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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。
    • 3. 发明公开
    • 공통 국부 발진기를 구비한 다중 대역 혼합기
    • 多通道混频器与通用本地振荡器
    • KR1020000047695A
    • 2000-07-25
    • KR1019990052056
    • 1999-11-23
    • 모토로라 솔루션즈, 인크.
    • 허포드커트스쿠타프랭크
    • H04B1/16
    • H03D7/12
    • PURPOSE: A multiple band mixer with common local oscillator is provided to increasing the number of frequency by providing additional communication signal inputs and mode control inputs. CONSTITUTION: A multiple band mixer with common local oscillator comprises a first input(311) for communication signals, a first TR(313) coupled to the first input, a second input(326) for communication signals in a second frequency band, a local oscillator(120), and a multiple band mixer output(104). The local oscillator is coupled to a second terminal of the first TR and a second terminal of the second TR. The first and second TR each include a bipolar transistor.
    • 目的:提供具有公共本地振荡器的多频带混频器,通过提供额外的通信信号输入和模式控制输入来增加频率数量。 构成:具有公共本地振荡器的多频带混频器包括用于通信信号的第一输入端(311),耦合到第一输入端的第一TR(313),用于第二频带中通信信号的第二输入端(326) 振荡器(120)和多频带混频器输出(104)。 本地振荡器耦合到第一TR的第二端子和第二TR的第二端子。 第一和第二TR各自包括双极晶体管。
    • 5. 发明公开
    • 텔레비젼 신호 수신튜너
    • 用于接收电视信号的调谐器
    • KR1020000035706A
    • 2000-06-26
    • KR1019990052869
    • 1999-11-26
    • 알프스 덴키 가부시키가이샤
    • 니시무라다카시야마모토마사요시
    • H04N5/50
    • H03D7/12
    • PURPOSE: A television signal receiving tuner is provided to increase an image quality of a television receiver by increasing an attenuation amount of an adjacent band separated from an intermediate frequency band of the television signal. CONSTITUTION: A television signal receiving tuner comprises an intermediate frequency amplifying circuit(3), an SAW filter(4) and an integration circuit(6). The integration circuit(6) comprises a mixer circuit(1) and an intermediate frequency circuit(5). The mixer circuit(1) receives a received television signal(RF) through an input terminal(1), and converts the television signal(RF) into an intermediate frequency signal(IF). The intermediate frequency amplifying circuit(3) amplifies the intermediate frequency signal(IF) provided through a terminal(8) of the integration circuit(6). The intermediate frequency signal(IF) is provided to an intermediate frequency circuit(5) of the circuit(6) through the SAW filter(4).
    • 目的:提供一种电视信号接收调谐器,通过增加与电视信号的中频带分离的相邻频带的衰减量来增加电视接收机的图像质量。 构成:电视信号接收调谐器包括中频放大电路(3),SAW滤波器(4)和积分电路(6)。 积分电路(6)包括混频器电路(1)和中频电路(5)。 混频器电路(1)通过输入端(1)接收接收到的电视信号(RF),并将电视信号(RF)转换成中频信号(IF)。 中频放大电路(3)放大通过集成电路(6)的端子(8)提供的中频信号(IF)。 中频信号(IF)通过SAW滤波器(4)提供给电路(6)的中频电路(5)。