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Towards the perfect decimator

Hejn K.

Prace Przemysłowego Instytutu Elektroniki

1998

nr 132

26-33

In this paper a two-phase recursive all-pass network for sampling-rate reduction is presented in which efficiency is achieved by simple binary scaling coefficients and by performing all necessary processing at the half sampling rate. This . network is formed as a sum of two parallel all-pass subf liters with phase shifts selected to add constructively in the passband and destructively in the stop band. The proposed structures offer very desirable properties in comparison to most published sigma-delta implementations which use a blend of simple comb filtering and decimated FIR filters for the post-modulator decimation filtering.