Matches 1 - 39 out of 39


Match Document Document Title
US20050037724 Cancellation system and method for a wireless positioning system  
A cancellation system may utilize a system architecture that delays the received signals and cancels less than all the received signals from the delayed version of the received signals. An...
US20070037539 Method of suppressing co-channel interference in a wireless communication system  
A method of suppressing co-channel interference in a wireless communication system, which computes the power intensities of coherent signals in different spatial orientations based on a result...
US20060146724 Method and system for multi-function push-to-activate  
A multifunction push-to-activate system (40) can include a push to activate (PTx) button (22) on a communication transceiver (20) for activating one among a plurality of communication functions...
US20060234664 Calibration method for suppressing second order distortion  
Calibration methods and circuits for suppressing second order distortion in a direct conversion receiver. In the calibration method, a signal output by a down converter is filtered to obtain an...
US20140378077 DOWN-CONVERSION CIRCUIT  
A down-conversion circuit for a receiver circuit is disclosed, the down-conversion circuit comprises a first passive switching mixer arranged to down-convert a received radio frequency, RF, signal...
US20080119157 Frequency converter circuit and satellite position signal receiving device  
A mixer mixes respective signals of L1, L2C, and L5-E5a with a local oscillation signal where the frequency of the L1 signal has an image relationship with the frequencies of the L2C and L5-E5a...
US20120322398 Harmonic Rejection Mixer Architecture with Reduced Sensitivity to Gain and Phase Mismatches  
A harmonic rejection mixer includes a first scaling circuit for scaling an RF signal to generate a plurality of scaled RF signals, a first switching stage for sampling the scaled RF signals using...
US20080132191 Image rejection calibration system  
Image rejection calibration includes initializing the calibration mode by applying to quadrature mixers, in place of the wanted RF input, an RF source in the frequency range of the wanted RF...
US20080181340 Spur Rejection Techniques for an RF Receiver  
A receiver (100) includes a mixing digital-to-analog converter (DAC) (120), a direct digital frequency synthesizer (DDFS) (116), and a clock circuit (114). The mixing DAC (120) includes a radio...
US20070161361 Interference rejection in telecommunication system  
An interference suppression scheme is provided for a radio receiver. According to the provided interference suppression scheme, the bandwidth of a received pilot signal and a data signal is...
US20060009186 Receiver front-end filtering using low pass filtering and equalization  
Signal processing for a receiver, such as a radio receiver within a cellular telephone, includes providing frequency conversion, preferentially passing a desired signal following the conversion,...
US20090258628 Time-Error and Frequency-Error Correction in a Multi-Carrier Wireless Communications System  
Methods and apparatus for automatic frequency control in wireless receivers configured to simultaneously receive multiple carrier signals at distinct radio frequencies are disclosed. An exemplary...
US20090203342 FAST IMAGE REJECTION  
Fast image rejection. Dual down conversion processing of a received signal by performing both low side injection and high side injection thereby generating a first down converted signal and a...
US20060154640 Image rejection mixer and terrestrial digital multimedia broadcasting tuner of low intermediate frequency structure using the same  
Disclosed herein are a terrestrial digital multimedia broadcasting (DMB) tuner of a low intermediate frequency (IF) structure which is applied to a mobile communication terminal, such as a mobile...
US20080096513 LOW IF RECEIVER OF REJECTING IMAGE SIGNAL AND IMAGE SIGNAL REJECTION METHOD  
Provided are an image signal rejection method capable of avoiding demodulation of an image signal along with a real signal in a radio frequency (RF) signal and a low IF receiver of rejecting an...
US20060068740 Receiver if circuit including image rejection mixer and active bandpass filter  
A receiver IF circuit includes the following: a variable gain amplifier for amplifying an RF input signal; a frequency converter for mixing the amplified RF input signal and a local signal to...
US20060063505 Method and apparatus for controlling interference suppressing receivers  
A wireless communication receiver is configured to suppress interference with respect to a received signal of interest on a selective basis responsive to evaluating whether the receiver currently...
US20090098847 APPARATUS FOR EXTENDING THE BANDWIDTH OF A SPECTRUM ANALYZER  
A spectrum analyzer is provided with frequency-scalable circuit architectures that extend the bandwidth of the spectrum analyzer using an array of couplers. The array of couplers is distributed...
US20100159866 Systems and methods for interference cancellation  
Systems and methods for interference cancellation in which a first signal having a first frequency may be cancelled with a second frequency having a second and different (e.g., lower) frequency by...
US20060128340 Radio frequency mixer with notch filter  
A mixer with integrated filter for single-ended image rejection is provided, including a single-end to differential (S-to-D) converter, an image rejection notch filer and four Gilbert cell...
US20110009081 METHOD OF OPERATION OF A PASSIVE HIGH-FREQUENCY IMAGE REJECT MIXER  
A passive implementation of an image reject mixer (IRM), capable of operating at very high frequency, is operative according to the disclosed method. The IRM comprises a quad MOS multiplier and a...
US20140342684 Method of Manufacture of a Passive High-Frequency Image Reject Mixer  
A passive implementation of an image reject mixer (IRM), capable of operating at very high frequency, is manufactured in a variety of silicon processes. The IRM comprises a quad MOS multiplier and...
US20110136460 MIXER AND RADIO FREQUENCY RECEIVER USING THE MIXER  
A mixer used in a Radio Frequency (RF) receiver is provided. The mixer includes a first harmonic rejecter for rejecting a harmonic signal component from a first input signal; and a second harmonic...
US20110105071 IMAGE FREQUENCY REJECTION MIXER  
An image frequency rejection mixer has a first differential transconductor that receives a differential mixer input signal, a second differential transconductor that receives the differential...
US20100197252 FM-AM DEMODULATOR AND CONTROL METHOD THEREFOR  
A FM-AM demodulator includes a FM signal amplifier, a local oscillator, an image oscillator, a first selector, a first orthogonal mixer, an AM signal amplifier, a first frequency divider, a second...
US20080160946 Systems and Methods for Reducing Broadband Image Noise Through a Programmable Bandwidth RF Variable Gain Attenuator  
Systems for suppressing image noise are provided. In this regard, one embodiment includes a system for suppressing image noise comprising a low noise amplifier (LNA) configured to amplify a...
US20100227580 CIRCUIT AND METHOD FOR IMAGE FREQUENCY REJECTION  
A circuit and method for image frequency rejection is provided that includes an analog dual-quadrature mixer device whose signal inputs for an in-phase-signal and a quadrature-phase signal are...
US20100167680 Controllable image cancellation in a radio receiver  
In one embodiment, a receiver includes parallel paths for signal channel processing and image channel processing. The paths may include a mixer to receive an intermediate frequency (IF) signal and...
US20070293181 NOISE SUPPRESSION METHOD, NOISE SUPPRESSION METHOD PROGRAM, RECORDING MEDIUM RECORDING NOISE SUPPRESSION METHOD PROGRAM, AND NOISE SUPPRESSION APPARATUS  
An apparatus for suppressing noise of a video signal. The apparatus includes: a difference-signal generation section generating a difference signal being a field or frame difference between the...
US20050186920 Apparatus for and method of noise suppression and dithering to improve resolution quality in a digital RF processor  
A novel apparatus for and a method of noise and spurious tones suppression in a digital RF processor (DRP). The invention is well suited for use in highly integrated system on a chip (SoC) radio...
US20150349900 WIDEBAND CALIBRATION METHOD AND WIDEBAND CALIBRATION APPARATUS FOR CALIBRATING MISMATCH BETWEEN FIRST SIGNAL PATH AND SECOND SIGNAL PATH OF TRANSMITTER/RECEIVER  
A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a transmitter, including: utilizing the receiver to receive at least a test signal via the first...
US20150288394 MULTI-USER SATELLITE RECEIVING SYSTEM AND METHOD THEREOF  
An integrated multi-user satellite receiver includes: a single-chip, and the single-chip includes: a first synthesizer for generating a first oscillating signal having a first frequency; a first...
US20140270019 DYNAMIC LOW-IF FREQUENCY FOR INTERFERENCE MITIGATION  
A method of operating a receiver in a communications system is disclosed. The receiver receives a radio-frequency (RF) data signal and converts the RF data signal to an intermediate frequency. The...
US20140242935 Wide-Bandwidth Signal Canceller  
A signal canceller includes a dual-drive electro-optic modulator having separate first and second electrical inputs. The first electrical input is coupled to a first portion of a first signal and...
US20130023226 IMAGE CANCELLATION IN RECEIVERS USING DUAL ADAPTIVE FILTERS  
The present disclosure includes apparatus, systems, and techniques relating to receiver image cancellation. A described technique includes receiving a downconverted signal in a digital domain, the...
US20110189970 Receiving apparatus and image rejection method  
An orthogonal mixer generates first I and Q signals by down-converting an RF signal. A complex filter has an asymmetrical frequency gain property between a positive frequency domain and a negative...
US20110086605 IMAGE CALIBRATION AND CORRECTION FOR LOW-IF RECEIVERS  
Embodiments of a system for calibrating the image rejection of a receiver include an image-rejection correction circuit that modifies the gain and phase of a first channel of a baseband image...
US20110070858 IMAGE REJECTION  
A receiver (10) for extracting a desired signal component (70) from a received signal, which received signal contains the desired signal component (70) and may contain an interfering signal...
US20100330947 Providing Image Rejection Calibration For A Receiver  
According to one embodiment, a method for updating filter values of an image canceller is provided. The method may include determining a channel-to-image (C/I) ratio between a channel signal and...

Matches 1 - 39 out of 39