Abstract
A mixed CT/DT 2-1 cascaded ΣΔM which includes a first stage CT ΣΔM and a second stage mismatch insensitive two-channel time-interleaved DT ΣΔM is proposed. With this approach, the advantages of both CT and DT ΣΔMs including high speed operation, inherent anti-aliasing filter, and good coefficient matching can be achieved. The twochannel time-interleaved ΣΔM used in the second stage alleviates the speed constraints of the DT ΣΔM, whereas enables better matching between the analog and digital filter coefficients compared to CT ΣΔMs.
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