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    • 96. 发明申请
    • Circuit configuration for filtering a radio-frequency signal
    • 用于过滤射频信号的电路配置
    • US20010027093A1
    • 2001-10-04
    • US09789821
    • 2001-02-20
    • Erwin Krug
    • H04B001/06
    • H03H7/12H03H7/1708H03H7/1725H03H7/175H03J3/08
    • A circuit configuration for filtering a radio-frequency signal, in particular, in tuners for television sets, includes a control signal connection for feeding in a control signal, a controllable-frequency oscillator, at least one filter having an adjustable passband for a useful signal, and a device for providing a correction signal. The filters are, preferably, tracking filters whose filter band can be shifted by a control signal. At least one filter has a variable-frequency element with a first connection and a second connection. The first connection is coupled to the control signal connection, and the correction signal device is coupled to the second connection. For fine tuning production tolerances, the filters are supplied with a correction signal, which is applied to the other pole of the variable-frequency element of the filter as compared with the control signal. The value range of the correction signals is limited to the correction range and is much lower than the value range for the control signal.
    • 特别是用于电视机的调谐器中的用于过滤射频信号的电路结构包括用于馈送控制信号的控制信号连接,可控频率振荡器,至少一个具有用于可用信号的可调节通带的滤波器 以及用于提供校正信号的装置。 滤波器优选地是其滤波器频带可以通过控制信号偏移的跟踪滤波器。 至少一个滤波器具有具有第一连接和第二连接的可变频率元件。 第一连接耦合到控制信号连接,并且校正信号装置耦合到第二连接。 对于微调生产公差,滤波器被提供有与控制信号相比被施加到滤波器的可变频率元件的另一极的校正信号。 校正信号的值范围被限制到校正范围,并且远低于控制信号的值范围。
    • 99. 发明授权
    • Satellite broadcasting receiving tuner
    • 卫星广播接收调谐器
    • US5963842A
    • 1999-10-05
    • US758133
    • 1996-11-25
    • Toshimitsu Kinugawa
    • Toshimitsu Kinugawa
    • H04B1/10H03H7/12H03J3/18H03J3/26H04B1/18H04B1/26H04N7/20H04N5/50
    • H04N5/4446H03H7/12H03J3/185H03J3/26H04B1/0092H04B1/26H04N7/20
    • A satellite broadcasting receiving tuner having a band-pass filter capable of adequately attenuating and removing disturbing wave components having frequencies in the vicinity of 480 MHz and capable of being easily tuned to the high-end frequency. The tuner has at least the band-pass filter for transmitting a down-converted received satellite broadcasting signal and a frequency converter section for converting the received satellite broadcasting signal transmitted through the band-pass filter into a signal having an intermediate frequency. The band-pass filter has a first variable tuning circuit formed of two inductors connected in series and a variable capacitance element branching off from this series connection, a second variable tuning circuit also formed of two inductors connected in series and a variable capacitance element branching off from this series connection, and a trap element connected to a point of connection of the first and second variable tuning circuits to effect selective attenuation at the intermediate frequency. The trap element is a chip capacitor and inductors are strip lines.
    • 一种具有带通滤波器的卫星广播接收调谐器,其能够适当地衰减并去除具有在480MHz附近的频率并且能够容易地调谐到高端频率的干扰波分量。 调谐器至少具有用于发送下变频的接收卫星广播信号的带通滤波器和用于将通过带通滤波器发送的接收的卫星广播信号转换成具有中频的信号的频率转换器部分。 带通滤波器具有由串联连接的两个电感器和从该串联连接分支的可变电容元件形成的第一可变调谐电路,也由两个串联连接的电感器形成的第二可变调谐电路和分支的可变电容元件 并且连接到第一和第二可变调谐电路的连接点的陷波元件以在中频处实现选择性衰减。 陷阱元件是片式电容器,电感器是带状线。
    • 100. 发明授权
    • Electronic-tuning type radio-frequency tuning circuit
    • 电子调谐型射频调谐电路
    • US5864267A
    • 1999-01-26
    • US779242
    • 1997-01-03
    • Shigeru HatadaMasami Osawa
    • Shigeru HatadaMasami Osawa
    • H04B1/10H03H7/12H03J3/20H03J3/24H03J3/32H03J3/00H03H7/09
    • H03J3/32H03H7/12H03H7/1775
    • A radio-frequency tuning circuit includes an input tuning transformer, and an output tuning transformer. The input tuning transformer comprises a primary coil adapted to serve as input coil, and a secondary coil to which a pair of variable-capacitance diodes having cathodes thereof connected together are connected in parallel therewith to form a first tuning circuit. The output tuning transformer comprises a primary coil to which a variable-capacitance element is connected to form a second tuning circuit, and a secondary coil adapted to serve as output coil. The input and output tuning transformers are connected in such a manner as to form a double-tuning circuit. Q-factor of the output tuning transformer is made to be twice as high as that of the input tuning transformer, and resonant impedance of the first tuning circuit and that of the second tuning circuit are made to be substantially equal to each other.
    • 射频调谐电路包括输入调谐变压器和输出调谐变压器。 所述输入调谐变压器包括适于用作输入线圈的初级线圈和与其连接的阴极的一对可变电容二极管并联连接的二次线圈,以形成第一调谐电路。 输出调谐变压器包括连接可变电容元件以形成第二调谐电路的初级线圈和适于用作输出线圈的次级线圈。 输入和输出调谐变压器以形成双调谐电路的方式连接。 输出调谐变换器的Q因子为输入调谐变压器的两倍,第一调谐电路和第二调谐电路的谐振阻抗彼此基本相等。