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    • 8. 发明授权
    • Direct digital synthesizer driven phase lock loop frequency synthesizer
with clean up phase lock loop
    • 直接数字合成器驱动锁相环频率合成器,具有清理锁相环
    • US5757239A
    • 1998-05-26
    • US780472
    • 1997-01-08
    • Robert P. Gilmore
    • Robert P. Gilmore
    • H03L7/16H03L7/18H03L7/22H03L7/23H03K3/80
    • H03L7/22H03L7/1806H03L7/23
    • A frequency synthesizer which uses a direct digital synthesizer (DDS) to generate a highly accurate periodic signal of a frequency selected from a plurality of reference frequencies. The DDS output signal is bandpass filtered utilizing a clean-up phase lock loop (PLL) to produce a spectrally pure reference signal and promote overall fast settling time. A second or primary phase lock loop, having a much faster settling time than the first PLL, adjusts the frequency of the reference signal generated by the clean-up PLL. In one embodiment, the DDS frequency synthesizer has a digital to analog (DAC) converter coupled to the clean-up PLL. Another embodiment uses a modified DDS (without a DAC or lookup table) and feeds the most significant bit (MSB) or overflow bit from the DAC accumulator into the "clean-up" PLL. In both embodiments, the resulting synthesizer has high spectral purity, fine frequency resolution and a fast settling time. Yet another embodiment uses a switching apparatus to bypass the "clean-up" PLL while it is settling on a new frequency. Once the "clean-up" PLL settles on the new frequency the switches are set to couple the "clean-up" PLL back into the synthesizer apparatus.
    • 一种频率合成器,其使用直接数字合成器(DDS)来产生从多个参考频率中选择的频率的高度精确的周期信号。 使用清理锁相环(PLL)对DDS输出信号进行带通滤波,以产生光谱纯参考信号,并促进整体快速建立时间。 具有比第一PLL更快的建立时间的第二或主要锁相环调整由清理PLL产生的参考信号的频率。 在一个实施例中,DDS频率合成器具有耦合到清理PLL的数模转换器(DAC)转换器。 另一个实施例使用修改的DDS(没有DAC或查找表),并将来自DAC累加器的最高有效位(MSB)或溢出位馈送到“清理”PLL。 在两个实施例中,所得的合成器具有高光谱纯度,精细的频率分辨率和快速的建立时间。 另一个实施例使用开关装置来绕过“清理”PLL,同时在新频率上稳定。 一旦“清理”PLL固定在新频率上,则开关被设置为将“清理”PLL耦合回合成器装置。
    • 10. 发明授权
    • Signal separation for energy harvesting
    • 能量收集信号分离
    • US08611820B2
    • 2013-12-17
    • US12564767
    • 2009-09-22
    • Robert P. Gilmore
    • Robert P. Gilmore
    • H04B7/00
    • H04B1/3877H02J7/025H02J17/00H02J50/20H04M1/6066
    • Techniques for designing a communications unit including a signal separation module for energy harvesting. In an exemplary aspect, the signal separation module includes first and second quadrature hybrids coupled by band-pass filters (BPF's). Incoming signals within the pass-band of the BPF's are directed through the quadrature hybrids and through the BPF's, and emerge as a desired pass-band signal to be processed by an RX processing module. Incoming signals lying outside the pass-band of the BPF's are reflected from the BPF's back to the first quadrature hybrid, and output as a non-pass-band signal to be processed by an energy harvesting module. In a further exemplary aspect, the signal separation module resides in a detachable module coupleable to a wireless communications device, and a signal transmitted by the wireless communications device is coupled to the signal separation module for energy harvesting.
    • 用于设计包括用于能量收集的信号分离模块的通信单元的技术。 在示例性方面,信号分离模块包括通过带通滤波器(BPF)耦合的第一和第二正交混合。 BPF通带内的传入信号通过正交混合和通过BPF引导,并出现为要由RX处理模块处理的期望的通带信号。 位于BPF通带外的传入信号从BPF反射回第一正交混合,并作为非通带信号输出,由能量采集模块处理。 在另一示例性方面,信号分离模块驻留在可耦合到无线通信设备的可拆卸模块中,并且由无线通信设备发送的信号耦合到用于能量收集的信号分离模块。