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    • 3. 发明授权
    • Frequency synthesizer with digitally-controlled oscillator
    • 具有数字控制振荡器的频率合成器
    • US06791422B2
    • 2004-09-14
    • US10679792
    • 2003-10-06
    • Robert B. StaszewskiDirk LeipoldKhurram MuhammadChih-Ming Hung
    • Robert B. StaszewskiDirk LeipoldKhurram MuhammadChih-Ming Hung
    • H03L700
    • H03C3/0975H03C3/0941H03C3/095H03C3/0958H03C3/0966H03K19/0016H03L7/085H03L7/087H03L7/091H03L7/093H03L7/099H03L7/16H03L2207/50H04L7/0029
    • A transmitter (10) based on a frequency synthesizer includes an LC tank (12) of a digitally controlled oscillator (DCO) with various arrays of capacitors. The LC tank 12 is divided into two major groups that reflect two general operational modes: acquisition and tracking. The first group (process/voltage/temperature and acquisition) approximately sets the desired center frequency of oscillation initially, while the second group (integer and fractional tracking) precisely controls the oscillating frequency during the actual operation. For highly accurate outputs, dynamic element matching (DEM) is used in the integer tracking controller to reduce non-linearities caused by non-uniform capacitor values. Also, a preferred range of the integer tracking capacitor array may be used for modulation after the selected channel has been acquired. A digital sigma-delta modulator circuit (50) drives a capacitor array (14d) in response to the fractional bits of the error word. On mode switches, the accumulated error is recalculated to a phase restart value to prevent perturbations.
    • 基于频率合成器的发射机(10)包括具有各种电容器阵列的数字控制振荡器(DCO)的LC箱(12)。 液相色谱箱12分为反映两种一般操作模式的两个主要组:采集和跟踪。 第一组(过程/电压/温度和采集)最初初始化设置所需的中心振荡频率,而第二组(整数和分数跟踪)在实际操作期间精确地控制振荡频率。 对于高精度输出,在整数跟踪控制器中使用动态元件匹配(DEM)来减少由非均匀电容值引起的非线性。 此外,在获取所选择的信道之后,整数跟踪电容器阵列的优选范围可以用于调制。 数字Σ-Δ调制器电路(50)响应错误字的分数位驱动电容器阵列(14d)。 在模式开关上,累加误差被重新计算到相位重启值,以防止扰动。
    • 8. 发明授权
    • Simultaneous multiple signal reception and transmission using frequency multiplexing and shared processing
    • 使用频率复用和共享处理的同时多信号接收和传输
    • US08542616B2
    • 2013-09-24
    • US12250646
    • 2008-10-14
    • Robert B. StaszewskiKhurram MuhammadDirk Leipold
    • Robert B. StaszewskiKhurram MuhammadDirk Leipold
    • H04L5/14
    • H04B1/0075H03D7/1441H03D7/1466H03D7/1483H03D7/165H03D2200/0025H03D2200/0047H03D2200/0074H03D2200/0084H03D2200/0088H04L5/06H04L5/143H04L27/3863H04L2027/0016
    • A novel mechanism for simultaneous multiple signal reception and transmission using frequency multiplexing and shared processing. Multiple RF signals, which may be of various wireless standards, are received using one or more shared processing blocks thereby significantly reducing chip space and power requirements. Shared components include local oscillators, analog to digital converters, digital RX processing and digital baseband processing. In operation, multiple RX front end circuits, one for each desired wireless signal, generate a plurality of IF signals that are frequency multiplexed and combined to create a single combined IF signal. The combined IF signal is processed by a shared processing block. Digital baseband processing is performed on each receive signal to generate respective data outputs. Further, simultaneous full-duplex transmission and reception is performed using a single local oscillator. The phase/frequency modulation of the frequency synthesizer used in the TX is removed from the local oscillator signal for use in the receiver.
    • 一种使用频率复用和共享处理同时进行多信号接收和传输的新颖机制。 可以使用一个或多个共享处理块来接收可能具有各种无线标准的多个RF信号,从而显着减少芯片空间和功率需求。 共享组件包括本地振荡器,模数转换器,数字RX处理和数字基带处理。 在操作中,针对每个期望的无线信号的多个RX前端电路产生频率多路复用并组合以产生单个组合IF信号的多个IF信号。 组合的IF信号由共享处理块处理。 对每个接收信号执行数字基带处理,以产生相应的数据输出。 此外,使用单个本地振荡器执行同时的全双工发送和接收。 在TX中使用的频率合成器的相位/频率调制从本地振荡器信号中去除,以在接收机中使用。
    • 9. 发明授权
    • Fine-grained gear-shifting of a digital phase-locked loop (PLL)
    • 数字锁相环(PLL)的细粒度换档
    • US08306176B2
    • 2012-11-06
    • US10464982
    • 2003-06-19
    • Robert B. StaszewskiDirk LeipoldKhurram Muhammad
    • Robert B. StaszewskiDirk LeipoldKhurram Muhammad
    • H03D3/24
    • H03L7/107H03L7/087H03L7/093H03L2207/50
    • System and method for improving a digital PLL's performance by making fine grained adjustments to the loop gain. A preferred embodiment comprises a plurality of loop gain adjustors (such as loop gain adjustors 605, 606, 607, and 608) that can incrementally adjust the loop gain. The incrementally adjusted loop gains are sequentially brought on-line so that the loop gain of the digital PLL is slowly decreased. By slowly decreasing the loop gain, the digital PLL is less perturbed by smaller noise transients that would take time to settle. Hence, the digital PLL can quickly acquire a signal and then decrease its loop gain and hence its bandwidth when it only needs to track a signal. The reduced bandwidth also reduces the overall noise in the digital PLL that is due to the reference noise contribution.
    • 通过对环路增益进行细微调整来提高数字PLL性能的系统和方法。 优选实施例包括可逐渐调节环路增益的多个环路增益调节器(例如环路增益调节器605,606,607和608)。 递增调节的环路增益被顺序地串联在一起,使得数字PLL的环路增益缓慢降低。 通过缓慢地减小环路增益,数字PLL不受较小的噪声瞬变扰动,这将需要一些时间来解决。 因此,数字PLL可以快速获取信号,然后在仅需要跟踪信号时减小其环路增益,从而降低其带宽。 降低的带宽也降低了由于参考噪声贡献而导致的数字PLL中的整体噪声。
    • 10. 发明授权
    • Removing close-in interferers through a feedback loop
    • 通过反馈回路消除紧密的干扰源
    • US08000670B2
    • 2011-08-16
    • US11339386
    • 2006-01-25
    • Robert B. StaszewskiKhurram MuhammadDirk Leipold
    • Robert B. StaszewskiKhurram MuhammadDirk Leipold
    • H04B1/06
    • H04B1/28H04B1/1036
    • System and method for elimination of close-in interferers through feedback. A preferred embodiment comprises an interferer predictor (for example, interferer predictor 840) coupled to a digital output of a direct RF radio receiver (for example, radio receiver 800). The interferer predictor predicts the presence of interferers and feeds the information back to a sampling unit (for example, sampling unit 805) through a feedback circuit (for example, feedback unit 845) through the use of charge sharing. The interferers are then eliminated in the sampling unit. Additionally, the number and placement of zeroes in a filter in the sampling unit is increased and changed through the implementation of arbitrary-coefficient finite impulse response filters.
    • 通过反馈消除接近干扰的系统和方法。 优选实施例包括耦合到直接RF无线电接收机(例如,无线电接收机800)的数字输出的干扰源预测器(例如,干扰源预测器840)。 干扰源预测器预测干扰源的存在,并且通过使用电荷共享通过反馈电路(例如,反馈单元845)将信息反馈给采样单元(例如,采样单元805)。 然后在采样单元中消除干扰源。 另外,通过执行任意系数有限脉冲响应滤波器来增加和改变采样单元滤波器中的零数和位置。