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    • 85. 发明申请
    • High agility frequency synthesizer phase-locked loop
    • 高灵敏度频率合成器锁相环
    • US20050227629A1
    • 2005-10-13
    • US10821531
    • 2004-04-09
    • Akbar AliJames Young
    • Akbar AliJames Young
    • H03L7/22H04B1/38
    • H03L7/22
    • A highly agile low phase noise frequency synthesizer is provided for rapid generation of frequency specific signals. The frequency synthesizer is capable of rapidly generating signals at different output frequencies while maintaining low cross-coupling. Two or more signal generators utilize a reference frequency to generate two or more signals. These signals are limit processed to reduce cross-coupling prior to being presented to a switch. Responsive to a control signal, the switch outputs one of the signals to a frequency modification device, such as a frequency divider or multiplier. Responsive to a control signal, the frequency modification device scales the frequency of the switch output to convert the frequency of the switch output signal to a desired output frequency. By maintaining sufficient frequency separation between the switch input signals cross-coupling and phase noise is minimized and implementation on an integrated circuit may be achieved.
    • 提供了一种高灵敏度的低相位噪声频率合成器,用于快速产生频率特定信号。 频率合成器能够在保持低交叉耦合的同时快速产生不同输出频率的信号。 两个或更多个信号发生器利用参考频率来产生两个或更多个信号。 这些信号被限制处理,以便在呈现给开关之前减少交叉耦合。 响应于控制信号,开关将一个信号输出到频率修改装置,例如分频器或乘法器。 响应于控制信号,频率修改装置缩放开关输出的频率,以将开关输出信号的频率转换为期望的输出频率。 通过在开关输入信号之间保持足够的频率间隔,交叉耦合和相位噪声被最小化,并且可以实现集成电路上的实现。
    • 86. 发明申请
    • Master-Slave Local Oscillator Porting Between Radio Integrated Circuits
    • 主从本地振荡器在无线电集成电路之间移动
    • US20050064892A1
    • 2005-03-24
    • US10707312
    • 2003-12-04
    • Mark Cavin
    • Mark Cavin
    • H03L7/07H03L7/22H03L7/23H04B1/28H04M1/00
    • H03L7/07H03L7/22H03L7/23
    • A technique to share a local oscillator signal between two radio frequency integrated circuits (RFICs). The local oscillator signal generated internally by one RFIC is ported to the other RFIC for use in transmit and/or receive operation. The local oscillator signal that is ported may be an RF local oscillator signal. Each RFIC may include a bi-directional port circuit that can be operated to make the RFIC a master, slave or may be totally disabled to disable the porting feature. This is particularly useful in RFICs that are used to communicate using MIMO radio algorithms which rely for optimum performance on phase and frequency coherency among a plurality of transmitters and a plurality of receivers.
    • 一种在两个射频集成电路(RFIC)之间共享本地振荡器信号的技术。 由一个RFIC内部产生的本地振荡器信号被移植到另一个RFIC,用于发送和/或接收操作。 被移植的本地振荡器信号可以是RF本地振荡器信号。 每个RFIC可以包括双向端口电路,其可以被操作以使RFIC成为主机,从机或可以完全禁用以禁用移植特征。 这在用于使用MIMO无线电算法进行通信的RFIC中特别有用,所述MIMO无线电算法依赖于多个发射机和多个接收机之间的相位和频率一致性的最佳性能。
    • 88. 发明申请
    • Phase lock for synthesizer phase reference oscillator
    • 合成器相位基准振荡器的锁相
    • US20040207477A1
    • 2004-10-21
    • US10421236
    • 2003-04-21
    • Linley F. Gumm
    • H03B001/00
    • H03L7/22H03L2207/10H03L2207/12
    • A phase lock for a synthesizer phase reference oscillator that is used in conjunction with a conventional DDS circuit to synthesize an RF output frequency includes a second DDS circuit that is added with a reference increment value as an input to provide a phase offset frequency. A frequency/phase comparator compares a frequency reference oscillator output with the phase offset frequency to generate a control signal for phase locking the phase reference oscillator to the frequency reference oscillator. To determine the correct value for the reference increment value, a switch is provided between the frequency/phase comparator and the phase reference oscillator and the control signal is input to an analog-to-digital converter. During a nullturn onnull procedure the resulting digitized control signal is observed by a control system as the reference increment value is adjusted until a slow ramp, positive or negative, in the control signal is observed. Then the switch is closed to allow the control signal to phase lock the phase reference oscillator coherently to the frequency reference oscillator. In this way coherence is achieved from unit to unit with a more precise frequency output.
    • 与常规DDS电路结合使用以合成RF输出频率的合成器相位基准振荡器的锁相包括添加有参考增量值作为输入以提供相位偏移频率的第二DDS电路。 频率/相位比较器将频率参考振荡器输出与相位偏移频率进行比较,以产生用于将相位参考振荡器锁相到频率参考振荡器的控制信号。 为了确定参考增量值的正确值,在频率/相位比较器和相位参考振荡器之间提供开关,并且控制信号被输入到模数转换器。 在“打开”程序期间,由于控制系统观察到所得到的数字化控制信号,因为调整参考增量值,直到观察到控制信号中的缓慢斜坡正或负。 然后开关闭合,以允许控制信号将相位参考振荡器相位锁定到频率参考振荡器。 以这种方式,通过单位到单位实现更精确的频率输出的一致性。
    • 90. 发明授权
    • Vector network measurement system
    • 矢量网络测量系统
    • US06529844B1
    • 2003-03-04
    • US09389768
    • 1999-09-02
    • Peter KapetanicJon MartensDavid Rangel
    • Peter KapetanicJon MartensDavid Rangel
    • G01R3500
    • G01R23/20G01R27/32H03L7/22
    • A vector network analyzer (VNA) is provided with three test ports and an integration of hardware and software to make an integrated set of measurements for two and three port devices. The integrated capability allows for fast, versatile measurements that benefits, in accuracy and convenience, from sharing of data and resources with other measurements. The VNA includes a first signal source which is selectively connectable through reflectometers to two of the three VNA test ports. A second signal source provides connection through a third reflectometer to a third test port to enable full vector error corrected 3-port S-parameters measurements to be made. The two signal sources, along with software configuration of the VNA to operate in a non-ratioed mode provides for measuring second and third order intercept measurements. The two signal sources and software also enable the VNA to be used to make frequency translation measurements of a mixer including accurate frequency translation group delay measurements. The VNA further includes components to enable DUT noise figure to be determined, and to provide automatic calibration. The VNA further provides a process for harmonic measurement accuracy enhancement, and includes a dual mode multiple source/LO module to provide common mode noise rejection and fast measurement speed.
    • 矢量网络分析仪(VNA)提供三个测试端口,并集成了硬件和软件,以便为两个和三个端口设备进行一整套测量。 集成功能允许快速,多功能的测量,在精确性和便利性方面有利于与其他测量数据和资源共享。 VNA包括可以通过反射计连接到三个VNA测试端口中的两个的第一信号源。 第二信号源通过第三反射计提供到第三测试端口的连接,以使得能够进行全向量误差校正的3端口S参数测量。 两个信号源,以及以非比例模式操作的VNA的软件配置提供了测量二次和三阶截距测量。 两个信号源和软件还使得VNA可用于对混频器进行频率转换测量,包括精确的频率转换组延迟测量。 VNA还包括确定DUT噪声系数的组件,并提供自动校准。 VNA还提供了一种用于谐波测量精度提高的过程,并且包括双模多源/ LO模块,以提供共模噪声抑制和快速测量速度。