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