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Subject: search.filters.subject.Communication industry

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    Design and implementation of biquad digital filter
    (2003-01-01)
    Pradabpet, C.
    ;
    Yimman, S.
    ;
    Hinjit, W.
    ;
    Chivapreecha, S.
    ;
    Dejhan, K.
    This paper presents a design and implementation of biquad digital filter based on poles-zeros placement on a unit circle of z-plane. The proposed digital filter can be given three frequency-responses as lowpass filter (LPF), highpass filter (HPF) and bandpass filter (BPF) at the same time. In the design process the Matlab program was used, for real world implementation by using TMS320C31 DSP board. The experimental results shown by the dynamic signal analyzer to indicate that the obtained frequency responses give the same results as design specifications.
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    Single-input and three-output current-mode biquadratic filters using multiple-output OMAs
    (2002-01-01)
    Tangsrirat, W.
    ;
    Unhavanich, S.
    ;
    Dumawipata, T.
    ;
    Surakampontorn, W.
    A novel circuit configuration for the realization of the single-input and three-output (SITO) current-mode biquadratic filters employing only three multiple-output operational mirrored amplifiers (OMAs) is presented. The proposed circuit can simultaneously realize lowpass, bandpass and highpass filter functions at three high-impedance outputs without changing the circuit configuration and elements. Moreover, the resultant current-mode filter provides low passive and active sensitivities, uses of only grounded passive elements and can be orthogonal tuned of the parameters at and Q-factor.