Class / Patent application number | Description | Number of patent applications / Date published |
455295000 | Modulation distortion or cross talk correction or elimination | 14 |
20080214134 | System And Method For Adjacent Channel Power Detection And Dynamic Bandwidth Filter Control - A system for detecting and minimizing interference in a radio receiver includes a plurality of bandpass filters having different response characteristics, a power detector configured to compare a power output of a first bandpass filter and a second bandpass filter, and logic to cascade a third bandpass filter when the difference in power output between the power output of the first bandpass filter and the power output of the second bandpass filter exceeds a threshold amount. | 09-04-2008 |
20080280580 | IMAGE COMPENSATION FOR WIRELESS RECEIVER - A receiver ( | 11-13-2008 |
20080311875 | REDUCING INTERFERENCE BETWEEN DEVICE COMPONENTS - Systems and methods that are adapted to avoid radio frequency interference, electromagnetic interference, and/or electromechanical interference originating from modules, peripherals and interconnects of an electronic device, such as a mobile terminal, that are generating unintentional radiation (e.g. memory cards, camera flashes, data buses etc.) and coupling to the radios of the same electronic device are disclosed. The systems may include a controller unit that schedules the operation of the components to avoid concurrent operation of radios and sensitive peripheral devices which may interfere with each other during concurrent operation. | 12-18-2008 |
20090029667 | COMMUNICATION DEVICE - To propose a communication device capable of easily calibrating frequency error and obtaining position information with high accuracy. The communication device includes a frequency error detecting circuit that receives a reception signal, detects frequency error contained in the reception signal, and generates frequency error correction output, main frequency error correcting means that corrects the frequency error contained in the reception signal based on the frequency error correction output, and main correlation calculating means that performs calculation of correlation between reception output which frequency error has been corrected by the main frequency error correcting means and a pseudo random noise code, and a data processing circuit that outputs position information with respect to the radio wave source based on the output from the main correlation calculating means. | 01-29-2009 |
20090111416 | INTERMODULATION DISTURBANCE DETECTING CIRCUIT - There are provided a frequency converting circuit | 04-30-2009 |
20110151818 | CORRECTING QUADRATURE CROSSTALK CONTAMINATION IN RECEIVERS - An apparatus, a method and a system for correcting a phase imbalance are described. Embodiments may measure the phase imbalance inherent in a tuner and use the imbalance measure to correct the output of the tuner. Embodiments may include a tone generator to produce a single frequency tone and a tuner to receive the single frequency tone and output an intermediate frequency. The intermediate frequency may be corrected by a correction loop. Other embodiments are described and claimed. | 06-23-2011 |
20110165854 | CURRENT-MATCHING INTERMODULATION SUPPRESSION - A circuit is provided for suppression of second-order intermodulation in a double-balanced mixer circuit. The circuit includes a duplicate transconductor element for duplicating AC current in a transconductor pair of the double-balanced mixer circuit. A fundamental cancellation element cancels a fundamental component of an AC current of the duplicate transconductor element, while preserving a second-order intermodulation component. A phase inversion element feeds an output current of the fundamental cancellation element to the transconductor pair of the double-balanced mixer circuit, to substantially remove the second-order intermodulation component from a differential output of the double-balanced mixer circuit. | 07-07-2011 |
20120220253 | WIRELESS COMMUNICATIONS APPARATUS AND FREQUENCY-CHARACTERISTIC COMPENSATING APPARATUS - A wireless communications apparatus includes a setup-value storage storing therein setup information that includes a compensation coefficient that is used in frequency-characteristic compensation of a subcarrier signal that results from separating frequency components from a multicarrier modulated signal, an operation category indicating the type of handling of the compensation coefficient, and a category condition; a subcarrier-signal input unit that receives input of the subcarrier signal; an address generator that in conjunction with the input timing of the subcarrier signal, generates an address that corresponds to the subcarrier signal; an operation category selector that determines a category condition that the generated address satisfies, and selects the operation category that corresponds to the category condition; frequency-characteristic compensating unit uses the compensation coefficient that corresponds to the selected operation category and performs the frequency-characteristic compensation on the input subcarrier signal; and an output unit that outputs the frequency-characteristic compensated signal. | 08-30-2012 |
20120238230 | RF SYSTEM FOR REDUCING INTERMODULATION (IM) PRODUCTS - An RF system for reducing intermodulation (IM) products is disclosed. The RF system includes a first nonlinear element and a second nonlinear element, wherein the second nonlinear element generates inherent IM products and the first nonlinear element is adapted to generate compensating IM products. Alternatively, the first nonlinear element generates inherent IM products and the second nonlinear element is adapted to generate compensating IM products. The amplitudes of the compensating IM products are substantially equal to amplitudes of the inherent IM products. The RF system further includes a phase shifter that is adapted to provide a phase shift that results in around 180° of phase shift between the inherent IM products and the compensating IM products. The phase shifter is coupled between the first nonlinear element and the second nonlinear element. | 09-20-2012 |
20140030995 | Analog/Digital Co-Design Methodology to Achieve High Linearity and Low Power Dissipation in a Radio Frequency (RF) Receiver - Receiver design techniques are provided that are capable of producing relatively efficient, linear radio frequency (RF) receivers. During a design process, components of an analog receiver chain and digital nonlinearity compensation techniques are considered together to achieve reduced power consumption in the receiver. | 01-30-2014 |
20140235191 | RECIPROCAL MIXING NOISE CANCELLATION IN THE PRESENCE OF A MODULATED BLOCKER - A method for reciprocal-mixing noise cancellation may include receiving, from a first mixer, a first signal comprising a wanted signal at a first frequency and a modulated signal at a second frequency. The modulated signal may be a product of a reciprocal-mixing of an unwanted signal with a phase noise. One or more portions of the modulated signal may overlap the wanted signal, adding a reciprocal-mixing noise to the wanted signal. A second signal may be generated by mixing, at a second mixer, the first signal with a third signal, which is at a third frequency related to a blocker offset frequency. A gain may be applied to the second signal to generate an amplified second signal that may be subtracted from the first signal to generate a fourth signal. The fourth signal may be filtered to generate the wanted signal at the first frequency without the reciprocal-mixing noise. | 08-21-2014 |
20140364076 | Method for Reducing Second Order Distortion in Harmonic Rejection Mixer - The present disclosure relates to a method for reducing second order intermodulation distortion in a harmonic rejection mixer arranged for down-converting a radio frequency signal to an in-phase and a quadrature baseband signal. The method includes adjusting an output current of a first mixer, to reduce the second order intermodulation distortion in the quadrature baseband signal to a first value, and adjusting an output current of a second mixer, to reduce the second order intermodulation distortion in the in-phase baseband signal to a second value. | 12-11-2014 |
20140370831 | WIDE TUNING RANGE RECEIVER - A wide tuning range receiver is provided that includes first and second mixers, and first and second local oscillators. The first mixer can mix an input signal with a signal from the first local oscillator and output a signal having a first intermediate frequency, the second mixer can mix the signal having the first intermediate frequency with a signal from the second local oscillator and output a signal having a second intermediate frequency, and, for each input signal frequency, a relationship between the first and second local oscillators can be fixed. | 12-18-2014 |
20150111515 | Method, Base Station and Apparatus in a Base Station for Reducing Intermodulation Distortion - A method in a base station is provided for reducing distortion of an uplink signal received in a receiver part ( | 04-23-2015 |