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| Number | Title | Issue Date |
| 8150350 | Adaptive IIP2 calibration A radio frequency transceiver (102), including a transmitter (104), a duplexer (108) and a direct-conversion receiver (106) including a mixer (140 and 141). An IIP2 calibration system (170), coupled to the transceiver... | 04/03/2012 |
| 8099070 | Passive mixer and four phase clocking method and apparatus According to one embodiment, a radio frequency receiver includes a quadrature mixer for converting radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer includes an in-phase passive mixer and a quadrature-phase passive m... | 01/17/2012 |
| 8055225 | FM receiver An arctangent detector according to the present invention generates a demodulated signal based on the result of arctangent calculation of the ratio between an in-phase component and a quadrature component obtained from a frequency modulation (FM) received signal tha... | 11/08/2011 |
| 7885624 | Filter switching system and method A communication system with variable filter bandwidth includes a first mixer circuit configured to receive a communication signal and shift the frequency range of the communication signal to a first frequency range. A second mixer circuit is configured to receive th... | 02/08/2011 |
| 7634243 | System and method for providing a dual conversion tuner having a first IF filter without fixed center frequency Disclosed are systems and methods which utilize a relatively low cost first IF filter in a dual conversion tuner circuit. A preferred embodiment first IF filter is provided using a filter arrangement having a relatively high tolerance. Accordingly, preferred embodim... | 12/15/2009 |
| 7555273 | Bandpass filter with carrier frequency reduction A bandpass filtering method in which two frequency transpositions are performed in parallel on an input signal (SE) for filtering using respective first and second upstream mixing signals (SM1, SM2). A common oscillator (LO) is used which is coupled wi... | 06/30/2009 |
| 7409199 | Direct conversion receiver with DC offset compensation A direct conversion receiver includes a mixer for converting an RF signal into a baseband signal, a dynamic DC offset compensator for compensating for a dynamic DC offset caused by the effect of second order nonlinear distortion of the mixer on an interfering wave t... | 08/05/2008 |
| 7406301 | Modulation-demodulation apparatus and wireless communication apparatus A modulation-demodulation apparatus of a relatively simple arrangement is able to prevent a bad influence caused due to interference between two local oscillators and a portable wireless communication apparatus uses this modulation-demodulation apparatus. In a modul... | 07/29/2008 |
| 7389101 | Use of analog-valued floating-gate transistors for parallel and serial signal processing Analog-valued floating-gate transistors are used as trimmable circuit components for modifying and/or controlling the gain, phase, offset, frequency response, current consumption, and/or transfer function of signal pathways in parallel and/or serial processing circu... | 06/17/2008 |
| 7376403 | Terahertz radiation mixer A terahertz radiation mixer comprises a heterodyned field-effect transistor (FET) having a high electron mobility heterostructure that provides a gatable two-dimensional electron gas in the channel region of the FET. The mixer can operate in either a broadband pinch... | 05/20/2008 |
| 7369837 | Frequency-mixing method and frequency-mixing device using the same A frequency-mixing method includes a step of generating a first quadrature signal having a predetermined frequency, a second quadrature signal having a phase difference of about 180 degrees with respect to a phase of the first quadrature signal, a third quadrature s... | 05/06/2008 |
| 7356318 | Quadrature subharmonic mixer A quadrature subharmonic mixer comprises a polyphase filter configured to generate quadrature components of a local oscillator (LO) reference signal, a summing and scaling element configured to create additional components of the LO reference signal, and a plurality... | 04/08/2008 |
| 7352991 | Satellite signal distribution systems Various configurations and equipment are described for providing satellite television programming from multiple satellite antennas to receivers, particularly to receivers located in apartments within a multiple-dwelling unit and having one or more satellite televisi... | 04/01/2008 |
| 7349679 | Integrated power amplifier A power amplifier develops a modulated high power signal by summing the outputs of multiple voltage controlled oscillators. A phase control circuit synchronizes the phase relationship of multiple voltage controlled oscillators. The voltage control oscillators provid... | 03/25/2008 |
| 7343015 | Method and apparatus for high fidelity wireless stereophonic transmission utilizing dual frequency carriers A method and system is disclosed for transmitting two related channels of signals through the air. A first channel of signals is modulated with a first carrier frequency, and a second channel of signals is modulated with a second carrier frequency. The modulated fir... | 03/11/2008 |
| 7340232 | Receiving system and semiconductor integrated circuit device for processing wireless communication signal The invention provides a receiving system and a transmitting system capable of decreasing an offset between differential signals and between quadrature signals and improving a manufacturing yield and a semiconductor integrated circuit device for processing a wireles... | 03/04/2008 |
| 7340233 | Integrated circuit and methods for third sub harmonic up conversion and down conversion of signals An integrated circuit may include a receiver and/or a transmitter that performs third order sub-harmonic conversion. The integrated circuit may include a Gilbert cell active mixer with three or more serially-connected transistors in each of the mixer's four branches... | 03/04/2008 |
| 7327994 | Architecture for multiple-antenna systems The invention is a system and method for sharing components of a single-path receiver or transmitter system multiple antennas. Specifically, according to one embodiment of the present invention, multiple antennas simultaneously share an analog-to-digital converter u... | 02/05/2008 |
| 7324797 | Bragg-cell application to high probability of intercept receiver A unique ultra wide band receiver is provided that blends together RF and photonic technologies. The receiver has application as a steering mechanism (600) for a much higher resolution receiver. Some implementations can provide at least four times shorter sca... | 01/29/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof 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 signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7292832 | Timing and frequency control method and circuit for digital wireless telephone system terminals A wireless terminal circuit includes a variable high frequency clock oscillator that provides a high frequency clock signal and a fixed low frequency clock oscillator that provides a low frequency clock signal. A phase-locked loop adjusts a ratio of the frequency of... | 11/06/2007 |
| 7280618 | Digital baseband receiver including a high pass filter compensation module for suppressing group delay variation distortion incurred due to analog high pass filter deficiencies A digital baseband (DBB) radio frequency (RF) receiver includes a digital high pass filter compensation (HPFC) module used to suppress group delay variation distortion caused by using low cost analog high pass filters (HPFs) in the receiver. The digital HPFC module ... | 10/09/2007 |
| 7277683 | Regenerative divider for up and down conversion of radio frequency (RF) signals The present invention relates generally to communications, and more specifically to a method and apparatus for generating local oscillator signals used for up- and down-conversion of RF (radio frequency) signals. A major problem in the design of modulators and demod... | 10/02/2007 |
| 7272373 | Ratiometric clock systems for integrated receivers and associated methods A ratiometric clock system for an integrated receiver and associated method are disclosed that provide an advantageous solution for combining digital signal processing (DSP) circuitry on the same integrated circuit as mixer and local oscillator (LO) generation circu... | 09/18/2007 |
| 7272374 | Dynamic selection of local oscillator signal injection for image rejection in integrated receivers A system and method are disclosed for dynamically selecting high-side injection or low-side injection of local oscillator mixing signals based upon an assessment of signal power within the input signal spectrum that could cause unwanted images in the processed signa... | 09/18/2007 |
| 7272370 | Mixers with a plurality of local oscillators and systems based thereon A receiver apparatus including a main input for receiving the input signal and a first standard mixer having a first mixer input, a first local oscillator input, and a first mixer output. The first mixer input is connected to the main input and the first local oscil... | 09/18/2007 |
| 7266352 | Multiple band RF transmitters and receivers having independently variable RF and IF local oscillators and independent high-side and low-side RF local oscillators Multistage RF transmitter and receiver circuits may use independently variable RF and IF local oscillators, allowing the RF and IF local oscillator frequencies for a given RF channel to be selected to have a large common factor with respect to the reference oscillat... | 09/04/2007 |
| 7253701 | Multiplexed amplifier Multiple sensor signals are used to modulate an equal number of frequency-spaced carrier signals in a directional parametric upconverting amplifier. Basically, the carrier signals are separated in a cascaded or parallel configuration of narrow frequency passbands, w... | 08/07/2007 |
| 7251465 | Method and apparatus for producing mobile radio signals A method and device are provided for producing mobile radio signals, which utilize a direct conversion receiver, at least one first and one second local oscillator and one regenerative divider for processing signals according to different mobile radio standards. For... | 07/31/2007 |
| 7250887 | System and method for spur cancellation A system for spur cancellation comprises an input, an output, a memory, and a summer. A value corresponding to an energy level of a spur is stored in the memory. The summer is configured to receive an input signal from the input, to receive the value from the memory... | 07/31/2007 |
| 7251461 | Wireless communications system, wireless transmitter, and wireless receiver This invention includes a wireless transmitter comprising an IF-signal generator that modulates input signals into those of an intermediate frequency band, signal distributors that distribute signals from the IF-signal generator, and a plurality of signal-transmissi... | 07/31/2007 |
| 7245885 | Device for compensating for a mismatch of a transmitter and a method of compensating for the mismatch A device for compensating for a mismatch of a transmitter and a method of compensating for the mismatch is provided. The device for compensating for a mismatch of an up-converter in a direct conversion transmitter, comprises: a mismatch compensating unit for compens... | 07/17/2007 |
| 7245892 | Satellite reception A typical satellite reception system comprises a satellite dish, a low noise block (LNB) and a satellite receiver. The low noise block converts the received signals into lower frequency signals which are fed to the satellite receiver. It is now becoming increasingly... | 07/17/2007 |
| 7236762 | Direct-conversion receiver system and method, especially a GPS receiver system with high pass filtering The invention relates to a direct conversion receiver and a method in a direct conversion receiver for processing received radio signals that are modulated and centered at a carrier frequency, the modulation extending a sideband above and below the carrier frequency... | 06/26/2007 |
| 7224750 | Apparatus and method for receiving RF signal free of 1/f noise in radio communication system An apparatus and method for receiving RF signals in a RF communication system are provided. The apparatus for receiving RF signals comprises a pre-processing unit for bandpass-filtering a signal received through an external antenna with a predetermined bandwidth and... | 05/29/2007 |
| 7196738 | Tuner integrated circuit and television tuner using the same circuit One embodiment of a tuner integrated circuit includes two mixer circuits, an IF amplifier circuit, three oscillation circuits, a PLL circuit, and a reference oscillation circuit. A plurality of terminals are provided at two sides of the tuner integrated circuit and ... | 03/27/2007 |
| 7190941 | Method and apparatus for reducing DC offsets in communication systems using universal frequency translation technology Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnet... | 03/13/2007 |
| 7187904 | Frequency translating repeater with low cost high performance local oscillator architecture A frequency translating repeater (120) for use in a time division duplex (TDD) radio protocol communications system includes local oscillator (LO) circuits (210, 310, and 410) to facilitate repeating by providing isolation, reduced phase noise, ... | 03/06/2007 |
