Tunable tracking filter
    2.
    发明申请
    Tunable tracking filter 有权
    可调谐跟踪滤波器

    公开(公告)号:US20060072276A1

    公开(公告)日:2006-04-06

    申请号:US10538372

    申请日:2003-11-27

    IPC分类号: H02H1/00

    CPC分类号: H03J1/0041 H03J3/08

    摘要: An integrated tuner circuit (20) with an arbitrary IF output. The tuner includes an integrated circuit with a fixed-frequency control loop (30) and a matched external variable capacitance Ct, to achieve tracking of a tuned LC band-pass filter (10) with an arbitrary oscillator.

    摘要翻译: 具有任意IF输出的集成调谐器电路(20)。 调谐器包括具有固定频率控制回路(30)和匹配的外部可变电容C 的集成电路,以实现具有任意振荡器的调谐LC带通滤波器(10)的跟踪 。

    Analog-to-digital-converting and suppressing system
    3.
    发明申请
    Analog-to-digital-converting and suppressing system 有权
    模数转换和抑制系统

    公开(公告)号:US20070080840A1

    公开(公告)日:2007-04-12

    申请号:US10576551

    申请日:2004-10-08

    IPC分类号: H03M1/12

    CPC分类号: H03M1/0626 H03M1/12

    摘要: Systems (20, 22) with analog-to-digital-converters (5), for use in receivers (30) comprising tuners (31) and channel decoders (32), comprise analog filters (1, 2) located before the analog-to-digital-converters (5). The analog filters (1, 2) at least partly suppress the analog wanted signal and the analog unwanted signal. Compensators (3, 4) compensate the digital output signal of the analog-to-digital-converters (5) for the at least partly suppressing of the analog wanted signal. As a result, the analog unwanted signal in an adjacent channel could now be suppressed better than before, at the cost of also partly suppressing the analog wanted signal in a wanted channel. The compensators (3, 4) restore the wanted signal.

    摘要翻译: 具有模数转换器(5)的系统(20,22),用于包括调谐器(31)和通道解码器(32)的接收器(30)中,包括模拟滤波器(1,2) 数字转换器(5)。 模拟滤波器(1,2)至少部分地抑制模拟有用信号和模拟不需要的信号。 补偿器(3,4)补偿模数转换器(5)的数字输出信号,用于至少部分地抑制模拟有用信号。 结果,现在可以比以前更好地抑制相邻信道中的模拟不需要信号,其代价是部分抑制所需信道中的模拟有用信号。 补偿器(3,4)恢复有用信号。