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    • 3. 发明申请
    • AN INTEGRATED WIRELESS RECEIVER AND A WIRELESS RECEIVING METHOD THEREOF
    • 一体化无线接收机及其无线接收方法
    • WO2006055821A3
    • 2006-08-24
    • PCT/US2005041922
    • 2005-11-18
    • GCT SEMICONDUCTOR INCPARK JOONBAELEE SEUNG-WOOKLEE JEONG-WOOLEE KYEONGHO
    • PARK JOONBAELEE SEUNG-WOOKLEE JEONG-WOOLEE KYEONGHO
    • H04B1/04
    • H04B1/26
    • A wireless receiver and a wireless receiving method are provided wherein a frequency of a radio frequency (RF) is down-converted into a frequency of a substantially zero intermediate frequency (IF) signal or a substantially low IF signal. The down-converted signal may be filtered by an integrated filter having a low quality factor and then up-converted again into a particular IF signal, thereby integrating an external element. For example, a receiving device may receive a RF signal in a required band. A frequency down-converting device may down-convert a frequency so that a center frequency of the RF signal becomes zero. A channel select filtering device may select a required channel from the signals whose frequency is down-converted. An IF signal converting device may up-convert a frequency of the channel selected signal into a required IF. An IF processing device may extract a baseband signal after the converted IF signal is inputted and processed. An amplifying device may amplify a signal with a gain required in a process of converting a frequency.
    • 提供了一种无线接收机和无线接收方法,其中射频(RF)的频率被下变频成基本为零的中频(IF)信号或基本上低的IF信号的频率。 下变频信号可以由具有低质量因子的积分滤波器滤波,然后再次上变频成特定的IF信号,从而整合外部元件。 例如,接收设备可以接收所需频带中的RF信号。 降频转换装置可以降频转换频率,使得RF信号的中心频率变为零。 频道选择滤波装置可以从频率被下变频的信号中选择所需频道。 IF信号转换装置可以将频道选择信号的频率上变频成所需的IF。 IF处理装置可以在转换的IF信号被输入和处理之后提取基带信号。 放大装置可以放大具有在转换频率的过程中所需的增益的信号。
    • 6. 发明申请
    • SYSTEM AND METHOD FOR SUPPRESSING NOISE IN A PHASE-LOCKED LOOP CIRCUIT
    • 用于抑制锁相环电路中的噪声的系统和方法
    • WO2004040898A3
    • 2004-09-02
    • PCT/US0333709
    • 2003-10-23
    • GCT SEMICONDUCTOR INCAHN YOUNGHOSONG EUNSEOKKOO YIDOLEE JEONG-WOOPARK JOONBAELEE KYEONGHO
    • AHN YOUNGHOSONG EUNSEOKKOO YIDOLEE JEONG-WOOPARK JOONBAELEE KYEONGHO
    • H03L7/197H03L7/06
    • H03L7/1978
    • A system and method for improving the signal-to-noise ratio of a frequency generator suppresses phase noise and noise generated from mismatches in the internal generator circuits. This is accomplished using a modulation scheme which shifts spurious noise signals outside the loop bandwidth of the generator. When shifted in this manner, the noise signals may be removed entirely or to any desired degree using, for example, a filter located along the signal path of the generator. In one embodiment, a Sigma-Delta modulator controls the value of a pulse-swallow frequency divider situated along a feedback path of a phase-locked loop to achieve a desired level of noise suppression. In another embodiment, a reference signal input into a phase-locked loop is modulated to effect noise suppression. In another embodiment, the foregoing forms of modulation are combined to accomplish the desired frequency shift. Through these modulation techniques, the signal-to-noise ratio of the frequency generator may be substantially improved while simultaneously achieving faster lock times.
    • 用于改善频率发生器的信噪比的系统和方法抑制了由于内部发生器电路中的失配而产生的相位噪声和噪声。 这是利用调制方案实现的,该调制方案将发生器的环路带宽之外的寄生噪声信号移位。 当以这种方式移动时,噪声信号可以使用例如沿着发生器的信号路径定位的滤波器被完全移除或以任何期望的程度移除。 在一个实施例中,Σ-Δ调制器控制沿着锁相环路的反馈路径设置的脉冲吞咽分频器的值,以实现期望的噪声抑制水平。 在另一个实施例中,输入到锁相环中的参考信号被调制以实现噪声抑制。 在另一个实施例中,上述形式的调制被组合以实现期望的频移。 通过这些调制技术,频率发生器的信噪比可以显着提高,同时实现更快的锁定时间。