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    • 2. 发明公开
    • 무선 주파수 튜너
    • 无线电频道调谐器
    • KR1020020044546A
    • 2002-06-15
    • KR1020010076599
    • 2001-12-05
    • 자알링크 세미컨덕터 리미티드
    • 코울리니콜라스폴트로드랜스
    • H04N7/10
    • H03J1/0008H03D7/12H03L7/0802
    • PURPOSE: A radio frequency tuner is provided to reduce power consumption, and to optimize automatically or manually by selecting channels from a cable distribution network or other receiving systems. CONSTITUTION: A radio frequency tuner has one or more stages(3,8,13) whose performance, such as signal to noise plus intermodulation, and gain are functions of the stage power consumption. A comparator(35) compares the tuner performance, such as a bit error rate estimator(34), with the predetermined performance. When the tuner performance exceeds the predetermined performance, a power consumption control circuit reduces the power consumption of the stages to reduce the tuner power consumption while maintaining acceptable tuner performance. The control circuit has input presetting power consumption according to tuner application, and controls variable gain units to compensate gain changes from fluctuation of power consumption.
    • 目的:提供射频调谐器以降低功耗,并通过从电缆分配网络或其他接收系统中选择频道来自动或手动进行优化。 规定:射频调谐器具有一个或多个级(3,8,13),其性能如信噪比加互调和增益是功率级的功能。 比较器(35)将诸如误码率估计器(34)的调谐器性能与预定性能进行比较。 当调谐器性能超过预定性能时,功耗控制电路降低了各级的功耗,从而降低了调谐器功耗,同时保持了可接受的调谐器性能。 控制电路根据调谐器应用具有输入预设功耗,并控制可变增益单元,以补偿由功耗波动引起的增益变化。