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7627291 |
Integrated circuit having a routing element selectively operable to function as an antenna
An integrated circuit operable to wirelessly communicate with other devices by utilizing a radio transceiver and a routing element is disclosed. The routing element is operable to route a signal...
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7627057 |
Quadrature alignment in communications receivers
The present invention, takes advantage of the properties of quadrature signals to achieve precise quadrature alignment in a simple fashion. The expectation of the product of quadrature signals is...
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7555051 |
Method and device for estimating IQ imbalance
A quadrature transmitter and receiver have configurable I and Q channel paths that facilitate the application of selected test signals to determine gain and phase imbalances introduced by the...
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7529533 |
Configurable homodyne/heterodyne radio receiver and RFID reader employing same
The embodiments of the present invention provide a configurable homodyne/heterodyne RF receiver including first and second mixers. The configurable homodyne/heterodyne RF receiver functions as a...
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7514993 |
IQ demodulator
A method and apparatus for the demodulation, filtering, decimation and optional voltage multiplication of modulated signals to produce in-phase and quadrature outputs using a discrete time...
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7505533 |
Clock data recovery circuit with phase decision circuit
A clock data recovery circuit with feedback type phase discrimination. The clock data recovery circuit has an output signal of B bits and comprises a sampler, a phase region decision circuit, a...
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7447958 |
Parallel input/output self-test circuit and method
A parallel data transmission test system can include a receiver section ( 100 ) having input selector circuits ( 104 -O to 104 -N) that provide a received test data to logic adjust circuits ( 106...
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7248802 |
Distribution of a synchronization signal in an optical communication system
The invention relates to the distribution of a synchronization signal in an optical communication system which is inherently asynchronous. In order to accomplish a cost-efficient mechanism for...
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7212587 |
Apparatus for reducing DC offset in a receiver
Apparatus for reducing DC offset in a signal path of a conversion system comprising a front end circuit for providing an input signal having an a DC offset; an amplifier system coupled to the front...
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7164734 |
Decision directed phase locked loops (DD-PLL) with excess processing power in digital communication systems
A decoder of a data signal subjected to phase shifting keying (PSK) modulation uses a plurality of phase locked loops ( 801 - 1 to 801 - n ) having an inner decoder for short block codes, at...
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7120415 |
Radio receiver
A radio receiver is configurable to operate in both low-IF and zero-IF modes with maximum re-use of of analogue and digital circuitry between modes. The receiver comprises a quadrature...
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7110444 |
Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations
Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an...
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7088976 |
Device for reconstructing data from a received data signal and corresponding transceiver
In a transceiver which is configured in particular for transmitting optical data, there is provided a device for reconstructing data from a received data signal (RX), having a clock-signal recovery...
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7076011 |
Integrated frequency translation and selectivity
Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input...
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7058379 |
Orthogonal frequency division multiplexing transceiver and method of operating the same
For use in an orthogonal frequency division multiplexing (OFDM) transceiver, a multimode local oscillator circuit and a method of operating the same. In one embodiment, the circuit includes: ( 1 )...
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6990157 |
All-digital FSK demodulation with selectable data rate and adjustable resolution
All-digital FSK demodulation can be accomplished by producing in response to a received IF signal digital information ( 22 ) indicative of a frequency of the IF signal. A symbol represented by the...
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6963623 |
Multi-system correspondence receiver
A carrier wave NTSC component or a VSB pilot signal in an IF signal is extracted and judged. Then, on the basis of the judgment result, either of demodulation circuit 13 and 14, which is...
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6922436 |
Method and apparatus for clock timing recovery in χDSL particularly VDSL modems
Method and modem for fast timing recovery of transmitted data between a master χDSL modem and a slave χDSL modem, over a noisy, high loss, high distortion wiring. Transmitted QAM symbols are...
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6895189 |
Optical synchronization system
A synchronization system in accordance with the principles of the invention includes a central synchronizing management unit, at least one synchronization distribution unit, and at least one...
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6839389 |
Digital quadrature demodulation and decimation without multipliers
One embodiment of the present invention includes a gating circuit, a demultiplexer, and an integrator. The gating circuit gates an input sample with a first clock, the input sample being clocked by...
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6809584 |
Signal transmission and receiving methods optimized for integrated circuit implementation
A demodulator for demodulating a modulated input signal transmitted at a carrier frequency includes a current mirror for receiving the modulated input signal and generating a first and a second...
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6807237 |
Radio apparatus and transmission/reception method
At the time of ordinary communication, up-mixer 108 combines a signal with a frequency f2 from frequency synthesizer 124 with I and Q signals for transmission that are quadrature modulated in...
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6763074 |
Adaptive configurable demodulation system with multiple operating modes
A demodulation system capable of configuring itself responsive to channel conditions. A plurality of detectors may be provided, one or more of which may be better able to handle a particular form...
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6711397 |
Structures and methods for direct conversion from radio frequency modulated signals to baseband signals
A direct conversion receiver is disclosed that converts RF signal into corresponding quadrature baseband signals without requiring conversion through an intermediate frequency. The direct...
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6680992 |
Clock identification and reproduction circuit
A clock identification and reproduction circuit which synchronizes a clock signal with an input signal includes a voltage controlled generator for generating a clock signal, a phase comparator for...
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6560301 |
Integrated frequency translation and selectivity with a variety of filter embodiments
Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input...
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6549763 |
Receiving apparatus and method
A receiving apparatus and method which can prevent second order harmonic interference and beat interference in a direct orthogonal detector is disclosed. When a control signal of the high level is...
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6480532 |
Echo cancellation for an ADSL modem
An echo cancellation functionality taps a digital transmit signal from a transmit channel for processing through an adaptive filter of an echo channel to generate an echo cancellation signal. The...
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6477197 |
Method and apparatus for a cable modem upstream RF switching system
A method and apparatus providing for a multifrequency receiver with upstream switching of received frequencies. The invention is described in connection with a cable plant having a plurality of...
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6377312 |
Adaptive fractionally spaced equalizer for received radio transmissions with digital content, such as DTV signals
In a radio receiver for digital transmissions, an adaptive channel equalizer is clocked at a sampling rate higher than symbol rate by a factor k and employs decision feedback for adjusting the...
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6297691 |
Method and apparatus for demodulating coherent and non-coherent modulated signals
A receiver receives modulated message signals in non-coherent FSK and coherent 8PSK protocols. A selectively configurable processor demodulates the message signals, and includes a demodulator that...
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6229889 |
Robust signaling tone frequency measurement
Apparatus and methods for adaptively, reliably, and accurately measuring the frequency of an alerting or other signaling tone. A tone detector measures the frequency of a tone (continuous or...
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6204725 |
Circuit for demodulating digital signal undergoing different modulation schemes
A circuit for demodulating a signal having a temporal mixture of different modulation schemes applied thereto includes a synchronization-word-detection unit which detects synchronization words...
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6167081 |
Dual mode receiver
A demodulation subsystem includes an equalizing demodulator and a non-equalization demodulator, each of which receive a baseband signal, and an output control selector that selects the output of...
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6166572 |
Voltage-controlled delay line, direct phase controlled voltage-controlled oscillator, clock/data recovery circuit, and clock/data recovery apparatus
A clock/data recovery device employs a phase-locked loop that supplies a single clock signal and a control voltage signal to at least one clock/data recovery circuit. The clock/data recovery...
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6140869 |
Device for demodulating a binary phase-shift keyed signal
A device for demodulating a binary signal having a predetermined carrier frequency and phase-modulated by encoded pulses. The device includes a phase-locked loop circuit having a phase comparator...
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6081155 |
Digital quadrature discriminator for demodulation of frequency-modulated information
A circuit is designed with a delay circuit (102) coupled to receive a frequency-modulated data signal (100) at a delay input terminal. The delay circuit produces the data signal (103) after a...
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6078630 |
Phase-based receiver with multiple sampling frequencies
A receiver for input signals generated using a phase-based modulation scheme such as bipolar-phase shift-keying (BPSK) modulation or quadrature-phase shift-keying (QPSK) modulation. The receiver...
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6057730 |
Digital demodulator
A clock recovery circuit includes an A/D converter and samples sampled signals from a received signal of a modulation rate depending on a sampling clock signal with a frequency twice the...
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6035005 |
Receiver with baseband I and Q demodulator
A baseband demodulator receives inphase and quadrature signals I (116) and Q (117) representing a phase angle and amplitude. The demodulator (114) includes a discrete time continuous amplitude...
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5977821 |
Digital detection method and circuit for PSK modulated signals
In a digital radio communication apparatus which receives PSK modulated signal, a plurality of items of quantized data are sampled at a plurality of points including a central point, which...
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5926750 |
Receiver
In accordance with the present invention, a receiver of the type receiving both a signal subjected to FM (Frequency Modulation) and a signal subjected to orthogonal modulation is capable dealing...
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5926065 |
Digital modulator having a digital filter including low-speed circuit components
A digital demodulator which demodulates an analog signal obtained through a quadrature amplitude modulation to produce a digital demodulated signal includes a converter to convert the analog signal...
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5903186 |
Demodulator of MSK signal
A demodulator for demodulating an MSK signal constituted by a sequence of MSK modulated symbols is disclosed. An exclusive OR signal obtained by delay detection is delayed by delay times shorter...
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5872812 |
Carrier reproducing circuit including region deciding circuitry
A carrier reproducing circuit for detecting a phase error when an inputted baseband signal is out of phase and bringing the baseband signal into phase even in QAM systems in which normal signal...
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5822366 |
Transceiver and method for generating and processing complex I/Q-signals
The invention relates to a transceiver for generating complex I/Q-signals on a transmission frequency (f TX ) and for receiving them on a reception frequency (f RX ). The device comprises a first...
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5818297 |
Digital demodulator for a phase-modulated signal
The demodulator is for processing a signal having a carrier modulated by (0, π) phase shifts and sampled at a rate that is at least twice the frequency of the carrier co. It comprises, in cascade:...
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5805018 |
High-speed demodulating method of burst data and apparatus for same
A high-speed demodulating method of burst data capable of performing demodulation process at high speed in a single hardware structure. An input signal digitally modulated is taken in into an input...
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5787124 |
Quadrature detector and amplitude error correction method for quadrature detector
A method for correcting an amplitude error between an I signal and a Q signal which are outputted from a quadrature detector including a first multiplier for multiplying a reference signal and a...
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5783967 |
Frequency shift keying demodulation circuit using logic circuitry
A miniaturized FSK demodulation circuit for accurately demodulating a signal having a small modulation index comprises a multiplier for multiplying a FSK modulated input signal by 4, an oscillator...
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