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In earlier paper, a conjugate symmetric frequency response has been presented to design the variable fractional delay filter by FFT, and has been proved to associate with the windowed sinc filter. However, this earlier method has no transition band design consideration. Therefore, in this paper, the trade-off between the transition band width and Gibbs phenomenon ripples is discussed, and an improved...
In this letter, a novel tunable frequency response is proposed for variable fractional delay filter with careful consideration on conjugate symmetry. This proposed fractional delay method can be efficiently realized by FFT using the tunable fractional delay parameter. Its equivalent closed form to windowing method is derived and presented. Several comparisons to other windowing methods are also demonstrated,...
Frequency compensation of active-RC elliptic filter is enabled for the first time by employing a derivative-free architecture. In conjunction with a built-in automatic unity-gain band-width (ωu) tracking scheme, the prototype 4th-order active-RC elliptic low-pass filter (LPF) measures a digitally programmable bandwidth of 14-23 MHz, a two-tone IM3 at 6 MHz consistently better than -80 dB with a full-scale...
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