Abstract
A technique is presented to design high-order continuous-time (CT) ΔΣ modulators using noise-transferfunction (NTF) enhancement. This is achieved by coupling the quantization noise into the forward path of the CT ΔΣ modulator, using a passive CT filter. This introduces a real pole-zero pair into the NTF. Thus, the order of the NTF is increased, without affecting the signal transfer function (STF). The proposed NTF-enhancement technique is applied to a CT ΔΣ modulator with a feedforward architecture, where all feedforward paths are summed within the last integrator of the ΔΣ loop filter, thereby eliminating the need for an analog summation amplifier at the quantizer input. Behavioral simulation results confirm the improved noise-shaping and stability characteristics of the proposed feedforward CT ΔΣ modulator with NTF enhancement, compared to classical CT ΔΣ modulators.
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