Improved unity-STF sturdy MASH ΣΔ modulator for low-power wideband applications


A novel durable multi-stage noise-shaping sigma–delta modulator that cancels the primary-stage quantisation error at the output of the modulator is presented. Since any stage of the modulator has unity signal transfer operate, the modulator would be very robust to circuit non-idealities like finite op-amp gain. Furthermore, the signal processing timing issue within the critical paths of the proposed topology has been relaxed because of shifting the delay of the last integrator to the feedback path of the modulator. Moreover, this topology will be implemented in the circuit level by a fewer active blocks. So, it practically would be appropriate for low-voltage and low-oversampling applications. Simulation results show the usefulness of the proposed modulator.

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