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    Mixer amplifier and radiofrequency front-end circuit
    3.
    发明授权
    Mixer amplifier and radiofrequency front-end circuit 有权
    混频器放大器和射频前端电路

    公开(公告)号：US07554381B2

    公开(公告)日：2009-06-30

    申请号：US11818903

    申请日：2007-06-15

    Applicant: Didier Belot ,  Francesco Svelto ,  Marco Sosio ,  Massimo Brandolini

    Inventor： Didier Belot ,  Francesco Svelto ,  Marco Sosio ,  Massimo Brandolini

    IPC: G06F7/44

    CPC classification number: H03D7/1441 ,  H03D7/1458 ,  H03D7/1483 ,  H03D7/1491

    Abstract: The mixer amplifier includes an amplification stage having a current source circuit and a plug filter adapted to modify the current circulating in the current source circuit. The amplification stage and a mixer stage amplify an incoming signal and transpose the frequency of the signal to a predetermined frequency. Resistors pairs measure the imbalance between two branches and have a relatively high value (thus creating a high-pass filter). When the branches are perfectly balanced, the voltage tapped by the non-inverting terminal of the operational amplifier A is zero. During an imbalance, this voltage rises. The output of the amplifier drives the TNP transistor T9, causing current to flow into branches to solicit the transistors T7 or T8 of the current source circuits and thus return the two branches to balance. Accordingly, a balance is maintained between the two branches by providing a feedback within the mixer amplifier.

    Abstract translation: 混频器放大器包括具有电流源电路和适于修改在电流源电路中循环的电流的插头滤波器的放大级。 放大级和混频器级放大输入信号并将信号的频率转换到预定频率。 电阻对测量两个分支之间的不平衡，并具有相对较高的值（从而创建高通滤波器）。 当分支完全平衡时，运算放大器A的同相端子抽头的电压为零。 在不平衡状态下，电压上升。 放大器的输出驱动TNP晶体管T9，导致电流流入分支以吸引电流源电路的晶体管T7或T8，从而使两个分支返回平衡。 因此，通过在混频放大器内提供反馈来在两个分支之间保持平衡。

    Multi-Tuner Variable Low IF Receiver for Multi-Channel Applications
    5.
    发明申请
    Multi-Tuner Variable Low IF Receiver for Multi-Channel Applications 有权
    用于多通道应用的多调谐器可变低中频接收器

    公开(公告)号：US20100066917A1

    公开(公告)日：2010-03-18

    申请号：US12553701

    申请日：2009-09-03

    Applicant: Francesco Gatta ,  Ramon Gomez ,  Leonard Dauphinee ,  Young Joon Shin ,  Hanli Zou ,  Massimo Brandolini ,  Giuseppe Cusmai

    Inventor： Francesco Gatta ,  Ramon Gomez ,  Leonard Dauphinee ,  Young Joon Shin ,  Hanli Zou ,  Massimo Brandolini ,  Giuseppe Cusmai

    IPC: H04N5/50 ,  H04B1/26

    CPC classification number: H04N5/455 ,  H04N5/45 ,  H04N21/4263 ,  H04N21/4382

    Abstract: Systems and methods for demodulating a plurality of contiguous channels contained within a bandlimited portion of a radio-frequency (RF) input signal are provided. In an embodiment, the bandlimited portion of the RF input signal is down-converted to baseband. After down-conversion, the bandlimited portion overlaps at baseband with a mirror image of the bandlimited portion. The plurality of contiguous channels within the down-converted signal similarly overlap at baseband and subsequently occupy a bandwidth substantially equal to half that required before down-converting. Image rejection is performed in the digital domain to recover each of the plurality of overlapping channels.

    Abstract translation: 提供了用于解调包含在射频（RF）输入信号的频带限制部分内的多个连续信道的系统和方法。 在一个实施例中，RF输入信号的频带限制部分被下变频为基带。 在下转换之后，频带限制部分与带限制部分的镜像重叠在基带处。 下变频信号内的多个相邻信道类似地在基带处重叠，并且随后占据基本上等于下变频所需的一半的带宽。 在数字域中进行图像抑制以恢复多个重叠信道中的每一个。

    Mixer amplifier and radiofrequency front-end circuit
    6.
    发明申请
    Mixer amplifier and radiofrequency front-end circuit 有权
    混频器放大器和射频前端电路

    公开(公告)号：US20080042726A1

    公开(公告)日：2008-02-21

    申请号：US11818903

    申请日：2007-06-15

    Applicant: Didier Belot ,  Francesco Svelto ,  Marco Sosio ,  Massimo Brandolini

    Inventor： Didier Belot ,  Francesco Svelto ,  Marco Sosio ,  Massimo Brandolini

    IPC: G06G7/16

    CPC classification number: H03D7/1441 ,  H03D7/1458 ,  H03D7/1483 ,  H03D7/1491

    Abstract: The mixer amplifier includes an amplification stage having a current source circuit and a plug filter adapted to modify the current circulating in the current source circuit. The amplification stage and a mixer stage amplify an incoming signal and transpose the frequency of the signal to a predetermined frequency. Resistors pairs measure the imbalance between two branches and have a relatively high value (thus creating a high-pass filter). When the branches are perfectly balanced, the voltage tapped by the non-inverting terminal of the operational amplifier A is zero. During an imbalance, this voltage rises. The output of the amplifier drives the TNP transistor T9, causing current to flow into branches to solicit the transistors T7 or T8 of the current source circuits and thus return the two branches to balance. Accordingly, a balance is maintained between the two branches by providing a feedback within the mixer amplifier.

    Abstract translation: 混频器放大器包括具有电流源电路和适于修改在电流源电路中循环的电流的插头滤波器的放大级。 放大级和混频器级放大输入信号并将信号的频率转换到预定频率。 电阻对测量两个分支之间的不平衡，并具有相对较高的值（从而创建高通滤波器）。 当分支完全平衡时，运算放大器A的同相端子抽头的电压为零。 在不平衡状态下，电压上升。 放大器的输出驱动TNP晶体管T9，使电流流入分支以吸引电流源电路的晶体管T 7或T 8，从而使两个分支返回平衡。 因此，通过在混频放大器内提供反馈来在两个分支之间保持平衡。

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