A double-sampled path-coupled single-loop ΣΔ modulator using noise-shaped integrating quantizer

A single-loop delta-sigma modulator based on path-coupling and double-sampling is proposed. This modulator employs a noise-shaped integrating quantizer which by itself increases the order of noise shaping by one. The integrating quantizer used in this structure holds its quantization error at the end of the evaluation phase, and hence this voltage is available in purely analog form and eliminates the need for extra DACs. This enables to utilize local path-coupling which adds another order of noise shaping. A third order example is provided and simulated to demonstrate the efficiency of this structure.