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7606549 |
Selective channel tuner and tuning method
A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator...
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7603098 |
Programmable IF frequency filter for enabling a compromise between DC offset rejection and image rejection
The invention enables a compromise between DC offset rejection and image rejection through the use of a bandpass filter having a variable center frequency.
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7583947 |
Method and system for single sideband mixing receiver architecture for improving signal quality
Certain embodiments of the invention may be found in a method and system for single sideband mixing receiver architecture for improving signal quality in an RF communication system. An embodiment...
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7580692 |
Mobile wireless communications device having low-IF receiver circuitry that adapts to radio environment
A mobile wireless communications device, system and associated method includes a housing and circuit board that includes radio frequency (RF) circuitry and processor operative with each other. The...
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7580483 |
Trimming of local oscillation in an integrated circuit radio
A method and apparatus for trimming of a local oscillation within a radio frequency integrated circuit (RFIC) includes processing that begins when an RFIC receives a radio frequency (RF) signal...
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7567783 |
I/Q mismatch calibration of direct conversion transceivers using the OFDM short training sequence
A system and method are provided for compensating for an I/Q mismatch of either a direct conversion transmitter or a direct conversion receiver based on known short training symbols of a Short...
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7558546 |
Selectable high-side/low-side mix for high intermediate frequency (IF) receivers
A method in which one of a high-side mix mode and a low-side mix mode is selected in response to an interference characteristic of a desired channel of a radio frequency (RF) input signal is...
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7555281 |
RF receiving apparatus
A level comparator supplied with oscillation signal of local oscillator for comparing the signal level of oscillation signal with a certain predetermined threshold value, and a driving section...
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7555076 |
Modular device for multiple reception of a modulated signal
A reception device includes a number of reception paths and a decoder. The reception paths are sequenced and each reception path includes a calculation module embodied to deliver a combined...
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7546109 |
Gilbert mixers with improved isolation and methods therefor
The employment of cascoding in connection with improving mixer isolation in a Gilbert mixer circuit is provided. In this vein, there is broadly contemplated herein, inter alia, the provision of a...
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7545857 |
Receiver architecture employing low intermediate frequency and complex filtering
A communications receiver architecture characterized by a relatively low intermediate frequency (IF) and a polyphase filter. The receiver includes an input amplifier coupled to a carrier signal....
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7525481 |
Performance of a receiver in interfering conditions
A device 20 includes a receiver 21 for receiving and processing signals at least in a first frequency band and an antenna 216 which is connected to the receiver 21 . In order to improve the...
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7522899 |
Image rejection scheme for receivers
An RF receiver image rejection scheme. The RF is received and mixed in two quadrature channels allowing separation of the undesired image portion within the RF signal from the desired portion. The...
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7519349 |
Transceiver development in VHF/UHF/GSM/GPS/bluetooth/cordless telephones
A digital communication circuit can be implemented can be implemented in a CMOS, or other IC structure. The digital circuit can utilize negative frequency removers or image frequency removers in...
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7519348 |
Harmonic suppression mixer and tuner
A harmonic suppression mixer for down converting an RF signal to a complex I and Q baseband signal that uses a plurality of switching mixers each with a gain stage to produce a sinusoidal weighted...
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7509110 |
High-order harmonic rejection mixer using multiple LO phases
A mixer produces an improved output signal during frequency translation of an input signal using a local oscillator (LO) signal. The mixer includes five component mixers connected in parallel. Each...
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7509106 |
Test signal generation circuit, and reception circuit
A test signal generation circuit includes a tuning circuit, a local oscillation circuit for forming orthogonal local oscillation signals, first mixer circuits for frequency-converting the reception...
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7493141 |
Common radio architecture for multi-mode multi-band applications
A multi-mode, multi-band mobile station for use in wireless networks operating under different air interface standards. The present invention, the mobile station comprises a plurality of low-noise...
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7493097 |
High dynamic range compact mixer output stage for a wireless receiver
A mixer is disclosed having an output stage with an amplifier or gain device configured in a feedback loop to maintain a virtual ground at the input to the gain device. The gain device provides...
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7480496 |
High-frequency receiver and portable device using the same
A high-frequency receiver and a portable device using the same receiver are proposed for reducing power consumption. Image interference determiner ( 44 ) determines whether or not image...
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7466973 |
Single conversion tuner
A single conversion tuner suitable for receiving RF signals having different requirements as to selectivity, linearity and image rejection is presented. Tuners of this kind are particularly useful...
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7463862 |
Methods and apparatus to integrate image rejection into quadrature mixers
Methods and apparatus to integrate image rejection into quadrature mixers are disclosed. A disclosed image-rejection quadrature mixer comprises a quadrature mixer, and a cross-coupled differential...
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7460832 |
Methods and apparatuses for minimizing co-channel interference
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first frame using a...
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7456740 |
Detector device
The present invention relates to a detector device and, more particularly, to a detector device comprising a self-diagnosis means for monitoring the correct performance or otherwise of the device....
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7454185 |
Wideband I/Q signal generation device
An apparatus for generating an in-phase/quadrature-phase (I/Q) signal in a wireless transceiver is disclosed, including a local oscillator for generating an oscillation signal, and first and second...
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7450924 |
Interference cancellation and receive diversity for single-valued modulation receivers
A combined SAIC receiver and a multiple-antenna, receive diversity receiver are employed to reduce interference in a wireless system. The real and imaginary parts of the de-rotated signal for each...
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7450923 |
Method and system for controlling carrier leakage in a direct conversion wireless device
According to one embodiment of the invention, a system for controlling carrier leakage in a communications device is provided. The system includes a first mixer unit operable to receive a first...
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7424281 |
Image-rejection mixers having high linearity and high gain and RF circuits using the same
An integrated semiconductor image-rejection mixer having high linearity and high gain. In addition to the components of a classic image-rejection architecture, the present mixer has a...
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7423699 |
Fully integrated tuner architecture
An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation...
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7412209 |
Shifted channel characteristics for mitigating co-channel interference
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises shifting a characteristic of the...
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7400873 |
Method and system for image rejection by using post mixer I/Q equalization
The invention provides a system and method for tuning broadband signals by using post mixer I/Q equalization. An Image Rejection Mixer (IRM) is used for mixing Radio Frequency (RF) signals and...
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7379725 |
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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7373131 |
Signal processing method and signal processing apparatus
A signal input into an input terminal 1 is input into mixers 2, 4 , and down-converted with local signals having a phase difference of 90 degrees, respectively, whereby an I-signal and a...
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7373124 |
Receiver
A receiver includes a tuning circuit for picking up a reception signal having a desired frequency, a local oscillator for forming an oscillation signal, a first mixer for frequency-converting the...
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7369835 |
Image rejection mixer providing precision image rejection
An image rejection mixer includes a first mixer, a second mixer, a first output adjust circuit, and a second output adjust circuit. The first mixer is coupled to receive an input RF signal and a...
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7369834 |
Impedance-matched IQ network for an image rejection circuit
An impedance-matched IQ network includes a phase shift circuit and a back termination. The phase shift circuit includes an in-phase mixer port for receiving the in-phase signal, a quadrature-phase...
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7362826 |
Receiver including an oscillation circuit for generating an image rejection calibration tone
A receiver circuit includes an oscillator circuit configured to generate a calibration tone and a phase locked loop (PLL) reference signal. An output frequency of the VCO may be divided by...
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7362814 |
Memoryless spectrum correction algorithm for non-ideal I/Q demodulators
An algorithm for correcting the output of an analog I/Q demodulator without the need for calibration or storing state information. The output of the analog I/Q demodulator is digitized, and the...
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7346324 |
Grounded-emitter circuit, and high-frequency receiver and high-frequency transmitter using the same
A grounded-emitter circuit is composed of a transistor, a first impedance circuit, and a second impedance circuit. The transistor is an NPN transistor, and the base of the transistor is an input...
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7336940 |
Frequency conversion techniques using antiphase mixing
A frequency upconverter using mixers operating on one or more signals and inverted versions thereof and a subtractor, such as a balun, for subtractively combining the mixer outputs to produce an...
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7333791 |
Use of an image reject mixer in a forward data channel tuner
Disclosed are systems and methods which utilize an image reject mixer in an out-of-band mixer application such as in a forward data channel frequency converter. For example, according to a...
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7308243 |
Mixer arrangement and method for mixing signals
A mixer arrangement includes a first mixer having at least one signal input for receiving a first signal the frequency of which is to be changed. The mixer arrangement also includes at least one...
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7302248 |
Harmonic image-reject converter
A signal generator for generating signals that are spaced π/X rad apart, where X is an integer. The signal generator includes at least one delay cell with a delay that approximately corresponds to...
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7299027 |
MIMO receiver and MIMO reception method for selection of MIMO separation and channel variation compensation
A Multi-Input/Multi-Output (MIMO) receiver may include a plurality of receiving antennas that receive a plurality of radio signals and an estimation section that finds channel estimation values of...
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7299020 |
Tunable multi-band receiver by on-chip selectable filtering
A multiple frequency RF communications receiver is disclosed which permits greater integration on standard silicon chips and consumes less power than previous receivers. A new method for selecting...
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7292836 |
Direct conversion receiver
The invention relates to a direct conversion receiver for down-converting a received multi-carrier signal comprising at least a first and a second carrier signal at image carrier frequencies to a...
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7271647 |
Active polyphase filter
The present invention provides methods and apparatuses for a polyphase filter, comprising: a first and second cascoded differential amplifiers configured to receive a first and second differential...
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7266360 |
Low noise amplifier for wireless communications
A low noise amplifier is provided for the receiver of a wireless communications system. The amplifier incorporates an image rejection function by incorporating a notch filter formed by an inductor...
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7266357 |
Reduced local oscillator feedthrough quadrature image reject mixer
An RF communications circuit having a reduced LO feed through image reject mixer is disclosed. The image reject mixer includes a quadrature phase transconductance stage coupled to a quadrature...
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7251466 |
Television receiver including an integrated band selection filter
A tuner circuit includes a band selection filter coupled to receive an input RF signal and provide a band selected output signal where the band selection filter includes a bank of band pass...
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