Abstract
The conventional sigma---delta modulators, such as L-0 MASH and inter-stage feedback topology, have some main drawbacks, e.g. L-0 MASH can only be applied in single loop topology and dynamic range is its big problem, and inter-stage feedback topology only cancels nonlinear errors introducing by multi-bit DAC in the final stage, but the rest stages still contain DAC nonlinearity errors without any noise shaping which still degrade overall system performance. In this letter, an improved version of cascaded multi-bit sigma---delta modulator is proposed to overcome these problems mentioned above. Simulation results will verify the superiority of the proposed modulator.
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