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    • 62. 发明申请
    • FAST-LOCKING FREQUENCY SYNTHESIZER
    • 快速锁定频率合成器
    • WO2017053640A1
    • 2017-03-30
    • PCT/US2016/053213
    • 2016-09-23
    • SECOND SOUND LLC
    • KACZYNSKI, Brian, J.
    • H03B21/00
    • H03L7/0992G06F1/022H03L7/091
    • Methods and digital circuits providing frequency correction to frequency synthesizers are disclosed. An FLL digital circuit is provided that is configured to handle a reference frequency that is dynamic and ranges over a multi-decade range of frequencies. The FLL circuit includes a digital frequency iteration engine that allows for detection of disappearance of a reference frequency. When the digital frequency iteration engine detects that the reference frequency signal is not available, the oscillator generated frequency is not corrected, and the last value of the oscillator generated frequency is held until the reference frequency signal becomes available again.
    • 公开了向频率合成器提供频率校正的方法和数字电路。 提供FLL数字电路,其被配置为处理动态的参考频率并且在多十个频率范围内范围。 FLL电路包括允许检测参考频率消失的数字频率迭代引擎。 当数字频率迭代引擎检测到参考频率信号不可用时,振荡器产生的频率不被校正,并且保持振荡器产生频率的最后一个值,直到参考频率信号再次可用。
    • 63. 发明申请
    • REGENERATIVE FREQUENCY MULTIPLIER
    • 再生频率乘法器
    • WO2015088640A1
    • 2015-06-18
    • PCT/US2014/060287
    • 2014-10-13
    • RAYTHEON COMPANY
    • PATRIZI, Michael
    • H04B1/40H03B21/00
    • H03B19/00H03K5/00006H04B1/403
    • A technology is provided for generating an output frequency. An input signal with a defined frequency may be received. The input signal may be split so that a first signal with the defined frequency of the input signal is received at a frequency multiplier and a second signal with the defined frequency of the input signal is received at a frequency mixer. The first signal may be multiplied by N, wherein N is a predefined integer. The first signal may be limited to a predetermined frequency and passed to the frequency mixer. The first signal and the second signal may be mixed to produce at least two mixed signals. A first output signal and a second output signal may be generated based on the at least two mixed signals.
    • 提供了一种产生输出频率的技术。 可以接收具有定义频率的输入信号。 可以将输入信号分离,使得具有定义的输入信号频率的第一信号在倍频器处被接收,并且在频率混合器处接收具有定义的输入信号频率的第二信号。 第一信号可以乘以N,其中N是预定义的整数。 第一信号可以被限制到预定频率并被传送到混频器。 可以混合第一信号和第二信号以产生至少两个混合信号。 可以基于至少两个混合信号来生成第一输出信号和第二输出信号。
    • 65. 发明申请
    • DIRECT DIGITAL FREQUENCY SYNTHESIS ENABLING SPUR ELIMINATION
    • 直接数字频率综合法消除某些寄生虫
    • WO00055973A3
    • 2000-12-28
    • PCT/US2000/006757
    • 2000-03-16
    • H03B28/00H03C3/09H03L7/08H03L7/085H03L7/089H03L7/18H03B21/00H03L7/16
    • H03C3/0991H03C3/0933H03C3/0941H03C3/095H03C3/0966H03L7/085H03L7/0891H03L7/1806
    • The present invention, generally speaking, provides improved methods of generating clean, precisely-modulated waveforms, at least partly using digital techniques. In accordance with one aspect of the invention, a "difference engine" is provided that produces a digital signal representing the frequency error between a numeric frequency and an analog frequency. The frequency error may be digitally integrated to produce a digital signal representing the phase error. The difference engine may be incorporated into a PLL, where the analog frequency is that of an output signal of a VCO of the PLL. Direct modulation of the PLL output signal may be performed numerically. By further providing an auxiliary modulation path and performing calibration between the direction modulation path and the auxiliary modulation path, modulation characteristics may be separated from loop bandwidth constraints. In particular, the loop bandwidth of the PLL may be made so low as to reduce spurs (usually associated with DDS techniques) to an arbitrarily low level. A loop filter of the PLL may be realized in digital form. Using a digital loop filter would ordinarily require use of a high-resolution DAC. Various techniques are described for reducing the resolution requirements of the DAC.
    • 本发明一般涉及用于产生精确调制的清洁波的改进方法,至少部分地归功于数字技术。 根据本发明的一个方面,使用“对比度引擎”来产生代表数字频率和模拟频率之间的频率误差的数字信号。 该频率误差可以数字积分以产生代表相位误差的数字信号。 对比度引擎可以集成在PLL环路中,其中模拟频率是PLL的压控振荡器(VCO)的输出信号的频率。 PLL回路的输出信号的直接调制可以用数字来完成。 通过使用辅助调制路径并在感测调制路径和辅助调制路径之间执行校准,可以克服环路相对于调制特性的带宽限制。 具体而言,可以将PLL的带宽缩小到可以将噪声(通常与直接数字合成(DDS)技术相关联)降低到任意低水平的程度。 PLL回路的环路滤波器可以以数字形式实现。 使用数字环路滤波器通常需要使用高分辨率DAC。 本发明涉及用于降低分类器的分辨率要求的各种技术。
    • 66. 发明申请
    • FREQUENCY SYNTHESIS CIRCUIT TUNED BY DIGITAL WORDS
    • 数字频段调谐频率合成电路
    • WO99038252A1
    • 1999-07-29
    • PCT/US1999/000873
    • 1999-01-14
    • H03B21/00H03B28/00H03L7/06H03L7/081H03L7/16H03L7/18
    • H03L7/0812H03B28/00H03L7/16
    • A direct digital frequency synthesizer featuring a modulo accumulator (17; 117) addressing a multiplexer (33; 133). The multiplexer receives a series of delay signals generated from digital circuits (41-45; 141-153). The delay signals establish the phase of a reference oscillator (37; 137). The number of units of delay are sufficient to resolve expected jitter. The accumulator is a digital counter which increments by only a single digit for each count, such as a Gray code counter. In one embodiment, the delay signals are generated by a charge pump (43; Fig. 5) feeding individual logic circuits (41; Figs. 3-4) driving integrated capacitors in a loop. Feedback to the charge pump establishes that the total delay will subdivide a single clock cycle of the reference clock. In a second embodiment, a single shifter or several shifters (151; 153), with output in phase reversal relation (145), subdivide a single clock cycle. A clock multiplier (141) and divider (147) are used to assure the synchronism of each clock cycle with the total number of units of delay. The output (33; 155) of the multiplexer (33; 133) is the reference oscillator signal, adjusted by the phase delay, forming a synthesized output frequency.
    • 一种直接数字频率合成器,其特征在于寻址多路复用器(33; 133)的模累加器(17; 117)。 多路复用器接收从数字电路(41-45; 141-153)产生的一系列延迟信号。 延迟信号建立参考振荡器(37; 137)的相位。 延迟单位的数量足以解决预期的抖动。 累加器是一个数字计数器,每个计数器只增加一个数字,例如格雷码计数器。 在一个实施例中,延迟信号由馈送各个逻辑电路(41;图3-4)的电荷泵(43;图5)产生,该循环驱动集成电容器。 对电荷泵的反馈确定总延迟将细分参考时钟的单个时钟周期。 在第二实施例中,具有输出相位反转关系(145)的单个移位器或多个移位器(151; 153)细分单个时钟周期。 使用时钟乘法器(141)和分频器(147)来确保每个时钟周期与延迟单元总数的同步。 多路复用器(33; 133)的输出(33; 155)是由相位延迟调整的参考振荡器信号,形成合成输出频率。
    • 70. 发明申请
    • METHOD AND APPARATUS FOR FREQUENCY SYNTHESIS
    • 用于频率合成的方法和装置
    • WO2006039093A1
    • 2006-04-13
    • PCT/US2005/032542
    • 2005-09-12
    • MOTOROLA, INC.GABATO, Manuel, P., Jr.CHARASKA, Joseph, A.GAILUS, Paul, H.
    • GABATO, Manuel, P., Jr.CHARASKA, Joseph, A.GAILUS, Paul, H.
    • H03B21/00
    • H03L7/0812H03K5/1504H03K2005/00032H03L7/07H03L7/16
    • A DPC (200) that includes: a frequency source (20); a delay-locked loop (220) for receiving a clock signal and generating a plurality of phase-shifted clock signals; a control device (280) having a DPS (282) and a DAC (284) for receiving an input signal identifying a desired frequency for a synthesized signal; a selection circuit (270) for receiving the plurality of phase-shifted clock signals, selecting a sequence of the phase-shifted clock signals and outputting a coarse synthesized signal; a variable delay cell (290) having a first input coupled to the selection circuit to receive the coarse synthesized signal and a second input coupled to the control device for receiving a fine tune adjustment signal to modify the coarse synthesized signal to generate the synthesized signal (292) having substantially the desired frequency. The DPC further includes training apparatus for calibrating the DPC.
    • DPC(200),其包括:频率源(20); 延迟锁定环路(220),用于接收时钟信号并产生多个相移时钟信号; 具有DPS(282)和DAC(284)的控制装置(280),用于接收标识合成信号的期望频率的输入信号; 选择电路(270),用于接收多个相移时钟信号,选择相移时钟信号的序列并输出粗略的合成信号; 可变延迟单元(290),其具有耦合到选择电路以接收粗略合成信号的第一输入和耦合到控制装置的第二输入,用于接收微调调整信号以修改粗合成信号以产生合成信号 292)具有基本上所需的频率。 DPC还包括用于校准DPC的训练装置。