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    • 1. 发明公开
    • 튜너의 밴드 선택회로
    • 选择调谐带的电路
    • KR1020080062410A
    • 2008-07-03
    • KR1020060138192
    • 2006-12-29
    • 엘지이노텍 주식회사
    • 최명재
    • H04N5/50H04N5/44
    • H04N5/50H03J1/06H03J5/242
    • A band-selecting circuit of a tuner is provided to dispense with separate switching diodes for selecting bands, thereby simplifying the constitution of the band-selecting circuit. A band-selecting circuit comprises an MOPLL(Mixer Oscillator Phase Locked Loop) IC(20) and first and second field effect transistors(FET1,FET2). The MOPLL IC selects respective bands for signals of at least two bands. The first and second field effect transistors receive high frequency band signals while the field effect transistors are driven according to selection of bands by the MOPLL IC. The MOPLL IC has a band selection terminal. The band selection terminal is connected to a gate terminal of the second field effect transistor and a source terminal of the first effect transistor while the band selection terminal is connected to a power voltage and a voltage through a pull-up resistor. A gate terminal of the first field effect transistor is connected to the power voltage.
    • 提供调谐器的频带选择电路以省去用于选择频带的单独的开关二极管,从而简化了频带选择电路的结构。 带选择电路包括MOPLL(混频器振荡器锁相环)IC(20)和第一和第二场效应晶体管(FET1,FET2)。 MOPLL IC为至少两个频带的信号选择各个频带。 第一和第二场效应晶体管接收高频带信号,同时根据MOPLL IC的频带选择来驱动场效应晶体管。 MOPLL IC具有选通端子。 带选择端子连接到第二场效应晶体管的栅极端子和第一效应晶体管的源极端子,而带选择端子通过上拉电阻器连接到电源电压和电压。 第一场效应晶体管的栅极端子连接到电源电压。
    • 4. 发明授权
    • 버퍼용 고주파동조증폭기
    • 버퍼용고주파동조증폭기
    • KR100366821B1
    • 2003-01-09
    • KR1020000026900
    • 2000-05-19
    • 알프스 덴키 가부시키가이샤
    • 나카노가즈히로노우미히로키
    • H03F3/191
    • H03J5/242H03F3/191H03F2200/111H03F2200/417
    • The high frequency tuning amplifier (3) for buffer has a tuning circuit (8) consisting of a serial circuit of the first (20) and second (21) inductors connected between the output of transistor amplifying stage and the power source, a first capacitor (22) connected in parallel to the serial circuit of first and second inductors, a serial circuit of the second (23) and third (24) capacitors connected in parallel to the second inductor and a switching element (26) to which a band switch voltage is supplied, connected between the connecting point of the second and third capacitors and the reference voltage point. The turning circuit is turned to the high band frequency when the switching element is turned ON and to the low band frequency when the switching element is turned OFF.
    • 用于缓冲器的高频调谐放大器(3)具有调谐电路(8),该调谐电路由连接在晶体管放大级的输出端和电源之间的第一(20)和第二(21)电感器的串联电路组成,第一电容器 (22),并联连接到第一和第二电感器的串联电路;第二(23)和第三(24)电容器的串联电路,与第二电感器并联连接;以及开关元件(26),带开关 提供电压,连接在第二和第三电容器的连接点与参考电压点之间。 转换电路在开关元件导通时变为高频带频率,在开关元件断开时变为低频带频率。 <图像>
    • 7. 发明公开
    • 버퍼용 고주파동조증폭기
    • 用于缓冲器的高频调谐放大器
    • KR1020010007087A
    • 2001-01-26
    • KR1020000026900
    • 2000-05-19
    • 알프스 덴키 가부시키가이샤
    • 나카노가즈히로노우미히로키
    • H03F3/191
    • H03J5/242H03F3/191H03F2200/111H03F2200/417
    • PURPOSE: To provide a common high-frequency tuning amplifier for buffer which can tune selectively to a high-band frequency and a low-band frequency and has nearly the same gain characteristics and passing-band characteristics between the high-band frequency and low-band frequency. CONSTITUTION: This high-frequency tuning amplifier is equipped with a tuning circuit 8 composed of a series circuit of 1st and 2nd inductors 20 and 21 connected between the output of a transistor amplification stage 7 and a power source 12, a 1st capacitor connected in parallel to the series circuit of the 1st and 2nd inductors 20 and 21, a series circuit of 2nd and 3rd capacitors 23 and 24 connected in parallel to the 2nd inductor 20, and a switching element 26 which is connected between the connection point between the 2nd and 3rd capacitor 23 and 24 and a reference voltage point and supplied with a band switching voltage, and the tuning circuit 8 tunes to the high-band frequency when the switching element 26 is on and to the low-band frequency when it is off.
    • 目的:提供一种用于缓冲器的公共高频调谐放大器,可以选择性地调谐到高频带和低频带频率,并且在高频和低频之间具有几乎相同的增益特性和通带特性, 频带频率。 构成:该高频调谐放大器配备有由连接在晶体管放大级7的输出端与电源12之间的第1和第2电感器20,21的串联电路构成的调谐电路8,并联连接的第1电容器 对于第一和第二电感器20和21的串联电路,并联连接到第二电感器20的第二和第三电容器23和24的串联电路,以及开关元件26,其连接在第二和第二电感器20和21之间的连接点之间。 第三电容器23和24以及参考电压点并提供频带切换电压,并且当开关元件26接通时调谐电路8调谐到高频带频率,并且当关断时调谐到低频带频率。