Radio architecture with dual frequency source selection
    1.
    发明授权
    Radio architecture with dual frequency source selection 失效
    无线电架构采用双频源选择

    公开(公告)号:US5465409A

    公开(公告)日:1995-11-07

    申请号:US206704

    申请日:1994-03-07

    CPC分类号: H04B1/005 H04B1/406

    摘要: A radio having two architectural platforms integrated in one integrated circuit (IC). A synthesizer controller (312) selects between an offset local oscillator (LO) synthesizer (318) and a second LO synthesizer (316) to provide a common architecture for either an Frequency Division Duplex (FDD) or Time Division Duplex (TDD) system design while providing isolation between the two frequency sources. An offset LO signal (319) is translated to an isolated LO signal 310 and combined with a main LO signal (322) to provide the FDD platform. A second LO signal (314) is translated into the isolated LO signal 310 and combined with the main LO signal (322) to provide the TDD platform. The second LO synthesizer signal (314) is common to both systems in the receive mode.

    摘要翻译: 具有集成在一个集成电路(IC)中的两个架构平台的无线电。 合成器控制器(312)在偏移本地振荡器(LO)合成器(318)和第二LO合成器(316)之间进行选择,以提供用于频分双工(FDD)或时分双工(TDD)系统设计的公共架构 同时提供两个频率源之间的隔离。 偏移LO信号(319)被转换为隔离LO信号310并与主LO信号(322)组合以提供FDD平台。 第二LO信号(314)被转换为隔离的LO信号310并与主LO信号(322)组合以提供TDD平台。 第二LO合成器信号(314)在接收模式下对于两个系统是公共的。

    Temperature compensation of a crystal reference using direct digital
synthesis
    2.
    发明授权
    Temperature compensation of a crystal reference using direct digital synthesis 失效
    使用直接数字合成的晶体参考温度补偿

    公开(公告)号:US5216389A

    公开(公告)日:1993-06-01

    申请号:US828829

    申请日:1992-01-31

    IPC分类号: G06F1/03 H03L1/02 H03L7/18

    摘要: Certain operational characteristics of a crystal (104) are measured during a testing and grading process. Once determined, information representing these operational characteristics are stored in memory (120) and utilized by a controller (122) to increment a phase increment register (114) upon determining the crystals ambient temperature via a temperature sensing circuit (124). The value stored in the phase increment register (114) is then sent to a phase accumulator (116) where successive phase increments are summed together. This summed value is in turn sent to a sine lookup table (118) where the instantaneous phase value is converted into sine amplitude. Finally, a digital to analog converter (126) converts the amplitude bit stream into an analog signal for use as a reference oscillator frequency having extremely high frequency resolution. The above mentioned process is repeated every clock cycle until a complete sine wave is produced at which point the phase accumulator is reset to zero and the process begins again.

    摘要翻译: 在测试和分级过程中测量晶体(104)的某些操作特性。 一旦确定,表示这些操作特性的信息被存储在存储器(120)中,并由控制器(122)利用,以在通过温度检测电路(124)确定晶体环境温度之后递增相位增量寄存器(114)。 存储在相位增量寄存器(114)中的值然后被发送到相位累加器(116),其中连续的相位增量被相加在一起。 该总和值又被发送到正弦查找表(118),其中瞬时相位值被转换成正弦幅度。 最后,数模转换器(126)将振幅比特流转换为模拟信号,以用作具有极高频率分辨率的参考振荡器频率。 每个时钟周期重复上述过程,直到产生完整的正弦波,在该点将相位累加器复位到零,并且该过程再次开始。

    Radio with fast lock phase-locked loop
    3.
    发明授权
    Radio with fast lock phase-locked loop 失效
    无线电与快速锁相环路

    公开(公告)号:US5175729A

    公开(公告)日:1992-12-29

    申请号:US710637

    申请日:1991-06-05

    IPC分类号: H03L7/107 H03L7/183 H04B1/40

    CPC分类号: H03L7/183 H03L7/107 H04B1/405

    摘要: A communication device (508) for use in a Time Division Multiplex (TDM) communication system (500) includes a transmitter, a receiver, and a frequency scanner for quickly scanning the radio frequency communication channels to determine an available channel. The communication device (508) also includes a phase locked loop (100) for providing a reference signal for the communication device (508) and locking to the available channel. This phase locked loop (100) includes a Voltage Control Oscillator (VCO) (104) having a control signal input (103). The phase locked loop (100) also includes a first filter (110) and a second filter (108). The first filter (110) has a wide frequency response. The second filter (108) includes a storage element (222) and has a narrow frequency response. The phase locked loop (100) also includes a switching circuit (106) which determines which one of the two filters (110, 108) gets coupled to the voltage control oscillator (104).

    摘要翻译: 在时分复用(TDM)通信系统(500)中使用的通信设备(508)包括用于快速扫描射频通信信道以确定可用信道的发射机,接收机和频率扫描器。 通信设备(508)还包括用于为通信设备(508)提供参考信号并锁定到可用信道的锁相环(100)。 该锁相环(100)包括具有控制信号输入(103)的电压控制振荡器(VCO)(104)。 锁相环(100)还包括第一滤波器(110)和第二滤波器(108)。 第一滤波器(110)具有宽的频率响应。 第二滤波器(108)包括存储元件(222)并且具有窄的频率响应。 锁相环(100)还包括切换电路(106),其确定两个滤波器(110,108)中的哪一个耦合到压控振荡器(104)。