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| Number | Title | Issue Date |
| 8055232 | Radio frequency receiving apparatus, radio frequency receiving method, LSI for radio frequency signal and LSI for base band signal A receiving apparatus may achieve optimal RF and IF gain control while suppressing saturated amplification due to interference. The receiving apparatus includes an RF variable gain Amp that amplifies a received RF signal, a mixer that converts an output signal of th... | 11/08/2011 |
| 7639998 | RF receiver utilizing dynamic power management A radio frequency (RF) receiver utilizing dynamic power management for administration of power consumption. The RF receiver includes an RF antenna, an RF full band filter, an RF amplifier, an RF sub-band filter, a first local oscillator, an RF mixer, a first IF ampl... | 12/29/2009 |
| 7580690 | High-frequency receiver having a gain switch controller A high-frequency receiver capable of improving both an interference-resistant characteristic and reception sensitivity is provided. A gain switch control unit includes: a signal level determination unit comparing a gain control voltage of an amplifying circuit with ... | 08/25/2009 |
| 7414676 | Integrated programmable tuner An integrated tuner is programmable to optimize its components for either analog signal reception or digital signal reception. Power to the components is increased for analog operation and decreased for digital operation. The tuner also includes a selectable and int... | 08/19/2008 |
| 7409189 | Calibration and testing architecture for receivers A method and apparatus are provided to generate calibration signals to multiple stages in a receiver channel. The multiple stages are calibrated using multiple calibration circuits, where a controller controls each calibration circuit. The controller is coupled to t... | 08/05/2008 |
| 7392028 | Radio receiver/transceiver including an interface circuit selectively operable in a current mode or a voltage mode A radio receiver is selectively operable in a current mode or a voltage mode according to conditions prevailing within a wireless environment. If the signal levels within the wireless environment are relatively low, the radio receiver is operable in current mode. If... | 06/24/2008 |
| 7389093 | Call method, call apparatus and call system A call apparatus, a call method and a call system, are disclosed, in which the problem otherwise caused by fixed setting of the sound volume level of the BGM or the effect sound with respect to the call voice may be overcome. A decoded output of a decoder 17 ... | 06/17/2008 |
| 7372925 | Wireless LAN receiver with I and Q RF and baseband AGC loops and DC offset cancellation A wireless local area network receiver having separate automatic gain control (AGC) loops for providing a radio frequency AGC and a baseband frequency AGC, as well as a DC offset cancellation circuit. The AGC loops control a low noise amplifier amplifying the receiv... | 05/13/2008 |
| 7366484 | Systems and methods for adjusting the bias level of a mixer in a transmitter A mixer having dynamic biasing, comprises a mixer configured to receive a local oscillator (LO) reference signal and a radio frequency (RF) data signal, and a bias control circuit configured to reduce bias current from the mixer under a low power condition. ... | 04/29/2008 |
| 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 respective amounts to derive a desired calibration tone frequency and a desir... | 04/22/2008 |
| 7353010 | Techniques for fast automatic gain control An automatic gain control (AGC) technique can quickly sense signal size over a large dynamic range by using a peak detector block in the analog portion of the receiver. The peak detector block can compare a received signal to predetermined thresholds (chosen to divi... | 04/01/2008 |
| 7324787 | Method of ramping up output level of power amplifier of radio communication system, communication semiconductor integrated circuit, and radio communication system In a radio communication system having a phase control loop for phase modulation and an amplitude control loop for amplitude modulation and being capable of time divisional transmission and reception under a predetermined time management, when transmission in a firs... | 01/29/2008 |
| 7292084 | Timer circuit with adaptive reference A timer circuit includes a current mirror, a capacitor, a first switch, a resistor and a comparator. The current mirror receives a reference current and provides first and second currents with a predefined current ratio. The capacitor receives the first current as a... | 11/06/2007 |
| 7280805 | LO leakage and sideband image calibration system and method A system or method for calibrating an RF transmitter includes inputting a test tone to the RF transmitter. LO leakage calibration is performed on an output of the RF transmitter with the test tone inputted thereto, in order to determine a minimum LO leakage. Thereaf... | 10/09/2007 |
| 7266354 | Reducing the peak-to-average power ratio of a communication signal Systems and methods are provided for reducing the peak to average ratio of signals, so that the signals can be amplified more efficiently. An error signal that corresponds to crests of the input signal is generated, and subtracted from the input signal. When a crest... | 09/04/2007 |
| 7260372 | GPS receiver with reflection amplifiers An AM receiver incorporates an antenna, a transistor, a current source, and a power supply. The antenna is connected to a gate electrode of the transistor and through a link to a signal earth. In operation, the antenna receives radiation and generates a correspondin... | 08/21/2007 |
| 7257178 | Base band circuit of receiver and low cut-off frequency control method A base band circuit of a receiver and a low cut-off frequency control means can quickly converge transition state due to gain fluctuation with setting a low cut-off frequency of a high-pass filter as low as possible. The base band circuit of a receiver has a variabl... | 08/14/2007 |
| 7257385 | Wireless communication semiconductor integrated circuit device and wireless communication system A receiving circuit of a direct conversion system is provided which includes a differential amplifier circuit which amplifies a received signal, a mixer which combines the amplified received signal and an oscillation signal having a predetermined frequency to thereb... | 08/14/2007 |
| 7257383 | Method and system for improving dynamic range for communication systems using upstream analog information The receiver is provided which comprises a mixer, a low pass filter coupled to the mixer and a plurality of gain controllers serially coupled to an output of the low pass filter (LPF). A plurality of analog-to-digital converters (ADCs) is coupled so that an input of... | 08/14/2007 |
| 7248625 | Compensation of I-Q imbalance in digital transceivers A transceiver includes a switching unit configurable for isolating an input of a receiver from an output of a transmitter during a local calibration mode. A known signal present at the output at a first power level during the calibration mode will also be present at... | 07/24/2007 |
| 7245894 | Radio receiver and radio signal processing method with controlling gain A radio receiver comprises a first amplifier to amplify a received radio signal; a quadrature demodulator to demodulate the radio signal amplified by said first amplifier and thereby generate a baseband signal; a second amplifier to amplify the baseband signal; a de... | 07/17/2007 |
| 7231195 | Variable gain control circuit and receiver apparatus using the circuit Disclosed is a variable gain control circuit for executing automatic-gain-control on a variable gain amplification block composed of a plurality of amplifiers on which discrete gain setting is executed by a programmable-gain-amp method. A baseband amplifier (a varia... | 06/12/2007 |
| 7221918 | Digital DC-offset correction circuit for an RF receiver An RF receiver comprising a radio-frequency (RF) down-converter for receiving and down-converting an input RF signal to a lower frequency analog signal (e.g., an IF signal or baseband signal) and analog processing circuitry for receiving the lower frequency analog s... | 05/22/2007 |
| 7221919 | Receiver circuit and radio communication terminal apparatus There are provided, as a low noise amplifier (70) a low noise amplifier (71) with a low gain and a low noise amplifier (72) with a high gain, selectively operable under control of a bias current, and an output from the low noise amplifier (72... | 05/22/2007 |
| 7212798 | Adaptive AGC in a wireless network receiver An apparatus, a carrier medium storing instructions to implement a method, and a method for controlling the gain of a radio receiver for receiving packets of information in a wireless network. The receiver is connected to an antenna subsystem and has receive signal ... | 05/01/2007 |
| 7194244 | Wireless communication receiver A wireless communication receiver that is able to lessen the effect of noise that accompanies gain change by programmable gain amplifiers. The receiver includes an AGC controller which controls the timing at which the programmable gain amplifiers make gain change, u... | 03/20/2007 |
| 7139540 | Adaptive radio transceiver with calibration An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 11/21/2006 |
| 7138843 | Timer circuit with adaptive reference A timer circuit includes a current mirror, a capacitor, a first switch, a resistor and a comparator. The current mirror receives a reference current and provides first and second currents with a predefined current ratio. The first switch, controlled by a control sig... | 11/21/2006 |
| 7130589 | Self-calibrating apparatus and method in a mobile transceiver An apparatus and method for self-calibrating mismatching orthogonal signals and non-linearity of a circuit occurring in a mobile transceiver. For this, in a mobile terminal, a transmitter is used as a signal generator and a receiver is used as a response characteris... | 10/31/2006 |
| 7120411 | Low noise amplifier (LNA) gain switch circuitry A circuit is formed to steer current in and out of an inductive load in a manner that enables an amplifier to provide a plurality of gain steps without modifying an LC time constant for the circuit and, therefore, without modifying the tuning or frequency of oscilla... | 10/10/2006 |
| 7120427 | CMOS wireless transceiver with programmable characteristics A monolithic radio integrated circuit includes a substrate, a set of one or more analog subcircuits on the substrate, a programmable bias current supply on the substrate coupled to the set to provide bias currents to the analog subcircuits of the set including progr... | 10/10/2006 |
| 7085587 | Signal processing semiconductor integrated circuit device and wireless communication system Disclosed herein is a direct conversion type signal processing semiconductor integrated circuit device capable of suppressing a DC voltage variation in the output of a variable gain amplifier upon the transition to a reception mode, reproducing stable receiving char... | 08/01/2006 |
| 7076224 | Process for controlling the gain of a frequency tuner, and corresponding tuner, in particular for the reception of terrestrial digital television signals A method and device are disclosed for receiving digital television signals by a frequency tuner. The power of the signal is measured after an analog/digital conversion in the frequency tuner, and the gain thereof is controlled on the basis of this power measurement ... | 07/11/2006 |
| 7065165 | Automatic gain control methods and apparatus suitable for use in OFDM receivers Automatic gain control (AGC) methods and apparatus suitable for use in orthogonal frequency division multiplexing (OFDM) receivers are described. One AGC method includes the steps of repeatedly performing a first AGC process which adjusts amplifier gain based on det... | 06/20/2006 |
| 7054605 | Variable-gain low noise amplifier to reduce linearity requirements on a radio receiver Variable gain low noise amplifier (LNA) system to reduce linearity requirements on a radio receiver. In the receiver, the LNA is coupled to receive an RF signal and produce an amplified signal at an LNA output. The receiver also comprises a VGA coupled to the LNA ou... | 05/30/2006 |
| 7054598 | High speed digital received signal strength indicator circuit A high-speed digital received signal strength indicator (RSSI) circuit is provided. The high speed digital RSSI circuit includes an amplifying unit which includes a plurality of amplifiers connected in series for amplifying a received signal through multiple stages,... | 05/30/2006 |
| 7050774 | AGC circuit of an FM receiver that reduces interference while maintaining high reception sensitivity A first AGC voltage and a second AGC voltage are taken from the final stage of a radio-frequency circuit and the output side of a bandpass filter, respectively, and the gain of the radio-frequency circuit is controlled on the basis of the two AGC voltages. The pass-... | 05/23/2006 |
| 7027793 | Direct conversion with variable amplitude LO signals Techniques to reduce LO leakage by controlling the amplitude of LO signal based on the level of output signal after the frequency conversion process. An LO generator receives a VCO signal and generates an LO signal having a variable amplitude and a frequency that is... | 04/11/2006 |
| 7010330 | Power dissipation reduction in wireless transceivers Methods and circuits for reducing power dissipation in wireless transceivers and other electronic circuits and systems. Embodiments of the present invention use bias current reduction, impedance scaling, and gain changes either separately or in combination to reduce... | 03/07/2006 |
| 7010284 | Wireless communications device including power detector circuit coupled to sample signal at interior node of amplifier A multi-stage amplifier is coupled with a power detector. The multi-stage amplifier includes a plurality of amplifier stages in series, with a signal path extending through them. The power detector is coupled to an interior node of the amplifier along the signal pat... | 03/07/2006 |
