並列T形RC回路網と演算増幅器を用いた双2次フィルタの素子感度

概要

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Sensitivirity concideration of a biquad filter using an RC Twin-T network and an operational amplifier is presented. Notch depth and Q sensitivities are strongly dependent on the location of a canceled pole-zero. Pair usually the value of Q-sensitivity is very large and proportional to the value of Q in the case that the normalized value of the first order cancelling pole-zero pair is unity. However if we property choose the location of the polezero pair on negative real axis, the values of Q and Notch depth sensitivities will decrease. However disadvantages will come out in this case, i. e. the effect of limited gain-band width product to the frequncy response increase and the sqread of element values will became wider. The sensitivity of a biquad filter using unity-gain amplifier is also investigated.
東海大学の論文