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7593491 Quadrature single-mixer multi-mode radio frequency receiver  
The present invention is a quadrature multi-mode RF receiver that uses a single quadrature mixer for tuning to desired frequency bands. In a direct conversion mode of operation, the RF receiver...
7573045 Plasmon wave propagation devices and methods  
Nanoantennas are formed on a substrate (e.g., silicon) and generate light via interactions with a charged particle beam, where the frequency of the generated light is based in large part on the...
7535976 Apparatus and method for integration of tuner functions in a digital receiver  
A receiver to process a RF input signal having a plurality of channels includes a direct down conversion circuit, a demodulation circuit, and a local oscillator circuit. The direct down conversion...
7439799 Frequency shift keying demodulator robust for frequency offset  
A frequency shift keying demodulator robust for frequency offset is provided. The demodulator is used to enable the signal to be received correctly when the frequency offset occurs. A...
7356077 Method and apparatus for testing network integrity  
Apparatuses and methods for testing the integrity of high speed optical fiber transmission networks are presented. Data from an optical network, for example, NRZ formatted data at forty gigabits...
7245655 Dual antenna receiver  
Structures and techniques for implementing multiple-antenna configurations within a radio frequency receiver are provided. In one aspect, a modularized multi-antenna receiver is provided having...
7092687 Five-port topology for direct down-conversion  
An apparatus for a direct down-conversion of modulated RF signals, the device including: a first power detector connected between an input port for the modulated RF signal and ground, which outputs...
7054778 Method and device for processing analogue output signals from capacitive sensors  
An analogue output signal of a sensor which comprises a carrier signal with a carrier frequency ω C which is modulated by a measurement size is sampled with a sampling frequency ω A to receive...
7049884 Demodulation arrangement for a radio signal  
A demodulation arrangement for a radio signal is disclosed wherein an I/Q mixer converts the radio signal to a real and an imaginary component and supplies the components to a limiting circuit. The...
6982592 Zero if complex quadrature frequency discriminator and FM demodulator  
A frequency discriminators (FD) and frequency modulation (FM) demodulators, utilizing single sideband (SSB) complex conversion directly to zero IF, suitable for direct demodulation at high...
6933775 Circuit for detecting and correcting central level of FSK demodulation signal  
A circuit for detecting and correcting a center level is constituted for when the length of a code of “1” or “0” in an FSK signal is extremely long and superimposed with a frequency...
6831953 Method of, and a radio terminal for, detecting the presence of a 2-FSK signal  
A method of, and terminal for, detecting the presence of a 2-FSK signal, the method comprising receiving ( 10 ) a 2-FSK signal, quadrature frequency down-converting ( 34,35,36 ) the received signal...
6762642 Method and apparatus for frequency shift-keying demodulation and applications thereof  
A method and apparatus for frequency shift-keying (FSK) demodulation includes processing that begins by generating a charge signal, a data acquisition signal, and a reset signal from an I component...
6703896 Method and demodulator for FSK demodulation, and receiver including such a demodulator device  
In a method for demodulating an analog FSK signal (FSKin), a current sample (Id(k);Id i ) of the downconverted and digital inphase component is multiplied with a previous sample (Qd(k−1);Qd i−1...
6529783 Process for estimating a parasite phase shift during reception of a multi-carrier signal and the corresponding receiver  
A method for estimating an interference phase shift when receiving a multicarrier signal formed of a time series of symbols modulating a plurality of carrier frequencies, at least some of the...
6408035 Simplified receiver for frequency shift keyed signals  
In a receiver for FSK modulated signals, an input signal is applied to a converter ( 20 ) which mixes the input signal with a local oscillator frequency. The frequency of the local oscillator is...
6369647 Demodulator circuit and method of tuning  
A demodulator circuit ( 10 ) includes an oscillator ( 12 ) and an injection circuit ( 14 ). An Automatic Frequency Control (AFC) signal adjusts the tail current of a current source ( 28 ) provided...
6332007 Automatic frequency control in FSK receiver using voltage window deviation  
An AFC circuit for controlling an oscillation frequency of a local oscillator is disclosed. An f/V converter converts a frequency of an FSK signal to a received signal voltage varying depending on...
6288618 Logic-based architecture for FSK modulation and demodulation  
A cost-effective continuous phase logic-based modulator and demodulator are provided to allow communications using binary frequency shift keying (BFSK) as well as M-ary FSK techniques. The...
6040738 Direct conversion receiver using single reference clock signal  
A direct conversion receiver includes a reference clock signal generating section for generating reference clock signal. An amplifier section amplifies a received signal and extracts a desired...
6031428 Steered frequency phase locked loop  
A Steered Frequency Phase Lock Loop (SFPLL) comprises a phase loop that functions like a normal phase locked loop (PLL) and locks to the input signal, and a frequency loop that uses a reference...
6002725 M-ary FSK receiver  
An M-ary FSK receiver in which a frequency down-converted signal is treated as an M-ary DPSK signal with symbol repetition coding. The output of a frequency demodulator (20) is integrated (22) over...
5999577 Clock reproducing circuit for packet FSK signal receiver  
A circuit is provided by which in the case of the transmission of a short packet signal through an FSK transmission channel having a frequency error for transmission and reception, directly from...
5987078 Carrier regenerating circuit  
A carrier regenerating circuit used for a demodulator which demodulates many-valued orthogonal amplitude modulation signals. The carrier regenerating circuit consists of a first PLL (phase-locked...
5949830 Small wireless radio  
In a direct conversion receiver with an AFC function comprising a local oscillation circuit constituted by a synthesizer, the local oscillation frequency is prevented from radiating as an interfere...
5867059 Demodulating system for MSK and GMSK signal using a fast fourier transform converter  
A demodulating system for estimating frequency offset and sampling time error by a Fast Fourier Transform operation, which receives a modulated signal sent from a GMSK (Gaussian Low-Pass Filtered...
5822378 Receiver, a demodulator, and a demodulation method  
Known is a receiver having a demodulator for intermediate frequency modulated frequency shift keyed signals. The known demodulator applies absolute period time measurements expressing the period of...
5805017 Baseband demodulation of M-ary frequency shift keyed signals and a receiver therefor  
A method of, and receiver for, receiving and demodulating M-ary FSK symbols, where M equals two or four, comprising over sampling a received signal to obtain sub-symbols which are treated as...
5799043 Method and apparatus for decoding a two-level radio signal  
A selective call unit (800) comprising a receiver (100) and a processor (810) is used for decoding a 2-level radio signal. The processor (810) is adapted to convert in-phase and quadrature signals...
5789991 FSK modulating and demodulating apparatus wherein each binary data is represented by same number of cycles of modulated signal  
A signal FSK-modulated with a binary data signal has first signal portions representing first logical level data contained in the binary data signal and second signal portions representing second...
5784692 Method and apparatus for generating non-linear variable impedance  
An impedance-generating device that provides a resistance and a reactance that are non-linear functions of a signal over a wide impedance range (VariablE Non-Linear Impedance Circuit Electronics,...
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...
5781064 Digital filtering system for filtering digital outputs of a four level FSK demodulator  
A digital filtering system for filtering a first and a second digital signals inputted from a FSK (frequency-shift-keying) demodulator to generate a first and a second filtered digital signals. The...
5748036 Non-coherent digital FSK demodulator  
A non-coherent frequency shift keying (FSK) demodulator, for receiving a N-ary FSK modulated input signal, demodulating the signal to obtain output data, in which the N-ary FSK modulation has N...
5724001 Method and apparatus for demodulating a frequency shift keyed signal  
A receiver (100) is utilized for demodulating a multi-level frequency shift keyed (FSK) signal. The receiver (100) includes a mixer (102) for mixing the multi-level FSK signal to generate an...
5717721 Demodulation correcting circuit for FSK receiver  
A demodulation correcting circuit for an FSK signal receiver which include an AFC for correcting a reception frequency error to provide stabilized demodulation, said demodulation correcting circuit...
5633898 Automatic frequency control apparatus for FSK receiver and FSK receiver including the same  
A first AFC apparatus receives and detects I and Q signals from a received first FSK signal with a local osc signal; demodulates the I and Q signals; F/V-converts I or/and Q signals into a voltage;...
5623225 Quadrature signal demodulation using quantizing and accumulating  
A demodulator (18) which receives digital representations of a received signal converts those signals into analog signals (53) in a pair of multiplying analog-to-digital converters (MDACs) (21, 22)...
5612976 Detectors  
A direct conversion Binary FSK radio receiver has an AFC loop comprising an Exclusive-Or phase detector 104 responsive to the I 3 and Q 3 signals. I and Q filters 100, 101 are not identical but...
5606581 Method and apparatus for the cancellation of interference in electrical systems  
A cancellation circuit is provided where one demodulator circuit provides a demodulated output having interference voltage owing to interference between carrier signals, between a carrier signal...
5598125 Method for demodulating a digitally modulated signal and a demodulator  
The invention relates to a method for demodulating a digitally modulated signal and to a demodulator. According to the method, a signal (S) to be received is mixed essentially to quadrature related...
5579338 Spread spectrum receiver using partial correlations  
A complex baseband signal as long as one period of PN signal is divided into three sequences. The three partial signals are input to three correlators which then calculate the correlations between...
5539355 Frequency-shift-keying detector using digital circuits  
A signal modulated by frequency-shift keying is input to a detector consisting of an instantaneous phase detection circuit that detects the instantaneous phase of the input signal, a...
5535249 Precise detection of frequency error for bursts modulated by predetermined symbol sequence  
In detection of a frequency error of a local frequency for quadrature demodulation of a received signal by sampling (S2) each burst of the received signal by a sampling signal at a sampling period...
5533062 Method and apparatus for carrier tracking and demodulation  
A frequency shift keyed receiver (214, 220, 218) estimates a carrier frequency and demodulates (1020) a symbol value associated with the carrier frequency. During symbol intervals, the receiver...
5533061 Method and apparatus for detecting an FSK encoded carrier signal  
An integrated FSK detector circuit includes a first counter that receives a carrier signal and provides a multiple-bit output for reducing the frequency of the carrier signal into a plurality of...
5497121 Automatically correcting data detection circuit and method for FSK modulated signals  
A data detection circuit (30) for automatically adjusting to an FSK modulated signal to set a proper trip point for differentiating logic high and low. The detection circuit (30) includes: A...
5469112 Communication device with zero-crossing demodulator  
A communication device (100) includes mixers (104) and (108) which mix a local oscillator (112, 106) with a received signal to produce in-phase (i) and quadrature (q) components. The direction of...
5455536 Demodulator circuit and demodulating method employing bit error rate monitor  
A demodulator circuit and a demodulating method are disclosed. A demodulator including a phase-locked loop for a receive carrier recovery or a phase lock recovery demodulates an input received...
5453715 Communication device with efficient multi-level digital demodulator  
A communication device (100) includes mixers (104) and (108) which mix a local oscillator (112, 106) with a received signal to produce in-phase (i) and quadrature (q) components. The direction of...
Matches 1 - 50 out of 144 1 2 3 >