Multi-phase filter/DAC

Pulse or digital communications – Receivers – Interference or noise reduction

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Details

375373, H04B 110

Patent

active

055219462

ABSTRACT:
Apparatus and method for use with a sampled input signal having an input sampling frequency F.sub.S. The apparatus including M digital filters, each receiving the input signal, each having a respective transfer characteristic h.sub.m [n] and each producing a respective output signal updated at the input sample rate F.sub.S, each m'th one of the filters updating its output signal in response to a respective m'th phase of the input sample clock, M.gtoreq.2. The apparatus then combines the output signals of the digital filters to produce a combined output signal having a sample rate of at least MF.sub.S. The apparatus may also be viewed as a hybrid digital/analog filter. The method includes steps of receiving the sampled input signal, filtering the sampled input signal through P filters, combining the outputs of the P filters to produce M output signals, 1<M.ltoreq.P, each m'th one of the M output signals being updated in time for respective m'th one of the phase of the input sampling frequency F.sub.S, and combining the M output signals to produce a combined output signal having a sample rate of at least MF.sub.S.

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"Analog Filter Design for Video A/D and D/A Converters", Brooktree Corporation, Application Note 35 (1993).

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