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In this paper, 3 SDM with FDPA(Feedback Delay Pass Addition) technique to improve the input range is proposed. Conventional architecture with 3 transfer function is just made as adding a digital delay path in 2 SDM architecture. But the input range is very small because feedback path into the first integrator is increased. But, proposed architecture change feedback path into the first integrator to the second integrator, so input range could be improved about 9dB. The 3 SC SDM with only one operational amplifier was implemented using double-sampling technique. Simulation results for the proposed SDM designed in 0.18μm CMOS technology with power supply voltage 1.8V, signal bandwidth 20KHz and audible sampling frequency 2.8224MHz show SNR(Signal to Noise Ratio) of 83.8dB, the power consumption of 700μW and Dynamic Range of 82.8dB.

3rdSDM with FDPA Technique to Improve the Input Range

3^rdSDM with FDPA Technique to Improve the Input Range