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    Bandswitchable double tuned RF circuit with balanced secondary
    2.
    发明授权
    Bandswitchable double tuned RF circuit with balanced secondary 失效
    带平衡二次的带开关双调谐RF电路

    公开(公告)号：US5499056A

    公开(公告)日：1996-03-12

    申请号：US287521

    申请日：1994-08-08

    Applicant: Michael A. Pugel

    Inventor： Michael A. Pugel

    IPC: H04N5/44 ,  H03J3/28 ,  H03J5/24 ,  H03J5/02

    CPC classification number: H03J5/244

    Abstract: A band switchable double tuned circuit having a balanced secondary is presented. A primary tunable tank circuit with a plurality of first inductances is tuned to a first frequency by a first capacitor coupled in parallel with the first inductances. A secondary tank circuit with a plurality of second inductances inductively coupled to ones of the first inductances has a second capacitor coupled in parallel with the second inductances for tuning the secondary to the first frequency. The DC reference potential for the secondary circuit is coupled to a nodal junction of the plurality of second inductances with the secondary tank circuit providing a balanced signal output. At least one of the plurality of first inductances and the second inductances are switchable for bandswitching the tuning of the primary and secondary tank circuits to a second frequency. The output signal from the balanced secondary is coupled to the input of a balanced mixer via constant bandwidth inductances without a mixer input balance transformer.

    Abstract translation: 提出了一种具有平衡次级的频带可切换双调谐电路。 通过与第一电感并联耦合的第一电容器将具有多个第一电感的初级可调谐振荡电路调谐到第一频率。 具有与第一电感中的一个感应耦合的多个第二电感的次级电路具有与第二电感并联耦合的第二电容器，用于将次级调谐到第一频率。 次级电路的直流参考电位耦合到多个第二电感的节点与辅助电路提供平衡的信号输出。 多个第一电感和第二电感中的至少一个可切换，用于将主电池和次级电路的调谐切换到第二频率。 来自平衡二次的输出信号通过恒定带宽电感耦合到平衡混频器的输入，而无需混频器输入平衡变压器。

    Tuning control for multiple electronically tuned circuits
    3.
    发明授权
    Tuning control for multiple electronically tuned circuits 失效
    多电子调谐电路的调谐控制

    公开(公告)号：US3617899A

    公开(公告)日：1971-11-02

    申请号：US3617899D

    申请日：1969-01-15

    Applicant: MOTOROLA INC

    Inventor： GONCHAROFF NIKOLAI ,  JABBAR KAMIL Y

    IPC: H03J3/18 ,  H03J3/28 ,  H03J3/32 ,  H04B1/16

    CPC classification number: H03J3/185 ,  H03J3/28

    Abstract: Simultaneous tuning and tracking of the tuned circuits in a radio receiver using electronically tuned voltage variable capacitors in the tuned circuits of the receiver is accomplished by providing a regulated DC supply across a four-arm bridge circuit, three arms of which constitute resistive elements and the fourth arm of which is a Zener diode. The diagonal of the bridge includes a potentiometer, the tap of which provides a variable tuning voltage which is applied to one terminal of the voltage variable capacitors in each of the tuned circuits. In order to provide tracking of the tuned circuits to different frequencies, the other terminal of the voltage variable capacitors in each of the circuits is provided with different DC reference potentials, so that the circuits are tuned together to provide tracking with a predetermined offset.

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