A novel noise transfer function for high order reduced-sample-rate delta-sigma-pipeline ADCs

A novel noise transfer function (NTF) for high order reduced-sample-rate mixed-delta-sigma-pipeline ADCs is presented. The proposed NTF determines the location of the non-zero poles improving the stabilization of the loop and implementing reduced-sample-rate architecture, concurrently. A design methodology based on simulated-annealing-algorithm is developed to design the optimum NTF. To verify the usefulness of the proposed NTF and design procedure, two different modulators are introduced. Simulation results show that with a 4th order modulator, designed making use of the proposed approach, the maximum SNDR of 114.9dB and 122.5dB can be achieved with only OSR of 8, and 16 respectively.