| Patent application number | Description | Published |
|---|
| 20090096653 | RF CHIP INCLUDING SHARED CONVERTER AND TRANSCEIVER INCLUDING THE RF CHIP - The invention generally relates to a radio frequency (RF) chip and/or a baseband chip for use in a wireless transmitter and/or receiver. Embodiments of the invention solve a problem caused by a mismatch in amplitude and/or phase between in-phase (I) and quadrature (Q) signals in such communication devices. According to an aspect of the invention, there is provided a communication device including: a baseband signal processing unit configured to output a plurality of analog baseband signals through a corresponding plurality of channels; and a radio frequency (RF) processing unit coupled to the plurality of channels, the RF processing unit configured to convert the plurality of analog baseband signals into a plurality of digital signals using a shared analog-to-digital converter (ADC), the RF processing unit further configured to generate an RF signal based on the plurality of digital signals. | 04-16-2009 |
| 20090191838 | MODE-SWITCHING LOW-NOISE AMPLIFIER AND WIDE-BAND RF RECEIVER - A mode-switching LNA generally includes an input unit, an output unit and a bias voltage generator. The input unit amplifies an input signal to generate an amplified signal. The output unit receives the amplified signal from the input unit and operates either in an oscillation mode or in an amplification mode in response to a control signal to generate an output signal having a center frequency equal to a target frequency. The control signal indicates whether the center frequency of the output signal is the same as the target frequency. The bias voltage generator provides an input bias voltage to the input unit in response to the control signal, where the input bias voltage includes a first bias voltage in the amplification mode and a second bias voltage in the oscillation mode. | 07-30-2009 |
| 20100066459 | Two-point phase modulator and method of calibrating conversion gain of the same - A two-point phase modulator and a method of calibrating conversion gain of the same are provided. The two-point phase modulator locks an output frequency signal by charging and pumping charge in a phase-locked loop (PLL) circuit at the beginning of operation, opens a loop of the PLL circuit for a period of time, and applies a step signal, thus calibrating conversion gain of a modulation signal that controls the output frequency signal. Thus, the conversion gain may be accurately calibrated by the calibration operation at one time. | 03-18-2010 |
| 20100225361 | FREQUENCY DIVIDER, FREQUENCY SYNTHESIZER AND APPLICATION CIRCUIT - A frequency divider includes a prescaler and multiple modulus dividers commonly coupled to the prescaler. The prescaler generates intermediate frequency signals having a same phase difference with respect to one another in response to an oscillation frequency signal. The prescaler operates at a first frequency. The modulus dividers respectively divide the intermediate frequency signals with respective ratio to provide a plurality of division frequency signals in response to a control signal. The modulus dividers operate at a second frequency less than the first frequency. | 09-09-2010 |
