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8180310 |
Filtering using impedance translator
This disclosure relates to low noise amplifiers (LNAs) and more particularly to LNAs integrated on integrated circuit (IC) chips along with radio frequency (RF) amplifiers.
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8180309 |
Lock-in amplifier and method for filtering a measurement signal using such an amplifier
A lock-in amplifier with an additional phase-sensitive detector is provided. A measurement signal is mixed in a multiplicative fashion with a reference signal, which is phase-shifted by 90 degrees,...
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8175540 |
Intermodulation distortion control
A wireless communications device comprising duplexing means for directing signals from a transmit path towards an antenna and for providing signals from the antenna to a receive path, wherein the...
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8170519 |
System and method for radio signal reconstruction using signal processor
A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be...
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8164496 |
Mismatch compensators and methods for mismatch compensation
In a compensator for compensating mismatches, and in methods for such compensation, the compensator compensates for mismatches in output signals of a system with mismatches during normal operation...
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8165553 |
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...
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8155615 |
Generation of a composite mitigation signal with a desired spectral energy distrubution
A method (1100, 1200) of generating a composite mitigation signal (216, 902, 1002) is presented. The composite mitigation signal includes an odd integer (N) of transitions (310, 312) between a...
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8149955 |
Single ended multiband feedback linearized RF amplifier and mixer with DC-offset and IM2 suppression feedback loop
A receiver arrangement includes a single ended multiband feedback amplifier, at least one single ended input, differential output mixer arrangement including a main mixer and a trim mixer, and a...
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8150356 |
Split analog/digital polynomial nonlinear term generator with reduced number of analog-to-digital converters
A polynomial nonlinear term generator is configured to receive an RF signal. An analog cubic term generator generates an analog cubic term signal and an analog square term generator generates an...
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8135372 |
Integrated cancellation circuit for RF converter spurious tones
Techniques are disclosed for eliminating or otherwise sufficiently suppressing spurious signals. The techniques are particularly useful in applications such as those that employ aggressor frequency...
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8131245 |
Mixer for downconversion of RF signals
A mixer for downconversion of RF signals includes at least one RF transistor (305); at least one switching pair (303) connected to the drain current (301) of the at least one RF transistor (305);...
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8090320 |
Strong signal tolerant OFDM receiver and receiving methods
Circuits and methods are disclosed for compensating for received signal distortion caused by non-linearities in wideband receivers. An exemplary receiver includes a distortion waveform generator...
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8085886 |
Supression of unwanted signal elements by sinusoidal amplitude windowing
A method is provided for processing a signal containing regular or quasi-regular elements of unwanted signal. The method establishes timing characteristics of the unwanted signal elements in a...
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8081929 |
Method and system for optimal frequency planning for an integrated communication system with multiple receivers
Methods and systems for optimal frequency planning for an integrated communication system with multiple receivers may include adjusting a center frequency of a low IF signal to reduce interference...
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8081946 |
Interference cancellation for reconfigurable direct RF bandpass sampling interference cancellation
Sampling may be employed to cancel an analog input radio frequency (RF) signal by using an upconverted analog cancellation RF signal to cancel the analog input RF signal at the sample instances. At...
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8078130 |
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...
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8073399 |
Device and method for matrixed adaptive equalizing for communication receivers configured to an antenna array
An apparatus and method for signal optimization is disclosed. This disclosure relates to improved device and method for improving performance and reducing cosite interference for an antenna array....
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8055233 |
High linearity passive mixer and method thereof
A high linearity mixer circuit includes a commutation network comprising four switches to provide an electrical coupling between a first pair of circuit nodes and a second pair of circuit nodes,...
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8050644 |
Highly linear mixer and method for cancelling FET channel resistance modulation
A highly linear mixer and method for cancelling field effect transistor channel resistance modulation are provided. At least a portion of the voltage of an input signal is added to a drive signal...
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8050645 |
Active resistive summer for a transformer hybrid
A communication system includes a first transmission channel with a first end and a second end. The first and second ends are coupled to first and second transformers. First and second end...
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8045946 |
Active resistive summer for a transformer hybrid
A system includes a transceiver configured to receive a composite signal. The composite signal is a composite of a transmit signal and a receive signal. A replica transmitter is configured to...
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8045942 |
System and method for radio signal reconstruction using signal processor
A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be...
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8032102 |
Receiver second order intermodulation correction system and method
A system for correcting a second order intermodulation product in a direct conversion receiver is provided. The system includes a cross-covariance system receiving a data signal and a second order...
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8019285 |
Wireless communication device
A wireless communication device which permits reduction in the scale of circuitry as well as in the power consumption. The wireless communication device includes an array of antennas, an adaptive...
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7925236 |
Cross polarization interference canceling method and cross polarization interference canceling apparatus
A cross polarization interference canceling apparatus of the present invention includes: error detector 26 for extracting a difference between a demodulated signal that is the main polarization...
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7912436 |
LNA gain adjustment in an RF receiver to compensate for intermodulation interference
A Radio Frequency (RF) receiver includes a low noise amplifier (LNA) and a mixer coupled to the output of the LNA. The gain of the LNA is adjusted to maximize signal-to-noise ratio of the mixer and...
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7894788 |
Digital and analog IM3 product compensation circuits for an RF receiver
Third-order intermodulation products (IM3) are attenuated in RF receivers by providing a typical main signal path and a parallel auxiliary signal path in which the IM3 products are accentuated, and...
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7890059 |
Successive interference cancellation in code division multiple access system using variable interferer weights
A method for successive interference cancellation in code division multiple access (CDMA) systems is provided that uses variable interferer weights. This method allows interfering signals to be...
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7877060 |
Fast calibration of AM/PM pre-distortion
A system and method are provided for calibrating Amplitude Modulation to Phase Modulation (AM/PM) pre-distortion in a transmitter operating according to a polar modulation scheme. In general, phase...
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7865202 |
Method and system for I/Q branch equalization in OFDM systems
Aspects of a method and system for I/Q branch equalization in OFDM systems may include determining a transfer function mismatch between an in-phase processing branch, and/or a quadrature processing...
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7853235 |
Field effect transistor amplifier with linearization
An amplifier comprises a source degeneration inductance and at least two field effect transistors coupled in parallel and having mutually different gate biasing. Source connections of the field...
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7835716 |
RF receiving apparatus and method using DC offset free baseband signal
An RF receiver and an RF receiving method are provided using a baseband signal in which a DC offset is removed. In the RF receiver, a noise phase removing unit generates a phase controlled local...
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7831233 |
System and method for radio signal reconstruction using signal processor
A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be...
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7826523 |
Effective adaptive filtering techniques
A noise level of an input signal is determined by a noise calculation module. based on the noise level, a boundary setting module sets a reduced constellation boundary interval. This reduced...
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7796949 |
Wireless communications terminal, communications protocol switching method, communications protocol switching program, and integrated circuit of wireless communications terminal
A wireless communications terminal prevents radio interferences caused by other wireless communications concurrent with a contactless communication. A wireless communications terminal receives, in...
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7792224 |
Interference detection in a wireless communication system
A receiver and a method are applied in a wireless communication system for detecting interference with a coexisting radar system. A signal received from an antenna is fed through an analog part and...
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7792536 |
Apparatus and method for canceling interference in wireless mobile communication system
Provided is an apparatus and method for canceling interference by a base station in a wireless mobile communication system. The method includes measuring a state of a channel with a mobile station,...
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7782748 |
Power spectrum control method for communication channels limited by disturbers and apparatus for performing such a method
A method for determining at least one operational transmit power Snk over a communication channel (Ln) coupled to a disturbance causing transceiver (n) for at least one tone (k), comprises the...
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7778618 |
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...
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7773967 |
Multi-mode—multi-band direct conversion receiver with complex I and Q channel interference mitigation processing for cancellation of intermodulation products
A Multi-mode-multi-band direct conversion receiver with complex I and Q channel interference mitigation processing for cancellation of intermodulation products (IMPs) are described. In one...
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7773966 |
Mobile terminal and method of reducing interfering phase-noise in the mobile terminal
A mobile terminal capable of breaking a phase-noise signal caused by a high power transmission signal of a mobile phone such as GSM when receiving digital TV broadcasting such as DVB-H and a method...
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7761076 |
Apparatus and method for converting single-ended signals to a differential signal, and transceiver employing same
A communication circuit includes a replica circuit that generates first and second single-ended replica transmit signals. When one of the first and second single-ended replica transmit signals is...
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7747292 |
Techniques for adaptive interference cancellation
Techniques to perform adaptive interference cancellation are described. A first apparatus may include a timing recovery module to produce a timing recovery command signal, an interference canceller...
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7742747 |
Automatic IIP2 calibration architecture
An integrated automatic IIP2 calibration architecture for wireless transceivers is disclosed. The architecture enables a wireless transceiver to generate a test radio frequency (RF) signal having a...
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7729679 |
Dynamic bandwidth filter for an FM receiver
In an apparatus, method, and system for reducing interference with an input signal to an FM receiver, a plurality of inputs are filtered by a first stage of filters. The outputs are received by an...
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7706769 |
Adaptive intermodulation distortion filter for zero-if receivers
A zero-IF receiver includes an adaptive filter that is enabled when intermodulation distortion is detected. The adaptive filter is configured as a notch filter that is centered at the location of...
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7688797 |
Method and transmission device for transmission of data in a multi-carrier system
The present invention relates to a method for the transmission of data in a multi-carrier system, provided with a frequency band, the carrier frequencies of which are distributed in a sub-carrier...
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7689172 |
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...
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7640000 |
Apparatus and method for cancellation of partially overlapped crosstalk signals
The present invention is related to a partially overlapped single-carrier crosstalk signal cancellation method and an apparatus using the same. For this purpose, the present invention provides a...
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7616926 |
Conductive DC biasing for capacitively coupled on-chip drivers
An integrated circuit containing a communication channel is described. This communication channel includes: a transmit circuit configured to transmit signals; a link coupled to an output of the...
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