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    用于无线本地环路的无线电频率测试单元

    公开(公告)号:KR100256962B1

    公开(公告)日:2000-05-15

    申请号:KR1019970079001

    申请日:1997-12-30

    Inventor: 박상조

    Abstract: PURPOSE: An apparatus for testing a radio frequency unit in a WLL(Wireless Local Loop) is provided to add a function for controlling a frequency bandwidth to a CDMA wave form generator which is used in a PCS(Personal Communication Services) or a DCS(Digital Communication Service) system, and then apply the wave form generator to the WLL. CONSTITUTION: A multiplexor(210) selects one of the clocks applied from internal clock oscillators(201-203) and an external clock supply part(204). A counter(220) counts the clock selected by the multiplexor(210). ROMs(230,235) output the data having an address that corresponds to an output from the counter(220). A D/A converter(250) converts digital signals from the ROMs(230,235) to an analog signal(I). A FIFO(First Input First Output)(240) delays the data signals output from the ROMs(230,235) by one clock. A D/A converter(255) converts the digital signals from the FIFO(240) to an analog signal(Q). Amplifiers(260,265) amplify the signals(I,Q). Filters(270,275) remove undesired wave from the amplified signals(1,Q).

    Abstract translation: 目的:提供一种用于测试WLL(无线本地环路)中的射频单元的装置,用于将用于控制频率带宽的功能添加到用于PCS(个人通信服务)或DCS( 数字通信服务)系统,然后将波形发生器应用于WLL。 构成:多路复用器(210)选择从内部时钟振荡器(201-203)和外部时钟提供部件(204)施加的时钟之一。 计数器(220)对由多路复用器(210)选择的时钟进行计数。 ROM(230,235)输出具有与来自计数器(220)的输出相对应的地址的数据。 D / A转换器(250)将来自ROM(230,235)的数字信号转换为模拟信号(I)。 FIFO(第一输入第一输出)(240)将从ROM(230,235)输出的数据信号延迟一个时钟。 D / A转换器(255)将来自FIFO(240)的数字信号转换为模拟信号(Q)。 放大器(260,265)放大信号(I,Q)。 滤波器(270,275)从放大的信号(1,Q)中去除不需要的波。

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