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    • 29. 发明授权
    • Polar leapfrog filter
    • 极地跨越过滤器
    • US5293086A
    • 1994-03-08
    • US858063
    • 1992-03-26
    • Hiroshi TanigawaHiroshi KondoTsuneo TohyamaIsao Fukai
    • Hiroshi TanigawaHiroshi KondoTsuneo TohyamaIsao Fukai
    • H03H11/12H03H11/04H03F3/64H03F1/34
    • H03H11/0466H03H11/045
    • A polar leapfrog filter includes at least one polar network. The polar network comprises a differentiator constituted by an operational amplifier having input and output terminals, and a first integrator formed by a first capacitor for providing negative feedback to the operational amplifier and a first variable transconductance amplifier; and a second integrator formed by a second capacitor for providing negative feedback to the first integrator, and a second variable transconductance amplifier. An integrator is provided at each of the input and output stages, and a third integrator is provided immediately preceding the output side integrator. In the case where two or more said polar networks are incorporated, an additional integrator is provided between the polar networks. The total number of all the circuits is selected to be even and equal to the order of the filter. The adjacent ones of the circuits are connected in such a manner that leapfrog type negative feedback is effected, and only the input side integrator is constructed in the form of self negative feedback type.
    • 极地跨越式过滤器包括至少一个极性网络。 极性网络包括由具有输入和输出端子的运算放大器构成的微分器和由用于向运算放大器提供负反馈的第一电容器和由第一可变跨导放大器形成的第一积分器; 以及由用于向第一积分器提供负反馈的第二电容器形成的第二积分器和第二可变跨导放大器。 在每个输入和输出级提供积分器,并且在输出侧积分器之前提供第三积分器。 在并入两个或更多个所述极性网络的情况下,在极性网络之间提供附加积分器。 所有电路的总数选择为均匀且等于滤波器的顺序。 相邻的电路以跨越式负反馈的方式连接,只有输入侧积分器构成自负反馈型的形式。