Abstract
A hybrid continuous-time (CT)/discrete-time (DT) multi-stage noise-shaping (MASH) ΣΔ modulator architecture is presented. The double-sampling technique is employed in the DT second stage modulator. A flat and a unity signal transfer functions (STFs) are used in the first and second stage modulators, respectively, to make the modulator robust to nonlinearities of the analog circuitry and well suited for low-voltage applications without influencing the inherent anti-aliasing behavior of the first stage CT modulator. Unlike the conventional MASH architecture, this structure is insensitive to the amplifier limited DC gain of CT stage and avoids the need of compensation for finite gain-bandwidth induced error in CT loop filter. Behavioral simulations confirm the effectiveness of the proposed scheme over existing cascaded topologies.
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