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Tunable active allpass sections

Tunable active allpass sections

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Two second-order allpass circuits are described, realising a pair of complex poles (and matching zeros) by analogue simulation. The group-delay response can be made to be essentially dependent on only two network parameters whose values can be selected to ‘tune’ to a particular characteristic.

References

    1. 1)
      • R. Saal , K. Antreich . Zür Realisierung von Reaktanz-Allpass-Schatungen. Frequenz
    2. 2)
      • R.C. Foss , B.J. Green . Q factor, Q stability and gain in active filters. Electronics Letters , 99 - 100
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