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| Number | Title | Issue Date |
| 7925232 | Reduced cost mobile satellite antenna system using a plurality of satellite transponders A system for utilizing circular polarized signals to perform satellite communication to mobile users. The satellite includes transponders, each transponder providing linearly polarized signals and at least two orthogonal linear polarized transponders. A plurality of... | 04/12/2011 |
| 7796964 | Intermediate-frequency type radio signal receiver A radio signal receiver includes an input for receiving an input signal having an input carrier frequency modulated by a payload signal to be detected. A frequency converter changes the carrier frequency of the input signal and produces an intermediate signal that i... | 09/14/2010 |
| 7634242 | Systems and methods for filter center frequency location A system for implementing a tuner comprising a Radio Frequency (RF) circuit, a filter disposed in a signal path in said RF circuit, a first negative resistance unit in communication with said filter adapted to cancel one or more resistive elements in said filter, a ... | 12/15/2009 |
| 7567786 | High-dynamic-range ultra wide band transceiver An UWB Transceiver for Multi-Band OFDM communication including an antenna switch (342), a receive front end and down-converter (303), an up-converter and power amplifier (305), and a frequency synthesizer (211). The transceiver achieves h... | 07/28/2009 |
| 7418248 | Signal reception device, signal transmission device, radio communication system, and signal reception method A signal reception device is disclosed that is able to improve interference cancellation capabilities even when signals having different center frequencies exist on the same frequency band. The signal reception device includes an interference suppression unit to gen... | 08/26/2008 |
| 7406301 | Modulation-demodulation apparatus and wireless communication apparatus A modulation-demodulation apparatus of a relatively simple arrangement is able to prevent a bad influence caused due to interference between two local oscillators and a portable wireless communication apparatus uses this modulation-demodulation apparatus. In a modul... | 07/29/2008 |
| 7379722 | Frequency allocation using a single VCO An apparatus and method to use a single voltage controlled oscillator (VCO) to generate frequencies to cover multiple frequency bands. The single VCO generates local oscillator signals for more than one frequency band of a communication standard or protocol, such as... | 05/27/2008 |
| 7343144 | Frequency synthesizer using PLL architecture for wireless frequency allocation An apparatus method to provide a frequency synthesizer using a phase locked loop in a communication device to provide a particular frequency allocation to generate an output from the PLL. The synthesizer includes a phase locked loop (PLL) circuit that has a feedback... | 03/11/2008 |
| 7333573 | Radio communication apparatus and method having automatic frequency control function A method for use in an apparatus for frequency error detection and automatic frequency control detects a frequency error by utilizing known symbols other than a data signal contained in an input signal. At least two known symbols located at positions somewhat distan... | 02/19/2008 |
| 7327406 | Methods and apparatus for implementing a receiver on a monolithic integrated circuit A monolithic integrated circuit includes a tuner and a SAW filter function. The tuner receives a radio frequency (RF) television signal that has a range of fundamental frequencies from 55 mega hertz (Mhz) to 880 Mhz. The tuner down converts the RF television signal ... | 02/05/2008 |
| 7292831 | Radio communicate method and system A transmitter 1 transmits from a transmission antenna 7 a mixture signal containing a radio-frequency (RF)-band modulated signal, and a portion of power of a local oscillation signal used for frequency conversion. Meanwhile, a receiver 8 detects... | 11/06/2007 |
| 7289779 | Method for calibrating the frequency of an RF oscillator in a mobile part of a mobile communications device A method is provided for calibrating the frequency of an RF oscillator in a mobile part of a mobile communications device when the mobile part is first switched on, wherein the method includes the steps of: sampling a modulated carrier that is transmitted by a base ... | 10/30/2007 |
| 7280163 | Direct conversion tuner capable of receiving digital television signals in UHF band and VHF band A direct conversion tuner includes mixers that orthogonally convert a digital television signal located in high channels of the VHF band and a digital television signal located in a frequency range of 470 MHz to 608 MHz in the UHF band directly into baseband signals... | 10/09/2007 |
| 7274274 | Integrable acoustic resonator and method for integrating such resonator An acoustic resonator circuit to be integrated into a semiconductor product including: a resonator comprising first and second resonant frequencies; an inductive resistor tuned to said second resonant frequency so as to cancel the latter and to allow tuning of the r... | 09/25/2007 |
| 7269394 | Frequency offset compensation for communication systems In communications between a pair of stations using modulated carrier signals, a first station estimates the carrier frequency offset with respect to the second station and transmits signals that are responsive to the estimated carrier frequency offset. The first sta... | 09/11/2007 |
| 7263339 | Tuner comprising a voltage converter The invention relates to a tuner for converting a radio frequency signal into an intermediate frequency signal, said tuner comprising a voltage converter supplying a control signal, a mixer associated with an oscillator which is voltage-controlled by said control si... | 08/28/2007 |
| 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 |
| 7251298 | Receiver architecture eliminating static and dynamic DC offset errors The present invention provides a receiver frontend that eliminates static and dynamic DC errors and has improved second order intermodulation distortion (IMD2) performance. The receiver frontend includes a first mixer that multiplies a received signal and a first lo... | 07/31/2007 |
| 7248126 | Temperature correction device and voltage control oscillation device A temperature correcting apparatus divides an actually measured waveform of correcting voltages, which are required at each of different temperatures, by a minimum resolution of D/A conversion; obtains voltage digital values representing voltage values at individual... | 07/24/2007 |
| 7242910 | Self-calibrating radio A self-calibrating radio is described. In one exemplary implementation, a radio signal from its local voltage controlled oscillator. The calibration system automatically calibrates the radio by: (i) receiving a reference signal having a calibrated reference frequenc... | 07/10/2007 |
| 7242259 | Active backscatter transponder, communication system comprising the same and method for transmitting data by way of such an active backscatter transponder The invention relates to a device, especially an active backscatter transponder, for generating an oscillator signal based on a base signal. It comprises an oscillator for actively constructing the oscillator signal by oscillations, an input for the base signal and ... | 07/10/2007 |
| 7224722 | Direct conversion RF transceiver with automatic frequency control A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to wideband RF signals prior to transmission without requiring conversion to an intermed... | 05/29/2007 |
| 7218181 | Integrable amplitude-locked loop including an acoustic resonator An amplitude-locked loop (ALL) includes: a comparator circuit having a first input, a second input and an output, said first input receiving an electric reference signal; a loop filter having an input connected to said output of said comparator circuit and having an... | 05/15/2007 |
| 7218685 | Direct conversion receiver To solve such a problem of a conventional direct conversion receiver that an image rejection ratio is insufficient owing to analog processing employed to reject an image, the present invention provides such a direct conversion receiver that the image can be rejected... | 05/15/2007 |
| 7218901 | Automatic frequency control of multiple channels An architecture for providing high-speed access over frequency-division multiplexed (FDM) channels allows transmission of ethernet frames and/or other data across a cable transmission network or other form of FDM transport. The architecture involves downstream and u... | 05/15/2007 |
| 7203475 | Multiple rate local oscillation generator and applications thereof A local oscillation generator includes a clock circuit, a first divide module, a first mixing module, a second divide module, and a second mixing module. The clock circuit is operably coupled to generate a first clock signal. The first divide module is operably coup... | 04/10/2007 |
| 7197091 | Direct conversion receiver with direct current offset correction circuitry A direct conversion circuit that includes an in-phase and quadrature-phase feedback path that reduces Direct Current (DC) offset. Each feedback path includes a compensating mixer that generates an error correction voltage that is passed through a loop gain circuit a... | 03/27/2007 |
| 7187240 | Integrated electronic circuit comprising a tunable resonator An integrated electronic circuit comprises at least first and second variable resonator elements that can be tuned by means of an electric signal (Vtune) and that are arranged on the same silicon substrate, and that are respectively integrated into a Mast... | 03/06/2007 |
| 7184738 | Radio apparatus In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determine... | 02/27/2007 |
| 7177602 | Electronic devices having automatic frequency control systems and methods and computer program products for operating the same An automatic frequency control (AFC) system in an electronic device is operated by using an AFC-algorithm component to determine a frequency error corresponding to a difference between a frequency of a signal output from a signal generator and a received signal freq... | 02/13/2007 |
| 7171181 | Method for achieving immediate and accurate automatic frequency tuning An automatic frequency tuning (AFT) system which can effect immediate and accurate automatic frequency tuning of the local oscillator (LO) of a receiver, in order to achieve a stable intermediate frequency (IF) signal while reducing the power consumption and the cos... | 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 |
| 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 |
| 7139541 | Radio transmission device and method for aligning parameters thereof The application discloses a radio transmission device for receiving/transmitting of radio packets, comprising: a reception means (34) connected to a mixing means (4) via a transmit/receive switch (32) and an amplifying means (30), said mi... | 11/21/2006 |
| 7139546 | Up-conversion of a down-converted baseband signal in a direct conversion architecture without the baseband signal passing through active elements A direct conversion circuit that not only down-converts the received modulated signal using a down-converting mixer into a baseband signal, but also, after performing a passive low pass filtering to remove higher-order components, performs up-conversion of the baseb... | 11/21/2006 |
| 7139530 | Method and apparatus for calibrating a reference oscillator A method and apparatus for calibrating a reference oscillator and use of a calibrated reference oscillator is disclosed. To gain cost reduction advantages, a less accurate reference oscillator is utilized in a wireless communication device. The cost benefit is gaine... | 11/21/2006 |
| 7136433 | Frequency offset cancellation circuit for data determination in FM wireless communications A demodulating semiconductor integrated circuit device used in a wireless communication system of an FM-modulation scheme, wherein a circuit for canceling a frequency offset is made of a digital circuit, so as to make a high-accuracy decision as to received data and... | 11/14/2006 |
| 7130607 | Adjusting a programmable mixer A method for adjusting a programmable mixer of a local oscillation module to reduce local oscillation leakage begins by determining at least one of: DC offset of an input signal of the programmable mixer and process mismatches between a first mixing stage and a seco... | 10/31/2006 |
| 7123892 | Architecture for an AM/FM digital intermediate frequency radio An AM/FM DIF radio has an IF to audio converter that provides an audio signal from an IF signal responsive to a clock signal. During the processing of the IF signal, a spurious signal is intentionally generated. The spurious signal is based on the predetermined offs... | 10/17/2006 |
| 7113760 | Direct conversion receiver for amplitude modulated signals using linear/log filtering A receiver circuit that includes a direct conversion receiver that receives a modulated signal, and generates an in-phase differential signal and a quadrature-phase differential signal. The receiver circuit includes an in-phase branch that processes the in-phase dif... | 09/26/2006 |
