signal generator and a multi-band transceiver including the local oscillation signal generator are provided. The multi-band transceiver includes a fractional-N phased locked loop (PLL), a local oscillation signal generator, and a transmitter. The... | 02/20/2007 |
| 7171193 | Telecommunications interruption and disconnection apparatus and methods Embodiments of interruption-sound devices for producing an interruption sound signal in a telecommunications transmission signal comprising a signal generator circuit and a processor circuit, in accordance with the present invention. The interruption sound signals a... | 01/30/2007 |
| 7167698 | Balanced sub-harmonic mixer A wide band mixer is provided that mitigates local oscillator leakage. A LO signal is provided to a 180 degree splitter that provides a first intermediate LO signal and a second intermediate LO signal 180° out of phase from one another. Since both the first and sec... | 01/23/2007 |
| 7167693 | Scanning receiver for use in power amplifier linearization A feed forward power amplifier system and method identify active channels across a frequency band to suppress unwanted intermodulation distortion (IMD) products in a communications signal such as a single- or multi-carrier communications signal. A scanning receiver ... | 01/23/2007 |
| 7120396 | Radio transmitter architecture comprising a PLL and a delta-sigma modulator The transmitter circuit architecture is disclosed based on a phase lock loop architecture and which uses a delta-sigma modulator with 2 point modulation. In order to restrict the bandwidth of the PLL, subsidiary analogue modulation is employed, which requires aligni... | 10/10/2006 |
| 7088962 | On-chip loop filter for a PLL An on-chip loop filter includes a 1st resistor, a 1st capacitor, a 2nd capacitor, a 3rd capacitor, a 2nd resistor, and a 4th capacitor. The 1st resistor is operably coupled to receive a cha... | 08/08/2006 |
| 7035672 | MIMO wireless communication system and wireless communication apparatuses A MIMO wireless communication system and wireless communication apparatuses are disclosed that increase the practically usable communication channel capacity in the Shannon channel capacity that determines the ratio of maximum signal transmission speed to frequency.... | 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 |
| 7027786 | Carrier and clock recovery using universal frequency translation Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ... | 04/11/2006 |
| 7023273 | Architecture and implementation methods of digital predistortion circuitry A predistorter including a modulator configured for use with an RF power amplifier or in an amplifier system that combines in a data structure correction factors for amplitude and phase non-linearities in the responses of the amplifier and the modulator. Correction ... | 04/04/2006 |
| 7023897 | Transmission circuit A transmission circuit includes a baseband circuit, spreading section, multiplier, digital modulator, quadrature modulator, and antenna. The baseband circuit generates and outputs at least one transmission data constituted by first and second channel data. The sprea... | 04/04/2006 |
| 7024171 | Fractional-N frequency synthesizer with cascaded sigma-delta converters Frequency synthesizer utilizing fractional-N synthesis includes a phase detector having an input receivable of a reference frequency, a loop filter arranged to receive the signal from the phase detector, a tunable oscillator arranged to receive a tuning signal gener... | 04/04/2006 |
