Domino free 4-path time-interleaved second order sigma-delta modulator

A domino free 4-path time-interleaved (TI) second order sigma-delta modulator is proposed. The domino effect, which is a critical limit for the circuit implementation of conventional 4-path TI sigma-delta modulators, can be eliminated by the proposed modulator output prediction method. This along with the input signal down sampling scheme enables a complete SC circuit implementation of the 4-path TI modulator with only five op-amps, using the conventional 2-phase clock control. Also, the single global feedback path of the proposed structure makes it robust to path mismatch effects compared to other TI modulators, which usually have multi-path global feedbacks.